Physics Unit12: Sound - 题库网 (tiku.one)

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1#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Which of the following i-/0opj q4g exowos7oik kgfw03*49ets a false statement?

A. Sound waves are longitudinal pressure waves.

B. Sound can travel through a vacuum.

C. Light travels very much faster than sound.

D. The transverse waves on a vibrating string are different from sound waves.

E. "Pitch" (in music) and frequency have approximately the same meaning.

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2#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

In general, sound is conducte0r0;-tb6i-jwa rvuqed fastest through

A. gases.

B. liquids.

C. solids.

D. a vacuum.

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3#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

What is the speed of sound in a vjq9n uq.,pyl*5qy6lsteel rod?

A. 1500 m/s

B. 3000 m/s

C. 5000 m/s

D. 8000 m/s

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4#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

As the temperature of the air increases, what hh g8bi7 uihm4ymcne)c cj;n a 8q2kn.r80+c o5appens to the velocity of sound? (Assume thcninhhqm 7 )8bcm c e8uj0;84noc rig2a5ky.+at all other factors remain constant.)

A. It increases.

B. It decreases.

C. It does not change.

D. It increases when atmospheric pressure is high and decreases when the pressure is low.

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5#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Compared to the velocity of a 400 Hz soun ookr;;zfv27:z 4 qsi7 ev;tscd, the velocity of a 200 Hz sound through air is ;ksv2r fesz v74:otc; 7iz;oq

A. twice as great.

B. the same.

C. one-half as great.

D. none of the above

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6#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Compared to the wavelength of a 400 Hz sound, the wavelength of a 200 Hz sound i5s mfh5d7 chd-n air iss7hhdf55 cm d-

A. twice as long.

B. the same.

C. one-half as long.

D. none of the above

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7#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Sound vibrations with frequencies greater than 20,000b1g4 x1 a* ozc hcvc77zv.;plp Hz are called

A. infrasonics.

B. ultrasonics.

C. supersonics.

D. none of the above

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8#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Sound vibrations with frec)oi9kuehf 6*q ek s)6quency less than 20 Hz are called

A. infrasonics.

B. ultrasonics.

C. supersonics.

D. none of the above

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9#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Suppose that a sound source is emitting waves uniformly in all directi :cq7bcvrf:.nons. If you move to a point twice as far away from the source, the frequency of thevrn:.cbq7 f: c sound will be

A. unchanged.

B. half as great.

C. one-fourth as great.

D. twice as great.

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10#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

For spherically diverging wa4cd11bjbls t 6o* /y79inl lpuves, intensity is proportional to

A. $R^2$

B. $R$

C. $1/R$

D. $1/R^2$

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11#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

The intensity of a point source at a distance d from the source is2a 8fr3mlv 2bx( *bhtt I. What is the intlbtfx3(8mah2 r t v2*bensity at a distance 2d from the source?

A. $4 \; I$

B. $2 \; I$

C. $I/2$

D. $I/4$

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12#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

You double your distance fsc3v 0dwo c9zjvhk.94 f au.0i :cln+rrom a sound source that is radiating equally in all directions. What happens to the intensity of thckcl9r 0o+ 0ivzhas. jf4.dwv:9 ncu3e sound? It reduces to

A. one-half its original value.

B. one-fourth its original value.

C. one-sixteenth its original value.

D. none of the above

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13#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

You double your distance from a sound source that is radiating equally in all di f5teu;lvo 29prections. What happens to the intensity level of the souvf2;9pleto 5und? It drops by

A. 2 dB

B. 3 dB

C. 6 dB

D. 8 dB

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14#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Which of the following increases as a sound becomes lqc nhpo: c)qhjbg;*h7; r, qv6ouder?

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15#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

You move slowly toward a speaker emitting a pure tone. 3 r*71ht .jpppo*xt ay What characteristic of the sound t7ah3yrtop *1xp p*. jincreases?

A. frequency

B. amplitude

C. wavelength

D. period

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16#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

What determines "loudness" of a musicairulgoi60c y.cn 5:8bl note?

