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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: 游客未登录  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 f:m 8x-o9zk ysbalse 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 con l4gwcs.5 .unfdcm 81(tjs(qr ducted 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 souna:,cfj9kmi3d d 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 tfes:z1exd l9d;pu9h 6 nt-m a6o the velocity of sound? (Assume th 1fuz9 x6:e9lm eas -n6d;htpdat all 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 velox u04ovfud*,yv83 bqp+ (ppqnjm h+/n city of a 400 Hz sound, the velocity of a 200 Hz sound through air isd4nxpppo3y,+bq/q v jum(uv+ 8n 0f*h

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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 h. z 4gq1exu,e2)k zypz6dp 0iav6c.kin,peg2) y6qd6zkz izh 4.xka.pu 01 ecv 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 f olw2 -l lis rd/x)3;xe2oay0yrequencies 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 witvn,pg q 9+vo3xh 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 emitvfx:wac+w-yqer8+hyp5 7c 7f9 hxfx2 ting waves uniformly in all directions. If you move to a point twice as far away from the source, the frequency of theawfh- +p x7v:e5 rw cfx9+cxh8qy7yf2 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 m)z e uuq:y4aox 7s61k(hjix3waves, intensity 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 wwwt8 ht8hc m+3 (few-4ipm)h a distance d from the source is I. What is the intensity at a distance 8mtw w( pe-ih+3) tcwf 48hwmh2d 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 frohpg kl(hogx-9de8 bu0d0hgm-p338tom a sound source that is radiating equally in all directions. What8et-o b(3udp gk8xhl-o 0gh0m9g3phd 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 eq67 dd1kli*err ually in all directions. What happens to the intensity lev*el kdid7rr16 el 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 followin6v,(d7 v x)wnw 16r9xg tc +w8jjzdpyqg increases 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 emitting a pure tone. What characteristic of t:7q- v+vk j4vqykfg(j he sound increavkqv-qj:j y gfkv4+7(ses?

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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 ag3 l, fsbs,5+2cp cbfg 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 "pnydf6 f)d)3 xpitch" 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 3 nbfn ) i)eh 0ptmrgz.ef2;m1water

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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 are6b+0ike l5b0; xvp1ljl hh:dz

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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 w 7o1i:xk0 qghon a guitar string and the sound wave generated by the guitar as a result of this vibration. What do these two waves have ig owikh0xq: 71n 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, the-b,wziqbxx vgi, *7ee/w 0l2s re

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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 the thr yftuku(1wx-9 ee lowest tones prkw9yfu 1(ut-x oduced 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 reso: o bsjytth16num01/y1q xt2znate in an open pipe of length L is 200 Hz. Which one of the following frequencieysmtn:0b62zth/q 1y toju1 x1s 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 fundamen+f*m i2v3)dofp qbii. tal frequency. Which state q.mb+pio)3i f*fdi2v 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 aw.ic+05)ovu wc)yoovyj2 b )jnd 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 t dtv/)8pq1p4bxe( kjche wavelengths of the three lowestk/1 tvpqjb84ed(cxp ) tones produced 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 length L is 200 H9n+wqk r).hcw* ,hiqw.bjh q/w6w z4uz. Which of the following frequencies will not resonate in that pipecbz nw,)*wwh.u j4k96hqrq. +w/qi wh?

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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 fundamental frequba;ua 4ez hj)6ency. Which stathu zb j;e4aa6)ement 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 betwo tvmpw:duo -kkft+w7c. 3/y 7ylfr*1een two speakers driven by the same source. Each speaker produces a tone with a frequency of ./k7oc yf-lwt ofy+pr*v1 dut 3 7mk:w200 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 beats, th mu(hur 6/l+yee 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 toglb)-bw,fscv ci 8)i )lsoon34ether and a particular beat frequency is heard. What happens to the l i b c,sic4f))-bvso8)o3wnl beat frequency 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 exp5ou1n drrar+lgs79 x1lains

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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. Thagn5 q)+ ycjt.e frequency heard by the observ.5 q)gnjacy+t er 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 tka5, e8xc vw9qhe observer ae5 vqx9kw ,8cis

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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 haj7a2j 7 bl)pdylf-angle will decrease by a facda byjl j72)p7tor 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 frequency 45 kHz in air is 352 me ,qd9tpq gz; rkpo9ij-,n 0o5/s. What is the air tndq9-,p jro59i0q;ek z pot,gemperature?

