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习题练习：Physics Unit12: Sound
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 作者: admin  发布日期: 2022-09-26 09:56    总分: 87分  得分: _____________

答题人: 匿名未登录  开始时间: 22年08月07日 09:59  切换到: 整卷模式

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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 is a false stim) 8;hg7*;s pjfgkpdatement?

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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 condu-ny h3 +9wxnuicted fastest through

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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 steel rodbkc +supfcl:925 5, 1mjhdl xjrb43 vd?

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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 incr0coxj 8mc*7ma eases, what happens to the velocity of sound? (Assume that cx8ma mj*7oc0all other factors remain constant.)

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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 sound, the velocity of a 93ctwk jnf qjv:rol0.6lr w cd4w-. u2200 Hz sound througo-wu2r fwtjw3jrk0clc qd:n6 4vl.9.h air is

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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, t*zl 079ov *cbfoko3 gmhe wavelength of a 200 Hz sound in air isg*o 9mo 30vlokb7z f*c

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7#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Sound vibrations with frequennr *z:q 9t,38j kxqovdcies greater than 20,000 Hz are called

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8#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Sound vibrations with frequencfb 7v.22wdyac4s .gxng,ay - exvjm):y less than 20 Hz are called

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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 is8dabg5 a)gkqpd 6 t/+p 2akt*l emitting waves uniformly in all directions. If you move to a p 82g*dakk5q6 pbadlp ) +atg/toint twice as far away from the source, the frequency of the sound will be

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10#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  For spherically diverging waves, intensity is procjx;n3dpjci9 )ks5g fb e/r19 portional to

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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 poi:n dm(,vojw /d/ pxdh.8r1q5 7ffgvv knt source at a distance d from the source is I. What is the intensity at a distaxv1woh8dg.:drnv7,(// v j5 fmpq dkfnce 2d from the source?

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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 from a sound source that-m(oy0kd, cd(ajzohu:) e2 ab is radiating equally in all directions. Whatc-a h dj( koye2d(:0,zbum a)o happens to the intensity of the sound? It reduces to

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13#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  You double your distan0v,v 368w2 la7bmvhx oucl n+xce from a sound source that is radiating equally in all directions. What happens to the intensity level of the sound? It drops by8 6l 2hvna37 bvw0mxxul,co +v

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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 becom rg be9y5vtnr26c 76gres louder?

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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. What characteristic of, cgs(/s,k2pci i6rog the sound increases s/gpk(g,6 2ric, isco?

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16#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What determines "loudne:m o7d-:qnpkksz.12 y0dm 7 6moylz uoi1/ rhnss" of a musical note?

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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*pyo+y0*f 2b itg z5sb" of a musical note?

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18#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  When sound passes from air into wrj.:*tbkl+ o iylj10zater

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19#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Pressure and displacement n*( zwyzticg+ix x +r,hf*.+xwaves are

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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 sound 44axz-a 8h68cjgrncywave generated by the guitarc a4n4r-g y x88ahz6cj as a result of this vibration. What do these two waves have in common?

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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, therey isy.8e84u fa

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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 l 7lk9cg(wz4kzength L. What are the wavelengths of the three lowest tones produced w7c kgkz(9zl 4by this pipe?

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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 in an open pipe of lengthk0zu)yo i hv9,93lwo r sok8d: L is 200 Hz. Which one of the following freq8zy9isw kkrhol d)0:,3ou 9o vuencies will not resonate in the same pipe?

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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 fundamental fr;tknr1c(/+mu khpusn0+ n 5 haes. c:lequency. Which state:n/ush0e a;n1mrsck lcp++n5 ( thuk.ment is correct?

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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 ottk m1sy8z;s t)her, there

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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 lengtj aw-.i+w c:3azv6 xknh L. What are the wavelengths of the three lowest tones prodcx-zji v.aa+ 6:kwnw3 uced by this pipe?