A. frequency

B. velocity

C. phase

D. amplitude

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17#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

What determines the "pitch" of a f9 x blmms6b-ckg-6l: musical note?

A. amplitude

B. wavelength

C. frequency

D. phase

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18#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

When sound passes frt) eha wxo8l4:om air into water

A. its wavelength does not change.

B. its frequency does not change.

C. its velocity does not change.

D. all of the above

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19#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Pressure and displacement waves p49ssn s.po6,di mn6l(vy g0mare

A. in phase.

B. $45^{\circ}$ out of phase.

C. $90^{\circ}$ out of phase.

D. $180^{\circ}$ out of phase.

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20#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Consider the standing wave on a guitar string and the sounl08m m,2l wwbhd wave generated by the guitar as a result of this vibratiowmlm w8b0h,l 2n. What do these two waves have in common?

A. They have the same wavelength.

B. They have the same velocity.

C. They have the same frequency.

D. More than one of the above is true.

E. None of the above is true.

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21#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

In a resonating pipe which is open at both ends, m9 ac6 :g/g3wcwft0iythere

A. are displacement nodes at each end.

B. are displacement antinodes at each end.

C. is a displacement node at one end and a displacement antinode at the other end.

D. none of the above

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22#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Consider an open pipe of length L. What are the wavelengths of thel /n /g*y67t6pw v2widl6 se9:fw8cby xgd*u t three lowest tones prodepgyd*ni t6t /*lg9w/ 7 yv8d2:bfw ws6xcul6uced by this pipe?

A. 4L, 2L, L

B. 2L, L, L/2

C. 2L, L, 2L/3

D. 4L, 4L/3, 4L/5

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23#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

The lowest tone to resonate huw/v6( h6 .rtdkuvob4qxdx0-k 5e d.in an open pipe of length L is 200 Hz. Which one of the following frequencies tb 0(d ku k/46e.x u. -hdvohwdxr6v5qwill not resonate in the same pipe?

A. $400 \; Hz$

B. $600 \; Hz$

C. $800 \; Hz$

D. $900 \; Hz$

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24#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An open pipe of length L is resonating at its fundamen/eo108h wm dqdtal frequency. Which statem e doq1w80d/mhent is correct?

A. The wavelength is 2L and there is a displacement node at the pipe's midpoint.

B. The wavelength is 2L and there is a displacement antinode at the pipe's midpoint.

C. The wavelength is L and there is a displacement node at the pipe's midpoint.

D. The wavelength is L and there is a displacement antinode at the pipe's midpoint.

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25#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

In a resonating pipe which is open at one end and closed at the other, theret3,+a*/lj i yfz+osi. jrac2c bk9:gh

A. are displacement nodes at each end.

B. are displacement antinodes at each end.

C. is a displacement node at the open end and a displacement antinode at the closed end.

D. is a displacement node at the closed end and a displacement antinode at the open end.

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26#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Consider a closed pipe of length L.o/ 31+4xjdtjlx (nlcj What are the wavelengths of the three lowest tones produced by this3jjct+4 jon x xl/(ld1 pipe?

A. 4L, 2L, L

B. 2L, L, L/2

C. 2L, L, 2L/3

D. 4L, 4L/3, 4L/5

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27#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

The lowest tone to resonate in a closed pipe of length L)bl z6mf pje;mztq.40 is 200 Hz. Which of the following frequencies will not resonate in that mtbzmpl40;.qj6)e fzpipe?

A. $400 \; Hz$

B. $600 \; Hz$

C. $1000 \; Hz$

D. $1400 \; Hz$

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28#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A pipe of length L closed at one end is resoc-drx ; e2vws4nating at its fundamental frequency. Which statewrcvs;d 2xe 4-ment is correct?

A. The wavelength is 4L and there is a displacement node at the pipe's open end.

B. The wavelength is 4L and there is a displacement antinode at the pipe's open end.

C. The wavelength is L and there is a displacement node at the pipe's open end.

D. The wavelength is L and there is a displacement antinode at the pipe's open end.

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29#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A person stands between+z u2r(*qz(khxmbg;/lz 38he- izp p e two speakers driven by the same source. Each speaker produces a tone with a frequency of 200 Hz on a day when the speed of sound i;/ z qbek lz8zp i3rm*e h+(upxzhg(-2s 330 m/s. The person is
1.65 m from one speaker and 4.95 m from the other. What type of interference does the person sense?