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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 og.i .1+vrzvbh. mlf gd *+t p3jd*cvjczj;l47f 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 i7ayd pr-xow 62kp, f+emits a shriek whose echo reakaf xwp py2,6dro7+-iches it 0.0250 s 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 4.00 s. The temperature i * lslp6qg2+ w8hz8scns $0 \; ^{\circ}C$. 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 t9v)1ok xyi(d 5k8wf3v9bzmaof lightning, the distance to the ligx)3 8wfy 95o b9iv(m1tvzadkkhtning 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 temperature h,l*hws .rnabka9f1 x+syj g/,- +e54gtc wmc 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 latertsp2-fga-tr- . How deep is the well? (Ignore air resistance, and assume tgf--sa2 -tprthe 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 /g:u;jbv :byj 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,e)8 4vtszw fo0lkmn 67ox:d g $23 \; ^{\circ}C$ 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 intensityalkz -xd :.* wuw/sm)m $10^{-3} \; W/m^{2}$?

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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 k/f/27y. rgqbkhm7 nz70-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 with intensity lz.u5gs 6;4wyohucl x0 evels of 70 dBhy6uoc; wz.s x4u05gl and 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 byk+ vqrls-h,)m+/lbkk w,fqt 7 15 engines in a garage is 100 dB. What is the intensity level generated by one engifq hb)l,sw v+r,ktlkqm7 k+-/ ne?

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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 equally v3kfu7hp q8 2q21 phfqin all dfh q 2qv 1q23upfp8kh7irections 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 fhbu3vh; au+:tigu *.of 6.0 m from a source that is radiating equally in al +*;.:hgvfauubu3 h itl 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 assumed to bcn2*44e/o e4, jjkjduuf3yyl e uniformly distributed in all directions. What is the intensity level at a disu4c u,jj/d43e* lk4foyj e y2ntance 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 distadj8ofir zwk) u):u-1:jxd l e-nce 5.00 m from a barking dog. What would be the intensity le)8:dw u u1l:f)- jidxekojrz- vel 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 fromwp emhyj397/p a sound source the intensity level is 60 dB. What is the intensity level (in dB) at a point 2.0 m from the so3 w7eppjmhy/ 9urce? 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 mf, d r wht s/iaf9.v3f0aif./h from a point source is 95 dB. At what distance will it be 7d0r9fisf, f //vti3hfaa.wh . 5 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/r; y9n :9dl agytrp3u frequencr3:9/tad ygrnp9u;y ly of 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 Hzdks ic8:s n u3koa*,j6. What is the length of the:j,o 8* udki6nkssca3 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 ajgklm:3j ,h7 fn open pipe of length L is 400 Hz. What is the frequency of tjjlkhm,: 37gfhe lowest tone that will resonate in 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 r6jqiwba;p, 5 a length of 0.80 m. If the velocity of sound in air is 340 m/s, what is the frequency of the second harmonic?;pw5 ,rq6 iajb

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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 gy /x8(+ 3e)vuthmf quin a 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 p95,88sl gyxr;y ng uyl83vdx mipe closed at one end is 330 Hz. What is the frequency of 9sg 3n, rxdg88m8vuyl;lyx5ythe 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 endrp2:e1ek kmd9 ni/, *5oxrxxi that will have a fundamental frequency of dmx ex2*9,nxr1 i/5e: rikopk 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 a room where tf y8;) hop*csbhe 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 whs + 38v-ugvrbdere 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 speed of sound ib2d56 fl*l6yu .xaqebn air is 340 m/s. What is the fundamental fr5du. bf qlxly6eb*a2 6equency?

