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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 statement,e q)3bkx 7sv.;/qfxvhc (oek zz47kc?

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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 fastest tig2 28j iqz2bz3*en ny m/tfh4hrough

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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 2vi/gwa gxyl 0 /dfo(h;)uz.7pdcuy 9steel 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 iua v 8zab-14ygd:os+jncreases, what happens to the velocity of sound? (Assume that all other factorsj-+yag 4:uosvabd8 1 z 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 qxm0gcqslhm ((1zt(3400 Hz sound, the velocity of a 200 Hz sound throumsz1th x(0g3 lqc (qm(gh 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 40l+k6 rob7r;zvt m2pn90 Hz sound, the wavelength of a 200 Hz sound in air 7 z+nrotmklv269p r ;bis

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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 f bqwj/-m(kyl ,oqjwr7-w * 8cg35 sez20,000 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 t8yg+b).cr lf. 2aqodt*;eg f frequency 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 is emitting waves uniformly in all i/:v-o.rgya i directions. If you move to a point twice as far away from the source, the frequenc-gy o. vri:/aiy 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 b4i8t 6 /wp40d j uu) 1gzqc6hctpj6ypis 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 poc+gu5qn9-tmme 7 mrj- int source at a distance d from the source is I. What is the intensity am5gur-e- jm cmn+t7q9 t 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 equally in au p iyeb )ozokmf b9-y*03z83all directions. m*-fab)o 3p90obe3 z 8 yzukyiWhat 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 sound source that is radiating equally in am s,ydm1a.,lw ll directions. What happens to ,d1. swmymal ,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 increaseyu jr cd:ckqg3w-7(gq cujmff 1s7 10+s as a sound becomes 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 em./xqtim965d;u v i pscitting a pure tone. What characteristic of the sound i6 .m vdic/uqtpx 9si;5ncreases?

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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 chd b 8bi. kvj*i7u1a-y 5zg)bmusical 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 mus6 k*o(j6lr 5wdr yj:okical 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 indlh*t ejuil 5-(*pg4eto water

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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 arz.22revvf q d u762rcpe

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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 souqd 54,c5whbj-*g kb zgnd wave generated by the guitar as a result of this vibration. What do these two waves have in comm5bj q* dg5,chb wkzg-4on?

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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 endslfko. oaw0.u :w-v qor7qx5sz8a.u 7h, 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 8ats wk96b8 ppof the three lowest tones produced by ttpk8wa968 b sphis 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 length L is 200 Hz. Wn:q84b34alpv+(gguf hg i9lk+t vk8e hich one of the following frequencies will not resonate in49augghv8tlknikb fl+4 8(g+p v: q 3e 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 frequency. Wh0d/dgb6, bnblt, ,snqich statement q6dlb/nnbd ,,t0 ,gbs 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 closevblkxl ld7b ju01o8, s i:.r+ad 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 thret/qno;r,i d3f e lowest tones produceriqd,fn/3 o;td 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 lentl-p)9 yqgq4u gth L is 200 Hz. Which of the following frequen )yq l-up9q4tgcies 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 resonating at its funbm,0ms ghjn cc/7* ff+damental frequency. nccmf mj 7+sh/0*g ,bf Which 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 soue4e p r . onx(fanx3j,w8gwb)q.8g7 qjrce. Each speaker produces a tone with a frequency of 200 Hz on a day when the speed of sound is 330 m/s. The pers gjx8.qn,jpfw4 xnew)3q7g b raeo8 .(on 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 beatt: w63xoku( ds5zhy/as, 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 andf/k , xpwi7l7jqzx13j a particular beat frequency is heard. What happens to the beat frequency if thef1j77ql , 3 kx/jipwzx 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 expyqj 196uh u82tee ebw3lains