A. constructive

B. destructive

C. both constructive and destructive

D. neither constructive nor destructive

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30#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

In order to produce beats, the two solctg hh b4uh9f-n 92s1und waves should have

A. the same amplitude.

B. slightly different amplitudes.

C. the same frequency.

D. slightly different frequencies.

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31#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Two pure tones are sounded together and a plsrtwyu2b swug4-02 3articular beat frequency is heard. What happens to the beat frequency if the freq4 2rbultuy s20ww-g3suency of one of the tones is increased?

A. It increases.

B. It decreases.

C. It does not change.

D. It could either increase or decrease.

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32#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

The Doppler shift explain2w64f zword: 3rtxg r(s

A. why the siren on a police car changes its pitch as it races past us.

B. why a sound grows quieter as we move away from the source.

C. how sonar works.

D. the phenomenon of beats.

E. why it is that our hearing is best near 3000 Hz.

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33#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A sound source approaches a statf/hfb)2 7yhpho k *hk8ionary observer. The frequency heard by the observer ip/k7h fbh k8hfhy)2o* s

A. higher than the source.

B. lower than the source.

C. the same as that of the source.

D. equal to zero.

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34#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A sound source departs from a stationary observer. The m* d6czv/si 1tfrequency heard by the observ zdt1*v/ms ic6er is

A. higher than the source.

B. lower than the source.

C. the same as that of the source.

D. equal to zero.

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35#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

If a jet plane were to double its MACH-speed, its half-angle will de1msysd vi, hl;ep*77 pcrease by a factor of:y1 v* lp,d77ishsm ep;

A. 1/2

B. 2

C. $\sin^{-1} (1/2)$

D. none of the above

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36#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

The speed of an ultrasonic sound of frequency 45 kHz iq2opcsmu8c8 0n air is 352 m/s. What is the air temperatom 8c 8puqcs02ure?

A. $33 \; ^{\circ}C$

B. $34 \; ^{\circ}C$

C. $35 \; ^{\circ}C$

D. $36 \; ^{\circ}C$

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37#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

What is the ratio of the speed of sound/;x( ssubwyaso0j- i n e*;cng.x)qy3 in air at $0 \; ^{\circ}C$ to the speed at $100 \; ^{\circ}C$?

A. 0.75

B. 0.85

C. 0.95

D. 1.1

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38#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

On a day when the speed of sound in air is 340 m/s, a bat emits a shr4tl;ut )e x2pq.lnflnku,h e,y2q ;/ciek whose echo reaches it 0.0250 s later. How far away was th42hup /etl.xcu ,tqkle, q2);y ; nflne object that reflected back the sound?

A. $4.25 \; m$

B. $8.50 \; m$

C. $0.425 \; m$

D. $0.850 \; m$

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39#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

You shout at a cliff, and hear the echory+j8u (8xf v +l*wd5jtq8ydw in 4.00 s. The temperature is $0 \; ^{\circ}C$. How far away is the cliff?

A. $662 \; m$

B. $680 \; m$

C. $1320 \; m$

D. $1760 \; m$

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40#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

If you hear thunder 5.0 s after seeing a flash of lightning, the dist(yp)rs,a;cx v-a/ qnzocs 8(vance to the lig-ysp(a v(s,q) 8zcc/ vr ;xaonhtning strike is about

A. 600 m

B. 1200 m

C. 1700 m

D. 2200 m

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41#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An echo is heard 2.0 s from a cliff on a day the temperakgsf/ 4zbn8fyc4 ,n(l ture is $15 \; ^{\circ}C$. Approximately how far is the cliff from the observer?

A. $85 \; m$

B. $170 \; m$

C. $340 \; m$

D. $680 \; m$

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42#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

On a $30 \; ^{\circ}C$ day, there is an explosion. The sound is heard 3.4 s after seeing the flash. How far away was the explosion?

