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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 rb77ltycg .s).w w-yj is a 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 conducted fastespe+b9w7hl15 vepc; krt 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 soul 9i2e cb4be r255( cdzph-lkand in a steel rod?

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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 velociteqf)ai -v+,o ,fc r7 hpd/q7uuy of sound? (Assume that all other fu,- d7r7i q,uafeh q) ovc/p+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 2+d gyxjj5*px6i0 y -be00 Hz sound through air pjy-x xb g*e60jyd 5+iis

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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 saf6wzm l0gro7m*8o 78syhi ,i7 88r0smflziohowg a, 6m7y* sn air 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 frequencies greater than 20,000 H 4vf zqn7emv 1(rpqr29(o0knjz 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 lellr *9 ,oj)r gb2-o oh9sn1mvoul5yb6ss 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 is emitting waves uniformly in all directions. 4 ,rd6h:egf 10kwl pnsIf you move to a point twice as far away from the source, the frequency of f14dl0nrsgke:hw 6p , 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, intfvrz:r sb 3+/brc 2.qrensity is proportional 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 distance d from the ,p o 5yzt/hn)usource is I. What is the intensity a ph,yuzn/ )5ott 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 sz5z9rs 9 oz5e2 yvoo0cound source that is radiating equally in all directions. W zzo9 rvsooy5c50 92ezhat 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 distance from a so1ix39o zifxv4i-*sbgz /.h qound source that is radiating equally in all directions. What happiv/bzfo1xi.9 3*zix 4ghqs -o ens to the intensity level of the sound? It 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 becomes louder?.b7 6c )uo;e x4kousaf

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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 emititjmn*k1. ad3 ting a pure tone. What characteristic of the sound increaskdmn1 3t.ij*aes?

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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 musical nosy /h* i6c*w*qka:m/ rposz/q te?

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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 musict9m j6palrfuxb v1-- y b95i2ial 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 fr2u yapuf/-a/l om 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 displacementpc+ag cm 14f kg*..)eb *tszgd 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 jzc(gbimc- c *,y qh2*guitar string and the sound wave generated by the guitar as a result o-z gji (2hm* ,by*cqccf 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 whi ocsfuh+ ep:(kg.:gy0ch is open at both 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 wavelenz3 5je9mr7sjh gths of the three lowest tones produce hs e957z3jmjrd by 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 e9h-my e(n jgguj-t+;0 m7lyxlength L is 200 Hz. Which one of the following frequencies will not resonate in theg ;( uje0 e+hyyxj--lnmg7t9m 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 resonadrroa - sr.5kt)12fn a c0qk*sjk(fr: ting at its fundamental frequency. Which statement is corre 2k.ak1r0ok*ssc:ta)j (f rnr-5rqdf ct?

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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 w ul8( / / zrl)d;dr,8yno v7rldos,fbat one end and closed 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 length L. What are the wavelengths of the tmwdayb q730x y0nu)e2hree lowest tones produce3dwqa72ybye 0mn)ux 0 d 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 pip k*elegf r 27eej5y;a)e of length L is 200 Hz. Which of the following frequencies will not resonate in gfle2ey;ak7ejr )* 5e 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 resonating at its r,e d ,mn1m(uvfundamental frequency. due r1,(m,mv nWhich statement 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. w;pmunt /.zi; //merejuc13* ;v gum j Each speaker produces a tone with a frequency of 200 Hz on a day when the speed ofpmjuj3e/ 1mn i./z cu;/we;ur mtv;* g 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 beats, the two sound wavkym: 5p7d(bese.g+ ke es 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 particular beat freq*mjaey9w6 i)s 4qp g7suency is heard. What happens to the beat frequency if the frequency of one of the ew 9i4py* qmjg 6ass)7tones 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 explaigy hrm5qqy 3f 8v8c rx1mu/u24ns

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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 obsnqv 6 pk)8 uhnj3x3m+8-edd pjerver. The frequency heard by the obserk npjexvdp)q838m+6u3d jhn -ver 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.jk5hl :w pgj9ver. The frequency heard by the obs:w9ghl5jjp k.erver 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-speedrdt 6rmpjo 4r v(doqtf/sp6)nc h011. , its half-angle will decrease by a factor ofv 1md/p qn4por 1jtrcdorfs0 ()th66.:

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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 in air is 352 m/s. What ixiy cw275 2qels t wy2c 2x5qli7ehe 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 of2(4d gwp0ydf - n0qk)irpejw. w5g -ue the speed of sound in 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 in air is 340 m/s, a bat emitsm wgo4z:r;aj. a shriek whose echo reaches it 0.0250 s later. How far away was the object that reflected ; grj owam.:z4back 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 4.00 u. dihs(0d bdsu2 8-v3bhafek): + ugjs. 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 lib;uth2 95 1xj6note chghtning, the distance to theh x265t 1jt;u9encboh lightning 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 a4gf lv)+dk f gq*5j+gc cliff on a day the temperature 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 andn:/mgr ayfsg6y67e ; he3is4d hear the splash 2.5 s later. How deep is t rnys:f/ysg6d 4ea7h6ig3; mehe well? (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 ofv3o,l pnvy/2 v a 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 air at i7l m rpw;/e7c$23 \; ^{\circ}C$ 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 intefk ev4: cnq9 d;ywb((ensity $10^{-3} \; W/m^{2}$?

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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 70-dB soung7 v.-kgy,j3 kjn i+dcd?

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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 igtga, ; t2h(s1ljas -cntensities of two sounds with intensity levels of 70 dB 2caga; -,(gs lstj1h tand 40 dB?

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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 ei v1rgm/1nn5engines in a garage is 100 dB. What is the intensity level generated by one enging1v5/e1nnmir e?

