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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 **;t63gacc-m bpsv*of4krr ta false statement?

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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 g2frkm 16jf /ufc)fq.conducted 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 :poxm: +6ezbwh( n3jzrod?

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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 happens to the velocity of soundat: dn8hd3b, mnj0q +x? (Assume that all other 3xt 0nn,daj m+hqdb:8 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 200 Hz sofw j;6+w hmg8yund through ;f mh8gww j6y+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 wavel7 isf:7i w+ydgength of a 400 Hz sound, the wavelength of a 200 Hz sound in air +iy7 7gid:sfw is

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7#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Sound vibrations with frequenci 1;rnjj. .3a5hejwqsq es 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 frequency less than 207anq.ei)/ tmm 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 is emitting waves uniformly in all direct:u xd9-alkuo /ions. If you move to a point twice as far away fro/l duu9oax- :km 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 propykxi.4pqkj m7sb9 ( fz0a:0jsortional 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 point source at a diqo wt1x+2hd2o stance d from the source is I. What is the in oto2w2qd1 h+xtensity at a distance 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 is radiating etwve6:j; p0eb;q mt0 gqually in all directions. What haj0wtbt;0: e;e 6 qvpgmppens 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 distance from a sound source that is radiating eq)nlszg k7 2b9lyhpw u024 mme4ually in all directions. What happens to the intensity level of the sound? It 7m0ngey w4b 4m2)suk zh2llp9 drops by

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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 s+* pe/ x7djhjbecomes 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 wwh ,qyz()gc -fhz(n;of the sound increases?- zhc(w;y z)fwq hgn,(

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16#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What determines "loudness" eph(bn2e+ 2bem q 5qe*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" of a mua )htaav9e w0(sical 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 fromf 6l0un+ 5aywu9g4v qi air into water

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19#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Pressure and displactth0x4hr+o*jb 6n7 ppement waves 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 wave generated k59me 9 f1qc ri;pedrf26r8lfby the guitar as a rplrc 9fk2r9;6mq fi1 rd efe58esult 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 bot x*53zufuyud6b ru3o ;h ends, there

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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 etdj f6l-::yz of the three lowest tones produced by thisylj:dz:tf 6 -e 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 ir( 1hvwhb;3w byut.u) n an open pipe of length L is 200 Hz. Which one of the following frequenh(3w b u)1.tbhrw;uyv cies 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 frequen-b2jh+fuu/3wj pv ) cecy. Which statement is correcjeub3+vh-wu c/)jf2pt?

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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 closw4xu b 2.q6r04eh c36qrmlo hxed at the other, 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 w5,n8b,of:k, u jwujrlength L. What are the wavelengths of the three lowest tones producjurj ,,,ub5n:f8 kow wed 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 clns kj/dbxbexiu)*,s6mb4zu2: l4jo )osed pipe of length L is 200 Hz. Which of the following fr 4kb:2 o6, u4b)ld i)/jzxn sexm*ubsjequencies will not resonate in that 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 is res2qa7kz6 -yw aq ct s;x.wio nn+o32iq,onating at its fundamental frequency. Which statemennn7q3qiyaqx-wk2two6sai zc; ,o. 2+t 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 speaker x06bxwupd1)0 ,p;px z.fnlyj produces a )wfupylpnj;xb z.,d 16xx 0p 0tone with a frequency of 200 Hz on a day when the speed 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 beayb8 yir*e *s18fllb g7ts, 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.x s2 sydi oq*g0suj;* a particular beat frequency is heard. What happens to the beat frequu x ;0ody*iss2sq .jg*ency if the frequency 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 exp); 3oqw3(;x q(kvcjkopki5 galains

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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. Thezu,fq dd2g5m, frequency heard by the obs zdq2m dg,f,5uerver 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 a stationary obser(o -2kr*yknbcfw*hy :ver. The frequency heard by the observ k2hf y*rk(n*: byco-wer 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-2e lf mjdh8x9ciaf 8a9x 3h,*zspeed, its half-angle will decrease by a facc9889m3x ix hhf*zl , 2fadeajtor 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 ultrasonik*psoc5phr a+5v 37o ac sound of frequency 45 kHz in air is 352 m/s. What is the air tem +53sav7oo pahrpck *5perature?