A. $0.10 \; km$

B. $0.75 \; km$

C. $1.2 \; km$

D. $1.5 \; km$

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43#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

You drop a stone into a deep well and hear the splash 2.5 s later. How deep is ode;47cboos* )/dhj. aspkb:the well? (Ignore air resistance, and assume the ve *)hpksdoba:o c;jd.oeb7 s4 /locity of sound is 340 m/s.)

A. $25 \; m$

B. $27 \; m$

C. $29 \; m$

D. $31 \; m$

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44#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

The wavelength in air of a sound wave of frequency 500 Hz i,f+nrrk7w6cnltc , . ds

A. 0.69 m

B. 0.75 m

C. 1.5 m

D. 1.8 m

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45#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Sound traveling in air a*lmya. q/9o/ugbcl ( at $23 \; ^{\circ}C$ enters a cold front where the air temperature is $2 \; ^{\circ}C$. If the sound frequency is 1500 Hz, determine the wavelength in the warmer air and in the colder air.

A. 0.230 m, 0.221 m

B. 0.221 m, 0.230 m

C. 0.321 m, 0.254 m

D. 0.254 m, 0.321 m

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46#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

What is the intensity levell utw(4gj3yfdh ) /f9g5wxwv , of a sound with intensity $10^{-3} \; W/m^{2}$?

A. $30 \; dB$

B. $60 \; dB$

C. $90 \; dB$

D. $96 \; dB$

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47#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

What is the intensity of a 70-dB sound?r6ieb8l 4s0c yaou9-( et:rh g

A. $10^{-4} \; W/m^{2}$

B. $10^{-5} \; W/m^{2}$

C. $10^{-6} \; W/m^{2}$

D. $10^{-7} \; W/m^{2}$

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48#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

What is the ratio of the intensities of two sounds with intensity levels of 70)gw6:facbxu u3i/ g1 f dB and 40 1w6cuf 3ag:ubi /fx )gdB?

A. 10:1

B. 100:1

C. 1000:1

D. 10,000:1

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49#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

The intensity level by 15 engines in a garage isgp; t*lqd0sd6w7g)m o tvz+3j 100 dB. What is the intensity leveld)topq7w 0m+3jd st ;zvl *gg6 generated by one engine?

A. $67 \; dB$

B. $13 \; dB$

C. $44 \; dB$

D. $88 \; dB$

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50#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

The intensity at a distance of 6.0 m from a souldq+m;vr1qm4ft w( mfzc/* b-rce that is radiating equally in all dm 4q drmq(wmf*vf/-+tzc b1;l irections is
$6.0 \times 10^{-10} \; W/m^{2}$. What is the power emitted by the source?

A. $2.1 \times 10^{-8} \; W$

B. $2.7 \times 10^{-7} \; W$

C. $2.1 \times 10^{-6} \; W$

D. $2.7 \times 10^{-5} \; W$

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51#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

The intensity at a distance of 6.0 gx r(pm4 my;w+v9 bo4sm from a source that is radiating equally in all directionvm(r9; 4pgs+b o4yw mxs is
$6.0 \times 10^{-10} \; W/m^{2}$. What is the intensity level in dB?

A. $18 \; dB$

B. $23 \; dB$

C. $28 \; dB$

D. $32 \; dB$

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52#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A barking dog delivers about 1 mW of power, which isloh d 2kxw.*n p1wdj5tm, -kt, assumed to be uniformly distributed in all directions. What is the intensity level at a distance 5.00 m frolkj x, pttwm-nw 5d ,2hko*d1.m the dog?

A. $61 \; dB$

B. $63 \; dB$

C. $65 \; dB$

D. $68 \; dB$

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53#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

The intensity level is 65 dB at a distance 5.00 m from a barking dog. 0oy(8yu fhd7v What would be the intensity leveyu8 y07 hvodf(l if two identical dogs very close to each other are barking?

A. $65 \; dB$

B. $68 \; dB$

C. $130 \; dB$

D. $136 \; dB$

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54#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

At a distance of 15 m from aw(pl4 m(y8zgy sound source the intensity level is 60 dB. What is the intensity level y 4z p(8(wlmgy(in dB) at a point 2.0 m from the source? Assume that the source radiates equally in all directions.