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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 themcdx09wknz 6t4 ndj8g/j 871tyf( *jgp ezdh7 other is closed on one end. If the fundamental frequency of the open pipe is 300 Hz, what is the fundamental frequency of the closjnp8 9 6gdyf7wkmj8*/h j 0etg7z dc 1t(xdz4ned 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 eac7*chfp 6zpi)uaz5 t9+k ubh+zh emit a frequency of 800 Hz in air where the velocity of sound is 340 m/s. Ho p+zzp 6k5c9f7u hua+)zt ib*hw 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 by the same frequency oc h-wwrslj b;9+0gxw 2f 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 xwj +9w2-sh crgl0b;w 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 is9tda ;jb-rc3nsi9h; u 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-Hz tuning fork to tune the frequency of kfc l.h7fi7,vv2zt- 0iajw0v a musical instrument. If the tuner hears a beat frequency of 2 Hz, what is thev v0 ifc0wz. v277a hftk,ilj- 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 respectivelyh9 3bis g7 rdpmt ;*tq :,t*z1fua ixlg8b*,sc. What beat frequency is heard when the hos:*x8r*i 3s*ib; 1,z h9fatm gptcd7bqtu l,grns 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 orchesbc hhc4p;k .+ gkr4aq5tra are found to produce a beat frequency of 2 Hz when a frequency of 660 Hz is played. What percentage hp k54gcr.;+ qackb4hchange 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 ,)(yme4; pie 5dj:dexzt)p az1000-Hz sound source at twice the speed of sound. The observer hears a frequency:yj,p4ee) t z ma;de(dz)pi5x 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 100mm m(+ iq 7uq8ahel)y40 Hz) approaches a stationary observer at omi8e uq mhy(a+ ml7)q4ne-half the 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 moves with a sp9o hi rfkua) *pxg blnb,/9fv;t70q0weed of 30 m/s away from the source, what is the frequen xp) 9 n*hkvwt0f;a qb,ourbfi9/0l g7cy 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 +qv u,l3ydh9mbu: ix5the speed of sound through air is 340 hy+ qblu5vd ux:im9 ,3m/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 by a stati:t2y nu b/3h.sqsx4lp onary observer when a train approaches with a speed obun x.4/2qs3pts yl: hf 30 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 71 *98aotzhcxpprnl3a2 3 vzv you at 120 km/h. The train blows its 400-Hz whistle. Tar1zo9zphn vvp8ata x* l c7332ke 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 sta n:c;cj m; ,talj,ip9ationary train. The train blows its 400-Hz:lj;p,, ac mja9i;tnc whistle. Take the speed of sound 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 from you at 120 km/h. The train blows its 400-Hz wsgptrn/ 54q6hhistle. Take the speed of soundr/ qn gh6ts5p4 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 its whisz8)iofjw)g 2ptle, and you hear a tone of 400 Hz. Take the speed of sound to be 340 m/s. What is the ac2 pj zfio8))gwtual 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 l2d f. fiwu+h6of sound in air is 340 m/s. What is the frequency heard by2h uf+.dfw6i l 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 horn is 500 Hzds0 fgtav-m;zfe9iv+f:n 7h (. Assume the speed of sound in air is 340 m/s. What is the frequency heard by an observer if the observer is appromv7h:ft 90vie da-fzfn +gs;( aching 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 speedkgbb0 h -6 :hzqn9wvl1 of an object. A 40-kHz signal is sent out, and a 42 l- v09b1:zkwhhbgq n6-kHz 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 10hlk;xm)6m yz h5q5sydc,jh conical 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 the half-angle of the conical shockyc+ d;jq62nw* 6+9 mcdktss oi wavci6k+sndd;t w 9s*oq+cjm 2 y6e 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 f g rn 3zt+r;koegnj;;2lies from the United States to Europe with a Mach number of 1.05 where the air tempeg3g+o er;rz ; tk;njn2rature is $5.0 \; ^{\circ}C$. What is the speed of the plane?

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