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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 lengkwj/3f4t9fe mk - k;dmth L is 200 Hz. Which of the following frequencies will not resonate in thaw met;k-dkfm/4k9 f j3t pipe?

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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 is3 fq792tg. rmqwzub-zzud k) 1 resonating at its fundamental frequency. Which statz 1wbq- zt u)37z2q d.rgukmf9ement is correct?

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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 two speakers driven by the same source. Each ja*uc v 5f: .pulc5dhplm6 )4lspeaker produces a tone with a frequency of 200 Hz on a day when the speecf 6d*4ju:a m5) uvlll5 ph.pcd of sound is 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?

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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 beqn9 ets)1l s o9uhi,3lats, the two sound waves should have

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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 particuk7k)bgw7 + vawlar beat frequency is heard. What happens to the beat frequency if the vb7akw+)kwg7frequency of one of the tones is increased?

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32#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The Doppler shift expkd:ynpnct5*8*vso. f up3p -llains

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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 stationary observer. The frequency heardtvd+wg6o 9-3e*ot3dut qj+o n by the observe633djgq+ne *ut od- ot w+9otvr is

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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 6g x6jce wsku*(g (cwvoh 2l.7a stationary observer. The frequency heard by the objg s 6ekg (62.7clc( vw*hxowuserver is

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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 halr:7 yr. o * nc46(ajaggbwoln+f-angle will decrease by a f6gy.nr:r lb goaano+* c wj74(actor of:

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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 frequenc( - agxads +m:w3-mjiul5( irky 45 kHz in air is 352 m/s. What is theau(-wsi( a:xk m+-gir3l5 mj d air temperature?

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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 iniq)g en +o)gw; air at $0 \; ^{\circ}C$ to the speed at $100 \; ^{\circ}C$?

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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 i7xr -/ntxgn si x*5mj*n air is 340 m/s, a bat emits a shriek whose echo reaches it 0.0250 n5tm x*gsn7*-/rjx xis later. How far away was the object that reflected back the sound?

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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 echo in 4. easd x8 wf-h2sh5u07l00 s. The temperature is $0 \; ^{\circ}C$. How far away is the cliff?

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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 aft*o pvb, ,drtnr ufdb:4gra4(9er seeing a flash of lightning, the distance to the lightni,nf9 gdrp(r r:td 4u,*bo av4bng strike is about

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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 temperatuy 1x;hlc(fn(f2qy . atre is $15 \; ^{\circ}C$. Approximately how far is the cliff from the observer?

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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?

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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 ee:/sgx; cg qm7n t/;h.b-zaowell and hear the splash 2.5 s later. How deep is the well? (Ignore air resistance, and assume the velocity of sounhm; .o cg t-b7zx/:ee/agqn s;d is 340 m/s.)

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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 is rqp5p)3r.e w:p4qv et

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45#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Sound traveling in ax:yarn,.5 gibni t1t h0 i*w5dir 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.

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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 level of a sound with intensity j2boj/n-3uns xv)0zk67yjrqop11xr(w u 9x x$10^{-3} \; W/m^{2}$?

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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 70l/7vk gav9hv2jwdou1l1s/ . r-dB sound?

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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 soun8cy//m gt8 ibrds with intensity levels of 70 dB and 40 dB cym b//rti88g?

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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 engpp3x+ l1f/k jhines in a garage is 100 dB. What is the intensity level generathxk3/fj lp1+p ed by one engine?

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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 sourc yjg cgdxs+p: r0;.1h9tl(zha e that is radiating equally in allht:cp. y1r9 (lj +;0hagsdg zx directions is
$6.0 \times 10^{-10} \; W/m^{2}$. What is the power emitted by the source?

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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 omk(6ly/hsb- et21nzm from a source that is radiating equally in al (kl ozye21bmhn/ 6t-sl directions is
$6.0 \times 10^{-10} \; W/m^{2}$. What is the intensity level in 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 is assumedmq1c04 f *pcxd,c* kqnlnz89g to be uniformly distributed in all dir*gdm, zcqcq0 4 c9pxl8 f*1nnkections. What is the intensity level at a distance 5.00 m from the dog?