A. $55.7 \; dB$

B. $57.5 \; dB$

C. $75.5 \; dB$

D. $77.5 \; dB$

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55#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

The sound intensity level 5.0 m 7vxl+2zsleu3 from a point source is 95 dB. At what distance will it be 75 d72e+lxv3lsuz B?

A. $25 \; m$

B. $50 \; m$

C. $75 \; m$

D. $225 \; m$

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56#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

The third harmonic of a comy cw+6(buf*; ui,yajqplex tone has a frequency of 1200 Hz. What is the frequency of the fourth harmoni a6uw( *jy,y;bcif+quc?

A. $400 \; Hz$

B. $900 \; Hz$

C. $1600 \; Hz$

D. $4800 \; Hz$

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57#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

The frequency of the thir5m5pcklu* 6qp6z; : fco w;zsvd harmonic of an open pipe is 900 Hz. What is the length o6vo 5w6;s*f pzcp5:kuz ;cqlmf the pipe?

A. $0.189 \; m$

B. $0.283 \; m$

C. $0.567 \; m$

D. $1.13 \; m$

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58#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

The lowest tone to resonate in an open pip sib3vrvzums m0e4r-q1 84n+be of length L is 400 Hz. What is the frequency of the lowest tone that will resonate in an op s3+i8qm 0 -e1rmv4 zb4nurbsven pipe of length 2L?

A. $800 \; Hz$

B. $200 \; Hz$

C. $1600 \; Hz$

D. $100 \; Hz$

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59#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An organ pipe open at both ends has a length of 0.80 m.kh yfx 4 lx(h5n80y )z)z ju3frwad:9s If the velocity of sound in aixx:9nw) 8 (hhfkzd5jzu l3fa0sy ry4) r is 340 m/s, what is the frequency of the second harmonic?

A. $213 \; Hz$

B. $425 \; Hz$

C. $638 \; Hz$

D. $850 \; Hz$

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60#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 3.00-m long pipe is in a room where the temperature)nqeu1y oqn gt 983b5x is $20 \; ^{\circ}C$. What is the fundamental
frequency if the pipe is open at both ends?

A. $57 \; Hz$

B. $114 \; Hz$

C. $29 \; Hz$

D. none of the above

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61#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

The fundamental frequency in a pipe closed aqe 21 lou0 bhthuv5c(/t one end is 330 Hz. What is the frequency of the third harmoh51 (b ohqvt 2/eluuc0nic?

A. $110 \; Hz$

B. $220 \; Hz$

C. $660 \; Hz$

D. $990 \; Hz$

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62#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

What is the length of the shortest pipd(qu7(web ax1(te 4ry e closed on one end that will have a fundamental frequency of 60 Hz on a day ww (b1a7(t (duexq4yer hen the velocity of sound is 340 m/s?

A. $1.24 \; m$

B. $1.42 \; m$

C. $2.14 \; m$

D. $4.12 \; m$

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63#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 3.00-m long pipe is in a room where the temperatuurq)n x6iap,.lhw8n)re is $20 \; ^{\circ}C$. What is the fundamental frequency if the pipe is closed at one end?

A. $57 \; Hz$

B. $114 \; Hz$

C. $29 \; Hz$

D. none of the above

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64#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 3.00-m long pipe is in a room where the temperaaecu 6n0c 7h(em6;v yiture is $20 \; ^{\circ}C$. What is the frequency of the second harmonic if the pipe is closed at one end?

A. $57 \; Hz$

B. $114 \; Hz$

C. $29 \; Hz$

D. none of the above

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65#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A closed organ pipe of length 0.75 m i+tsov r4 lh:7hs played when the speed of sound in air is 340 m/s. What is the fundament4:7ot sr+ vlhhal frequency?

A. $57 \; Hz$

B. $113 \; Hz$

C. $170 \; Hz$

D. $227 \; Hz$

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66#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Consider two pipes of the same length: one is open and the other is cl h hi2va3vz*bi((s 8tkosed on one end. If the fundamental frequency of the open pipe is 300 Hz, what is the fundamental frequ 2 *iztb((hvs3aivk 8hency of the closed pipe?