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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 frequenrdh:+ fsgux p 0f,7 ; sz7(f/bj7qvqzwcy heard by the observ(f bu 77rfpsf d 7 +:;js/0xzq,wvhgzqer 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 observer. The frequency heard by tx g(zqiby.pxc y,98 jm;5ef7xhe o8pxz9,e cyq;bxm ygi(fj5 7x .bserver 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 z2snr qj9khip2/ c s(3u1lab )nx;*fyits MACH-speed, its half-angle will decrease by a fx)slunp;sbf32rz* /a 1y9qj ic nk(h2actor 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 ultrasonickzm,dms 5b)k/g+ 4yjnxh3 k8a sound of frequency 45 kHz in air is 352 m/s. What is t ) dzn8 5kms,b/kxhgm+yjk4a 3he 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 in air at t f8b6 -ybia7av*2pv v$0 \; ^{\circ}C$ 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,4xq,bqg974ae6myzzk d+xp,g a bat emits a shriek whose echo reaches it 0.0250 s later. How far away was the object that reflected back teb,zmg xg7yap, 4x q96+zq4kd he 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 ob0eq2a k ckt:ng/o+ .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 distanceyyac - u6i-9pz to the li6y-ia- pz9 uycghtning 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 tem 7*l,p7l3b sgyu)9+ewrjyp 2n2px oua2av n+aperature 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 and hear the splash 2.5 s later. How deep up796 pr.i l8jc6ywh) dr,axw is the welwy9,6apdruh.jxl 6 )w pi 8r7cl? (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 a sound wave of frequency 500 Hpg0iogk2;b 1zh3hp 6sz 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 +vj)cgsc + rh)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 itoy uh5 /1zdt3o:/mml;z8ty qntensity $10^{-3} \; W/m^{2}$?

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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-d5zbye yqg t*6x)vlm: :B 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 witt+z9 )r, k *yzb4kxieyh intensity levels of 70 dB and 40 k tr*z)+4ybky9 z, ixedB?

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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 eng g3oac4hv)02fe2r vfrines in a garage is 100 dB. What is the intensity level generatg2r h4ra oevf)302vf ced 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 is radiating eqy24cs kg8t.iqually in all directions 4ksiqct y.8 g2is
$6.0 \times 10^{-10} \; W/m^{2}$. 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 zls6j53qya* q from a source that is radiating equally in all directions i s*z6 jyl3qqa5s
$6.0 \times 10^{-10} \; W/m^{2}$. 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 me4j; i sjgf32qW of power, which is assumed to be uniformly distributed in all gfsj4e ;iq 23jdirections. 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 a9nxist2 wiy22,im+p7a+b g ov distance 5.00 m from a barking dog. What would be the intensiwy9+b 2x2 ps+iim2,igna otv7ty 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 theg 2f0na5j6l3auo jy (p intensity level is 60 dB. What is the intensity level (in dB) at a point 2.0 m froa (35o ujpg 0lnyfa6j2m 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 source is 95 dB. Ah 0x wt5zvo o1-m9bcx g0al31vt what distance will it be 75 wxg03o1-v9a10hzv txm b lc5o 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 2 l 39temm7uqra complex tone has a frequency of 1200 Hz. What is the frequency of the fourth harm2 e9 3lmmtr7quonic?