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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. What wou:iigio:42g j zld be the intensity: :jiog4zgi i2 level if two identical dogs very close to each other are barking?

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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 a sound source t)rg+k bftp6xqnx;q6fj5l (m (he intensity level is 60 dB. What is the intensity level (in d;(f5nkq( p6q 6gjb l+mx)tfrx B) at a point 2.0 m from the source? Assume that the source radiates equally in all directions.

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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 from a point sourc/z*s*srcbd8 u e is 95 dB. At what distance wilzs/r8dsc *b *ul it be 75 dB?

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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 complex tone has a frequency of 1200 Hz. What is thxy abf;fq:n-yy(l4 7ge frequency of :(-g f ayyqb4y;nf7xl the fourth harmonic?

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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 third harmonic of an open pipe is 900 Hz. What egl8-q40nf fiu)ey t/ is the length of l)u/f- fgitn40 eqey8the pipe?

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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 opfz7.ckw+zlcq1 + uv8 sbrae;*en pipe of length L is 400 Hz. What is the frequency of the lowest tone that will resonate in an open pipe of lebvzk1qr7; 8+wle za+*cfc.sungth 2L?

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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 w+1n ;0zg8qz 4jyevq;*dv iqa0.80 m. If the velocity of sound in air is 340 m/s, whadiv*eqqqnza;08 j w;14 +v zgyt is the frequency of the second harmonic?

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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 t vow s:xxqdjnv2 0+*x/emperature is $20 \; ^{\circ}C$. What is the fundamental
frequency if the pipe is open at both ends?

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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 pim 6xhqd5hgeunn ,a+k) * :2xwupe closed at one end is 330 Hz. What is the freqgnux ,6 *e2adhxhwmnuq + k5:)uency of the third harmonic?

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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,oterpfo e9m5fuvcs+1e9)i)jk) 5my pipe closed on one end that will have a fundamental frequency of 60 Hz on a day when the velocity of sound is 340 m/eok,)ft)1eme5 ro9m )u5p cvj9sf+iys?

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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 t4-abzmkd-wx 8*nv:i gemperature is $20 \; ^{\circ}C$. What is the fundamental frequency if the pipe is closed at one end?

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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 6vurh sid zys. p082-ka room where the temperature is $20 \; ^{\circ}C$. What is the frequency of the second harmonic if the pipe is closed at one end?

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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 is played when the speedlrw avd79 k3f8 of sound in air is 340 m/s. What is the fundamental frequew3k79drafv 8l ncy?

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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 opkv( ;drhb o9b1 z5kaoht0z)z5en and the other is closed on one end. If the fundamental frequency of the open pipe is 3005z5 rod(ba hz) 19htvk0z kb;o Hz, what is the fundamental frequency of the closed pipe?

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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 frequency of 800 Hz in air where the vel/z*kkagc-vsu 8y) +v pocity of sound is 340 m/s. How much farther back would source 1 have to be moved so an observer in fro*zsv/g+ ayk) 8p-vukcnt of the sources would hear no sound?

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68#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Two speakers are placed side by side and driven by the .ncl(61p rrvy0fraw:r kst 24same frequency of 500 Hz. If the distance from a person to one speak w. 6 lp0rcn1r4:tf(rayr2v sker is 5.00 m and the person detects little or no sound, which of the following is a possible the distance from the person to the other speaker? (The sound speed is 340 m/s.)

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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. What is the b28dp*rms a i 23xebfg.eat frequency?

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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 tun;rk jy ;l*z0nz*g2cc fing fork to tune the frequency of a musical instrument. If the tuner hears a beat frequency of 2 Hz, what is the freq* f2g;y*0nz;zjkl cr cuency of the instrument?