A. $150 \; Hz$

B. $300 \; Hz$

C. $450 \; Hz$

D. $600 \; Hz$

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67#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Two adjacent sources each emit a frequenc. fdg2chuf 15xy of 800 Hz in air where the velocity of sound is 340 m/s. How much farther back would source 1 have to be moved so an observer in f.cfx2dgf 5h u1ront of the sources would hear no sound?

A. $0.123 \; m$

B. $0.321 \; m$

C. $0.213 \; m$

D. $0.312 \; m$

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68#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Two speakers are placujv4iq 2pd-0ki1nd iog 3 vi(:ed side by side and driven by the same frequency of 500 Hz. If the distance from a person to one speaker is 5.00 m and the person detects little or no sound, which of thj3dqv :uo4k1-0g ipni2vii (de following is a possible the distance from the person to the other speaker? (The sound speed is 340 m/s.)

A. $7.7 \; m$

B. $8.1 \; m$

C. $8.4 \; m$

D. $9.1 \; m$

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69#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Two tunes have frequencies of 440 Hz and 444 Hz. bhi5cqre3e5 vbwm6b2sw( eb6 4:e(od What is the beat frequency?

A. $4 \; Hz$

B. $442 \; Hz$

C. $884 \; Hz$

D. none of the above

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70#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A music tuner uses a 550-Hz tuning fork to tune the fhue+j :s4eo7 mrequency of a musical instrument. If the tuner hears a beat froju +s me7:e4hequency of 2 Hz, what is the frequency of the instrument?

A. It must be 552 Hz.

B. It must be 548 Hz.

C. It could be either 552 Hz or 548 Hz.

D. It is neither 552 Hz or 548 Hz.

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71#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

The wavelengths of thyma8v /zjzb/*a7r 6iqe sounds produced by two horns are 6 m and 7 m respectively. What beat frequency is heard when the horns are sounded on a day when the velocity of sound is 340 m//b qv j8y*az i6r7zam/s?

A. $5 \; Hz$

B. $6 \; Hz$

C. $7 \; Hz$

D. $8 \; Hz$

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72#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

The corresponding violin strings on two violihrgz0 f(ng 7;asd w28ezw:qz ,ns in an orchestra are found to produce a beat frequeng ,8r 7zfzaw e0ng(;dq2hzws :cy of 2 Hz when a frequency of 660 Hz is played. What percentage change in the tension of one of the strings would bring them to the same frequency?

A. 0.2%

B. 0.4%

C. 0.6%

D. 0.8%

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73#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An observer approaches a stationary 1000-oi z:3ukl(it. vcmbau w7z* ::Hz sound source at twice the speed of sound. The::cbvtziw:i3uzu( kma . o*l7 observer hears a frequency of

A. 4000 Hz.

B. 2000 Hz.

C. 500 Hz.

D. none of the above

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74#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A sound source (normal frequency of 1000 Hz) approaches a stationary obsk;tv6l +hpst9 .g+eexerver at one-half the speee+9tek+sg. l6tpx v;hd of sound. The observer hears a frequency of

A. 2000 Hz.

B. 500 Hz.

C. 1500 Hz.

D. none of the above

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75#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A sound has a frequency of 1000 Hz. If a listener moves with a speed of 30 yiov*oyc /3y42et 38; hjnqms m/s away from the source, what is the frequency heard by th c8nqo jimev; y42y3/so *yht3e observer? (The sound speed is 340 m/s.)

A. $912 \; Hz$

B. $919 \; Hz$

C. $1000 \; Hz$

D. $1090 \; Hz$

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76#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A police car has an 800-Hz siren. It is traveling at 35 m/suh t*rn1ry yg5n 8/- ,fd;urjg8zy(vs on a day when the speed of sound through air is 340 m/s. The car a5gtsudny8 ;-ruh8r1 g , fz*vnyr/y(j pproaches and passes an observer who is standing along the roadside. What change of frequency does the observer hear?