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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 is t ,xq)hfy zd7ztx *da6ik28qj,he lengthfxztkyx* ,j7 6q d)z 2,qhdi8a of 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 resonar.fh csl .9jc-te in an open pipe of length L is 400 Hz. What is the frequency of the lowest tone that will resonate in an open pipe of length -lr9j.hccs.f 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 arc7s5 m ,cb0jqt both ends has a length of 0.80 m. If the velocity of sound in air is 340 m/s, what is the frec rsbm5j ,c70qquency 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 temperature i-t8eqd..gpor/0 v zcos $20 \; ^{\circ}C$. 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 oneagxp(/x ebx x -6xrg42 end is 330 Hz. What is the frequency oxxg g -6x 42ex/p(raxbf 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 5spavrrok2- 4e r2r6t2maiv9 end that will have a fundamenta v4 rm5 pv6oitae9 a2srr2k2-rl frequency of 60 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+r2lv3 f yavl gt-g8sl:kmt3( a room where the 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 whe(kt*dy7 m54ptvq ykk0 re 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 of3( gt5qpc uufm9i98bd length 0.75 m is played when the speed of sound in air is 340 m/siq9bmdt ( 9cupf g3u85. What is 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 q;;h*zyelo u u q**uo1the same length: one is open and the other is closed on one end. If the fundamental frequency of the open pipe is 300 Hz, whateu;uly**q hzou1* ;oq 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 frequeok7n k/u n gqe3y.(c*kncy of 800 Hz in air where the velocity of sound is 340 m/s. How qnc3/ e 7.ykknguok(* much farther back would source 1 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 side by side and driven b3 tkjs3or1fc 6y 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 toktjrf31o 63 cs 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 .rr9(acfe()vi qxc vt4xg5 o7of 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 550-Hz1z +u:; qtm c3idggdx3 tuning fork to tune the frequency of a musical instrument. I13g: gx;zimt3cd du+qf the tuner hears a beat frequency of 2 Hz, what is the 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*e5 olh m0z 31dddj7vj produced by two horns are 6 m and 7 m respectively. What beat frequency is heard when the horns are sounded on a day ze 7hdml1o*j j5dv0 d3when 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 string njg8cqq*v*v.+3 d k ka x:w6wbq7-dljs 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 same frequency?7jg :x-v ajk*n 8qq3 lc6 +*.bvqwdkdw

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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 spe1 w)p ld4-lju4w j:8f/irurdo2ts *yged of sound. The observer hears a frequo w 8/:tdlyr4j pj -)rwgud fs2i*l4u1ency 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 stationary obsek:l7nf7 znl7 :asp f/hv7jd 8drver at one-half the speed of 7kz8s/:7 7 hldn7 pdja:fnlfvsound. 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 H:p t;bss-)zjw:(v uxp2/bfl i z. If a listener moves with a speed of 30 m/s away from the source, whaz)bx -ji/2lbv:tfpssw:;(u p t is the 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 35 m/s on a day when theg*9asfq3fu 1r p1a,ao3 ronl ) 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 fra3g*r1sq, 1a3 poao lrfnf9u)equency 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 statio*y r a)s*mmdgsco v,-5nary observer when a train approaches with a speed of 3m- g)sar*vy mc*d5s, o0 m/s. The frequency of the train 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-Hz whip7xyv-/ 1oh b1wti i8lstle. Take theoh/i7ip vlty-1x1 b8w 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 trat.z(bm qlm(i9)kv -q .b oxd+ain. The train blows its 400-Hz whistle. Take the speed of sound to be 340q(m)b+z..lvo9m xa tib (kq-d 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. 6/jcg4z okje *i)u;uo The train blows its 400-Hz whistle. Take the speed of so)og o;kz4u cije /*u6jund to be 340 m/s. What frequency 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 120 km/h. It blows i4+y7 ex+lmv szts whistle, and you hear a tonev+melz y+x7s4 of 400 Hz. Take the speed 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 Hz. Assume the speed ofcd,- peyz.w h- sound in air is 340 m/s. What is the frequency heard by an observer if the ode zw, .y-h-cpbserver 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,+n 9j is;gavi horn 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 approachin,v;ni9gsj ai+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 40-kHzr 8,es ek agwkw7+dp c;8kbvu-y/,3j m 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 mo cwrv7;s, age3b+mk ked,jwuy /kp88- ving?

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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 producedhie34ch,b4l j 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 Mack8m knr pv*uc,rqr,0 af1y/b6h 1.4. What is the half-angle of the conical shock wamyv8 *k/nqfuprr6b,0 ckr1a, ve 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 Europe with a Mache:9/jp;y fn dz number of zy/dj :f9;e np1.05 where the air temperature is $5.0 \; ^{\circ}C$. What is the speed of the plane?

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