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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 in *:ev) uvdq, alair 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 in air is 340 m/s, a bat emits)8r,6z-mgm tprve 3tsh+2h 8)boh ji h a shriek whose echo reaches it 0.0250 s later. r g)t6-s h2t8 ,3bm +rh ehvihj8zo)mp 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, akdzajc/5t :qk ee :+kf fn:v3.nd hear the echo in 4.00 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 after seeing a flash of lightning, the disx4o qnn9v3 .pmtance to the lightn3nqv.pox9n4 ming 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 temperat(e. osmu0u 4bm8r2jtlure 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 well an h )*. 5pcu9xjg;0t2pcfju)sb(kugo xd hear the splash 2.5 s later. How deep is the wh2xxtu09 gcps jk;go)( .jfu*)pcu5bell? (Ignore air resistance, and assume the velocity of sound 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 arruhzn0 hf*xn5v ytz1a; ,z54 sound wave of frequency 500 Hz is

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45#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Sound traveling in aif f 2pzg1(8bu :usv r/-)p)eqb ijdd8vr 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 inte(efc.zqu x)f:ps ;m *ynsity $10^{-3} \; W/m^{2}$?

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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 70cnyn*j88 1ef g-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 sounds wic0 05 txm roxlh8(4/d5 ywadjxth intensity levels of 70 dB and 40 dB?rdx 5wxdat/y(lmo x h5 jc0084

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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 is ok+nnf-33+: pst z jew100 dB. What is the intensity level genwj osfzkp e33-n++t n:erated 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 source that nhkj)1.lb;bk/radu4tae4 yz8g1:e u is radiating equally in all direca1kg )udb ktb heyju:e 41 r8na4zl/;.tions 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 m frov ede h/c)q8k7dief6 -m a source that is radiating equally in all directions i)hc7/eeiqd dfev8 -k6s
$6.0 \times 10^{-10} \; W/m^{2}$. 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 assumed to p7bl; um mh8f0ujfd.; be uniformly distributed in all directions. What is the intensity level at a distance 5.00 m from the dhdp ; u ;08fm7ujblmf.og?

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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 jp0aojh ()ts p62j(i cis*zl5would be the intensj ijjp5 hpt* os(i0l(ca2z)6sity 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 the intens8l gm1mbdut;:ity level is 60 dB. What is the intensity level (in dB) at a point 2.0 m from the source? Assume that the source radiates equally in all direction bu;m8t: d1lgms.

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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 fr un1oe-hp. w-pzl 3bw-om a point source is 95 dB. At what distance will itn1bz el--o3. wwpphu- 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. Whatd)jj )ru/pl-piya* w + is the frequency of the fourth hy l)u d r+*pwjjap-i/)armonic?

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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 ot* :;0pwr0n ) eekggrypen pipe is 900 Hz. What is the length o;ek*r 0:yeg r 0pwtgn)f the 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 open pipe of lesz v3hw4u*ex4(/pi 5qn rk *cyngth L is 400 Hz. What is the frequency of the lowest tone that will resonate n3wc45sz*/pu y*v 4(ixhqr kein an open pipe of length 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 0.80 m. If the velocity op 5rf67bimr1ty px ;e+f sound in air is 340 m/s, f6rtyerb5i7 + p1xm;pwhat 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 aug/9h9bej :pi room where the temperature 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 pipe c8w r +k1t(uus4a0e ojmlosed at one end is 330 Hz. What is the frequency s(ow+t8 muk10r4jaeu 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 pipe closed on one enft ewzwe 3v *gpm i,e0l,x. m/u89kh)td that will have a fundamental frequency of 60 Hz on a day when the velocity of soun9wmp0t/3zwfxm hli)uee, vg*8kte , .d is 340 m/s?

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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 temperatko/ lv5o 4(tjt8pbd7e ure 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 a room where the temperamqe6jjg0,) ) , sjwl8ebtt or9ture 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 t4 c1:rzt2 kh3l+0 xhlrmvylj/he speed of sound in air is 340 m/s. What is the fundxj+:c/hl0l r4 rt h1l2vym z3kamental frequency?