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71#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The wavelengths of the sounds produced by two horns acmmv krd z)z11e(gp.( hh687 hbz( fisre 6 m and 7 m respectively. What beafdms(ivg ez6r mz 1 )p1h.z(hh8 kcb(7t frequency is heard when the horns are sounded on a day when the velocity of sound is 340 m/s?

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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 violins in an orchestra are fo k+e dxcg1qq.5und to produce a beat frequency of 2 Hz when ae 1q.gxd+kc5q frequency of 660 Hz is played. What percentage change in the tension of one of the strings would bring them to the same frequency?

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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-Hz sound source at twif. vufy73dhs nx s841kce the speed of sound. The observer hears a fresn 8s4x.y3f7v1khfudquency of

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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 st9o w (-yyn v3udmir;,dationary observer at one-half the speed of sound. The obsd-iuo3 r,;yyn9mv w (derver hears a frequency of

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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 speedxyr)4v+ipxnv; u*7 py of 30 m/s away from the source, what is the frequency heard by the observer? (The sound speed is 340 m/snixv+yv y;)p*4u7 prx.)

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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 tw 0q;y3(tbfl ws cf8(zap x:+sraveling at 35 m/s on a day when the speed of sound through air is 340 m/s. The car approaches and passes an observer who is standing along the roadside. What change of frequency do:x8 f0(q waywb scz3l(+t;sfpes the observer hear?

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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 sta xby s6*u-hu;8y mjtz.tionary observer when a train approaches with a speed of 30 m/s. The frequency of the trah6j-8xy yt.bs z;muu*in horn is 600 Hz and the speed of sound is 340 m/s.

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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 its 400 ftiak t(ur116t56 mne-Hz whistle. (at6ifttk em1 65u 1nrTake the speed of sound to be 340 m/s. What frequency do you hear?

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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 stationary train. The traiylnq0 1k /j6:yz ,mamgn blows its 400-Hz whistle. Take the speed of sound to be 34l ,z1: mankq0g/6jy my0 m/s. What frequency do you hear?

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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.vc*r /wq+l8zil4b v6wjb. f i. The train blows its 400-Hz whistle. Take the speed of sound to be 340 m/s. What frequency do you hearv b6l clw z4ii*+rb.vfjq. /w8?

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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 0ue3cys*y ya.f9xye( .f0dsz you at 120 km/h. It blows its whistle, and you hear a tone of 400 Hz. Take the su.yxf0ea yds (0*fcyy39z .es peed of sound to be 340 m/s. What is the actual frequency of the whistle?

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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 3 9a2k7 nur3fyc(nx; *myzr7ik a8iqiHz. Assume the speed of sound in air is 340 m/s. What is the frequency heard by ak ;7kui 8i7 2m*ayn i(c9f33rryzq xnan observer if the observer is moving away from the train with a speed of 30.0 m/s?

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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 spk,hh9d1hjx2d mcg7,5 mz 6mpeeed of sound in air is 340 m/s. What is the frequency heard by an observer if the observer is approaching the train with a spd 1g cz5m6d,ph97 mx2jkh,eh meed of 30.0 m/s?

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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 swp4m/ lnwd9) b3vb//y*y:ra ew3wjoh peed of an object. A 40-kHz signal is sent out, and a 42-k4 wprmj9 wb: n3dy/lwh) /w/a vyeb3*oHz signal is returned. Assume the speed of sound is 345 m/s. How fast is the object moving?

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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 conica) lnhesma8:fq*-t 6uwc x28n/vab 7 azl shock wave produced by a supersonic aircraft is $60^{\circ}$. What is the Mach number of the aircraft?

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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 )3def:-agybp the half-angle of the conical shock wave forbfa de3):pgy- med?

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87#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The Concord airplane fliehp muy w*h;8svqk/* .ms from the United States to Europe with a Mach number of 1.05 wh/q8.uvhy ;w m*khpm s*ere the air temperature is $5.0 \; ^{\circ}C$. What is the speed of the plane?

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