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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 is radiating2wd op5bsok59 equally in all 92psk5owbd5odirections 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 from a source tha 5 7mg2iyfuwu 3;ln*htvph7k-t is radiating equally in all directiom5yu h-7f v*; l237kutnpwih gns 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 assumed to be unij:+h flb*:b: vmbq d6nformly distributed in all directions. What ivbhf :* d:6 jb:b+mqlns 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 al c4f;n a6/;4jumnoao 5r lgp/t a distance 5.00 m from a barking dog. What would be the intensity level if two identfa c lrn l6p5om/;oau4g/ ;n4jical 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 intensity level is 60 dBqbkwuq4).vm br3 rqn)t. 80xy . What is the intensity level (in dB) at a point 2.0 m from the source? Assume that the source radiates etr8uv)3bxrw.kqb) nqm4 y q0.qually 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 source is 95 dB. At what,*ybn + y gpmxw3+p+hyxqd1m7yh**v b distance will it be 7*b+wm*q +1 xy,dyvh+*bh pxp3y 7n gym5 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 the k )ji.jz01uvmc6;g); izifro frequency of the fourth i;rg of1 j. u;i6zmkjzcvi )0)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 nv lpsr.q f)z bo(j1j 7(:hh7nthird harmonic of an open pipe is 900 Hz. What is the length j(:)jso (l7hhbf7 qvnn.z 1prof 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 length L is 400 Hz. What is39xbbfz 2yk,p the frequency of the lowest tone that will resonate in an o3bpbz2 fk 9yx,pen 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 bod*nkve 3zr7m d6g cuso8c587a th ends has a length of 0.80 m. If the velocity of soun7an *r783eug o5kmdz6dcvs 8cd in air is 340 m/s, what 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 roo7 s+qv is(:sar7kx68o kh* zjwm 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 closed at one end is 330 Hz. What isyl/.u:z pqfos ,b64zr the fre r,:yf z.s6b4uzqo/plquency 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 end that will have a t 7s(5e3oa wwd +at..xge rv7.,xnhcbfundamental frequency of 6x5ocb,h xv .7d3 t(gw ae+e.sa.7w rnt0 Hz on a day when the velocity of sound 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 3 r,yfq85pvo f5ztat7the temperature 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 temperature s( tmso+m* idtll;o1g 6*os(nis $20 \; ^{\circ}C$. 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 pla3 8g0 (:vgwfehmpqe m8yed when the speed of sound in air is 340 m/s. What ismpefh(3wm8g0 q gev 8: the fundamental 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 same length: one is open and the other ism 7 ka.p2st3u(wgu f0uq1rcn tcfu9* 2 closed on one end. If the fundamental frequency of the open pippq r.k3102gtfu*u7 (c unut2csf m9wae 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 ixob tk( ejy(4mdwc:d 8q-e; *m yh,nc:n air where the velocity of sound is 340 m/s. How much farther back would source 1,qkmn cyx :db ;(-eedwhtm(4y: oj c8* have to be moved so an observer in front 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 sid.d i lzy7;tbi27+me sze 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 the following is a possible the distance from the person to the oy;i zt +2zl7 7ebsmd.ither 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 frequenciesqf( n(/3*nda2hugor a of 440 Hz and 444 Hz. What is the beat 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 55*e/ h9g0 f e6f; qlr*e8u:ti7 cyftetj0-Hz tuning fork to tune the frequency of a musical instrument. If the tuner hears a beat frequency of 2 Hz, what is the*8ce;eh /i f tlyetej6ff9q u*r7:0tg 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 sounds produced by two horns are 6 m and 7 m respectivzbcg2d-rv 9/gely. What beat frequency is heard when the horns are soun/g cvd9zbr2g-ded 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+xu wu v/7t9xl on two violins in an orchestra are found to produce a beat 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 uw/vxt +ul97x 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 twice the sp/eri )rbol*dw3pa8 ;qeed of sound. / edrb*qio;3lp) rw8a The observer hears a 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 stauv5g ddow y)5 m1jwkiqg1 lvj. *l8(p.tionary observer at one-half the speed of sound. *v.dp. og (qji myw 1dluvk)wl8g51 5jThe 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 moves with a speed of 303gqi*,ecjp *l m/s away from the source, what is the frequency hea *ilpg j3*qec,rd 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 35 m/s on a day when twyn; g:6r4f vohe speed of sound through air is 6; :yfgwovn4r340 m/s. The car approaches and passes an observer who is standing along the roadside. What change of frequency 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 5ign;;yt3 ts8 wtnk (rby a stationary 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 3r3 kin; gn5t (syttw8;40 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 s.y8-v0x q; (.y8wv;(si ueqj ofrgwc/h. The train blows its 400-Hz whistle. ov-(yfw(g svr.u;sj;8cyx8qeqi w.0 Take 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 stati i o.vn9 t(6rg;.qhwvmonary train. The train blows its 400-Hz whistle. Take the speed of soug on;q r6.tv9.vihmw(nd to be 340 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 mq:3tk74 +ghzd ezef f0j(ty, from you at 120 km/h. The train blows its 400-Hz whistle. Take the speed of sound to be 340 m/s. What frequkjhff:z(e7t0ty 43+m gd z, eqency 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 1sbyn* a0e8i o0mm7i1a20 km/h. It blows its whistle, and you hear a tone of 400 Hz. Take the speed of sound to be 340 m/s. What is the actual frequency of s0e1oy*bmain0mai8 7the 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:l*xhs tej*oy/44 luk 500 Hz. Assume the speed of sound in air is 340 m/s. What is th*l uey ok4*h:xtjsl4/ e frequency heard by an 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 hlop+ lww p u+; gpkkyl/q 8-:-gl-:nl38hnjlxorn 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 approa p8kl:+kl+pynq8 ;-gl/3loj--lnp wh :lugxwching 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 40-k)ys.)g aqw. 8xca1voiHz signal is sent out, and a 42-kHz signal is returned. Assume the speed of sound is 345 m/s. How fast is the object movgqi8o )xvcaaw1 . y).sing?

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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 produced by a supersonic aircraft 78qa nn.wlj j+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 hatx c(1rzars:f *6u+ydlf-angle of the conical shock wave1 rt6xy(zuda:cs*f+r 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 from9smi odts +z.-ya 71ev the United States to Europe with a Mach number of 1.05 wherem.9yesvs-7zi1 to a +d the air temperature is $5.0 \; ^{\circ}C$. What is the speed of the plane?

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