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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 ssnjv: 2q-tq, zame length: one is open and the other is closed on one end. If the funqtqj,2:v zs-ndamental frequency of the open pipe is 300 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 velocityc nnupwl,na,;/) :nmwqdpo )2 of sound is 340 m/s. How much farther back would source 1 have to be moved so an observer in front of the sonoqman;,ulnnpw,2: / w c)d)p urces 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 fs6.foqjjkwlbix 58w /4r*y0 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 tqbyo8f.jrfkj 6x0 ww s/4 5i*lhe 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 beat freque*y9*:u jkxh jtt dy fh9p+w8+bncy?

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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 fre90o/3i b myvxdquency of a musical instrument. If the tuner hears a beat frequency of 2 Hz, what is td9vmyo 3b0 /ixhe frequency 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 c (fzvtf* s blr--7bc4m0ph/zsounds produced by two horns are 6 m and 7 m respectively. What beat 0m7r-tbc h4* -z/zlb(vscp ff 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 i xu(a w7vbip4jy6;:dr:0 nywstrings on two violins in an orchestra are found to produce a beatyrjaw:d: xb u w ;(ivy0i7p46n frequency 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?

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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 soundwvnt zh3kn5+4 qd dw(ylkbn++ l2y*p) source at twice the speed of sound. The observer hears atkw)nlbny n 5vw 2dqkh+3*+l+4z pdy( frequency 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 stationarftmj 5y)(frcwb 9yw/graj 8 bm3x7 +;fy observer at one-half /gafytbx)rwc w8b 3(yjr; +mf jm9 f57the speed of sound. The observer 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 mo )x2h .qvjfs7vves with a speed of 30 m/s away from the source, what is theqx j27).vshv f frequency heard by the observer? (The sound speed is 340 m/s.)

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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 35i*ttbi8 rf-qqvt 2(5t1in)6hg3m ipl 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 frequef2 3tq(- nmt 81tviii5)hg bltqr*p6incy does 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 stati5utl6p6ke rh 7onary observer when a train approaches with a speed of 30 m/s. The frequency of the train horn is 600 Hz and the speed of sound is 340 lput k67he56rm/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-Hz whistd 6jo;8(tfun 8rm zxp ck1it2.6dp qf4le. Take the speed of sound to be 340 m/s. What frequency do dp4r6kq jtniut;f2f 8 .8 xmcop 61(dzyou 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 :yykw-q2 2v;ur c9yp8s 8oizr a stationary train. The train blows its 400-Hz whistle. Take the speed of sound to be 340 m/s. What frequency do you hqk:8 ci 2yyp-2y; ow 8rvzsu9rear?

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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 blows its 400-Hz whis00f)b it8sf ; niy,e /ofl*nxatle. Take the speed of sound to be 340 m/s. What fyfinlte8s0afb xo f ,i)0;*n/requency do you hear?

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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 1e+rk:ojev/aw cf8*26i g-euh20 km/h. It blows its whistle, and you hear a tone of 400 Hz. Take the speed of sound to uwej6+:-r/hoe igf8 e 2*acvkbe 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 hog6s ob6df+ni o9ac/b.+c r2 fgrn is 500 Hz. Assume the speed of sound in air is 340 m/s. What is the frequency heard by an observer if the observer is moving away from the train with a speed of6./cbi9 +g+bdaf62oo grncf s 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 thijb.cw4pr z9+a d()bs e speed of sound in air is 340 m/s. What is the frequency heard by an observer if the observer is approachin9 zi4jw d) .abbcpr(s+g the train with a speed 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 speed of an object. A 8-emra oze1h8 40-kHz signal is sent out, and a 42-kHz signal is returned. Assume the speed of souahr8eo1 8 ze-mnd 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 conical shock wave produ4e+kkd3x//j -j0 , mzzjp drglced 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 the half-angle of the cnuznik, d z7,8ft z-pkj;x8.uonical shock wd8z,f-7nk,zk .tun8 ; piuxjzave formed?

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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 States to Eurorhw7n;j6swv9qlgr;w ,bgq 3 *vl0u8 kpe with a Mach number of 1.05 where the aigb;7u s9llrvr8ngqww ,h;36 qk0vj *wr temperature is $5.0 \; ^{\circ}C$. What is the speed of the plane?

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