A. zero

B. $82 \; HZ$

C. $166 \; Hz$

D. $249 \; Hz$

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77#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

What is the frequency heard by a stationary observer when a train approacx,jot 1 om1gf*h2ll3 ohes with a speed of 30 m/s. The frequency of the 1ftxm3 ojgl*h,2 loo1 train horn is 600 Hz and the speed of sound is 340 m/s.

A. $551 \; Hz$

B. $600 \; Hz$

C. $653 \; Hz$

D. $658 \; Hz$

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78#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A train is traveling toward you at 120 km/h. The train blows itsax d38ua,ezy : 400-Hz whistle. Take the s3: ua8zea yd,xpeed of sound to be 340 m/s. What frequency do you hear?

A. $444 \; Hz$

B. $439 \; Hz$

C. $364 \; Hz$

D. $361 \; Hz$

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79#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

You are moving at 120 km/h toward a stau: on5mnk t un6g7f2n(tionary train. The train blows its 400-Hz wh62n tu nm:n k5(oug7nfistle. Take the speed of sound to be 340 m/s. What frequency do you hear?

A. $444 \; Hz$

B. $439 \; Hz$

C. $364 \; Hz$

D. $361 \; Hz$

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80#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A train is traveling away from you at 120 km/h. The train blog kai u6l3*:pows its 400-Hz whistle. Taklip: ka3g*o6ue the speed of sound to be 340 m/s. What frequency do you hear?

A. $444 \; Hz$

B. $439 \; Hz$

C. $364 \; Hz$

D. $361 \; Hz$

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81#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A train is traveling away from you at 120 kmiqb sqw gclgr65f8lv 4ej. 943/h. It blows its whistle, and you hear a tone oqib8rq4jle53 wcf49s6 v.gglf 400 Hz. Take the speed of sound to be 340 m/s. What is the actual frequency of the whistle?

A. $444 \; Hz$

B. $439 \; Hz$

C. $364 \; Hz$

D. $361 \; Hz$

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82#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

The frequency of a train horn is 500 Hz. Assume the speed of sound in airq,+hnyd7oab0uful7-1 xh5 i p is 340 m/s. What is the frequ17 xud0h h5, yq +nboi7ulap-fency heard by an observer if the observer is moving away from the train with a speed of 30.0 m/s?

A. $500 \; Hz$

B. $456 \; Hz$

C. $548 \; Hz$

D. none of the above

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83#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

The frequency of a train horn is 500 Hz. Assume the speeds/xjq) dfs.8vs h4i)x.x( jqsew (jw 8 of sound in air is 340 m/s. What is the frequen x(ij/h.(s4)d)jws 8f. xqjsxwv eq8scy heard by an observer if the observer is approaching the train with a speed of 30.0 m/s?

A. $456 \; Hz$

B. $500 \; Hz$

C. $544 \; Hz$

D. none of the above

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84#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Sonar is used to determine the 80ml(hksc jb5speed of an object. A 40-kHz signal is sent out, and a 42-kHz signal is returned. Assume the speed of sound is 345 m/s. H0 h k8clmj(sb5ow fast is the object moving?

A. 6.9 m/s

B. 8.4 m/s

C. 331 m/s

D. 347 m/s

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85#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

The half angle of the conical shock wann.:fb c ,9lyl brjag,0s99tc ve produced by a supersonic aircraft is $60^{\circ}$. What is the Mach number of the aircraft?

A. 0.87

B. 1.2

C. 1.7

D. 2.0

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86#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A jet flies at a speed of Mach 1.4. What is the half-angle of the coniha5 cdeulg098:u6 s jgvya2o4cal shock wave formed?h:eayd2lca 405jvo68 g gus u9

A. $30^{\circ}$

B. $36^{\circ}$

C. $44^{\circ}$

D. $46^{\circ}$

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87#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

The Concord airplane flies from the United we0oyr++8ve n States to Europe with a Mach number of 1.05 where the y+w8ren ev +0oair temperature is $5.0 \; ^{\circ}C$. What is the speed of the plane?

A. 334 m/s

B. 337 m/s

C. 351 m/s

D. 359 m/s

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