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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 hk8 4)i+x0zv0 zt;ys gwcz-er 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 conducty 9wr2x qlg ,m3mu;aqf cv879ned 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 ofc :z2d a b75qrn10hzam sound 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, o uz;76 wudyq9what happens to the velocity of sound? (Assume that alldu 7qz6 w;ou9y 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, thl*: 2whm v6 m08p41nw, 56uqpq,ee hfl fgaiyie velocity of a 200 Hz sound through aiwfpe1myh06gf8 :lql 62n w a,,* qe5vu mi4iphr 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, the waveleg 1k9f,lm:e irngth of a 200 Hz sound in 9f: l rk1g,meiair 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 f0,jckr2eel8 g( t3 eev7tle8grequencies 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 20 Hz are cw l:sn4 gq*mr6alled

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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 emi8turqa c u+c-fvl92 vc i9gs16;3hvjdtting waves uniformly in all directions. If you move to a point twicd12+9 8r6 vficqv u9gcsa-cjlhv;3 ute 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 pltqz, 4 5*xlynv9l84sd9gu fvroportional 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 source 8rw y:ruwpv/*is I. What is the intensity at a distanc8u/:ry wwv*p re 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 all arrp 9-v7zta8directa8ra7-9 p ztrvions. What 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 a hzz+n-xn:l.f 8r1 gnqll dirf xnn :n1z +qhzgl-8r.ections. What happens 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 l f2lcs04,c/hsxbb. kjouder?

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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 ebn+z1m 65*kre ubi n/rmitting a pure tone. What characteristic of the sound increake ur/6+z1i 5 mnbrn*bses?

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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 noteuaon dq6ix- 0n8:,vlx ?

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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 awdlc 4r.5lk k5 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 watm4k a.m)ki*g18*v k axd na+hrer

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19#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Pressure and displachkr zcf;kwn5) 2bm76cement 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 x0.w7k kv 7s3fwug139q srk*wjvne.v and the sound wave generated by the guitar as a result of this vibrat xn7wvvf.1 w0 rvkwsk97 3qs.3keg* ujion. 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, the0s8uv2 cjsl.3j1tsc i 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 three dz7r0qb u.s ;ylowest tones pro0 z.7suybrd; qduced 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 length y6h6lk9 l (pauL is 200 Hz. Which one of the following frequencies will not rel(6ph 9a6uy lksonate 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 fccglfik izv( 5yxwuk1(..2 q*undamental frequency. Which statement is5klwqufy.k. ci (xzvc1 (gi2* 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 ik2s (r,i-ijrgc f 2mu1 kwp(.is open at 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 waveleng9ff0h5 r8 hwzdths of the three lowest tones 5h 0h rdzf9f8wproduced 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 i6n0vov6xdlo q n 1a29cn a closed pipe of length L is 200 Hz. Which of the following frequencies will non0lnc2v91vd ao6q o6 xt 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 a 3zm grp9aos*k5ynf 1(t its fundamental frequency. Which stasyn9az1mk g* f5o( rp3tement 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. Eac( j j zm sd3lbu:f*nhbtwd6/c+6se*a7h speaker produceahz7u*wdjs /b*jmce66(d n l +3ft:bs s a tone 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 beats, the two sound waves should hais i-y2r3tup 4ge/s0q ve

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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 frequency is heard. jt*nqa5w8zy6/vo lb e,x w-)4 ,wfayc*bhm2b What happens to the beat frequency if the frequency of one of the tonesxw)z26,/8j y5wv anb hba w*,4myclto-q* bfe 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 expll:e j) veiy)6imk3 yofe ,1:xqlejizz1;qm07 ains

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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 bbo-)ndo si*-n q 2k(pobserver. The frequency heard by the obsqob knib-(- do 2)n*sperver 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 stationa(gyw 0k+y js ol6tlj/) 6n6uorry observer. The frequency heard by the obs g(k lr yuo0) onw/s+6t6yj6jlerver 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 half-angle will decrease by a a(8c,rozyv.j fact,8z jvyroc. (aor 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 ,cdxoq1 ( 2/wrcil7.) uvf pls emvq6:m/s. What is the c6m1o cqi7 / xp2,vswqu(lf:vl dr.)e 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 they18gq:8hr)- mf2wd bki 7nfke 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/x k 7eh*zbnwddp486* ks, a bat emits a shriek whose echo reaches it 0.0250 s later. How far away was the object that*nbz e*wdk7d468 hpkx 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.tjr83d xzgc8i+6l :z x00 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 3*:cfta+c xx1nr dn+h5.0 s after seeing a flash of lightning, the distance to the lig1+xfn:c h +r dx*3tacnhtning 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 temperacul/) jrz(tl-tkg ; s7ture 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 is;wmiipt iwp-7j6-u g6 the well? (Ignore air resistan6pgim ti - i67uj;-pwwce, 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 wavezmus, xx5/ h iy0/ih2x 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 airk tf;8 7fis4mwe6plgso85v9z 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 intensitd77wib ;u 4uyl;yqr1p y $10^{-3} \; W/m^{2}$?

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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 cl8 4*fwb tb/-7my. fwwtt1 t+-fpdfosound?

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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 o.tg0wvhz9 srqar p 0*1djai3( f two sounds with intensity levels of 70 dB and 4as zd9* .pvrh30taw i 10(qjgr0 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 engines ; ;9zzd.nw xpp1f3kg+jlkkv.-n wv3uc1n 9aj in a garage is 100 dB. What is the intensity level generated by one enkx.n+kwaw9f;-z v1 lzv1p k.;dg9nj33up c jngine?

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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)zf jio /k7a3fyi 8m8w is radiating equally in all direction)7i88mjif zf3 koyw/as 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 that is radiatin7g bhgkj-+z 3;xnhx d6g equally in all dirkx;h6 bh-+dxjn g zg73ections 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 assumvf6ebd 3qdkh 4:4geu+d+-m nmed to be uniformly distributed in all dire+h3 d 6:d+ mb-eg kmqnevuf44dctions. 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 b o2jhh ahzb3faz.l r78*8ao, sarking dog. What would be the intensity level if two identical dogs very close tz a,hh8obr8z73af.2s*oh aljo 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 fnzn-bi9 zun1kf7me 7 ;rom a sound source the intensity 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 efeziuknn77 n-m 1;9 zbqually 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 sourc7(q .ox0( khfh8::.b bkgpkghc kydu /e is 95 dB. At what distance willq7k ( fp.ko(h ub:y./g0cg8:dx hkbh k 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 co2rd6 aaarnr;1g) dog+ mplex tone has a frequency of 1200 Hz. What is the frequency+ad nr2d;roa) ga g6r1 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 Hz. What is c:8 t4am+r pwve)ma)agjz/6u the length of the :p8ugaat+ )m/ 6rc ejzawmv) 4pipe?

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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 4se)me1: wyu,w 00 Hz. What is the frequency of the lowest tone that will resonate in au e: w,wm1se)yn 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 0svsq;+)emtcd4q .gtx ,h+ n7m.80 m. If the velocity of sound in air is 340 m/s, what is the frequency of the second harvms m .)ten+q 74sqdt;+hxg, cmonic?

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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 tmkuf4h vxn(hi4jz(24 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 pipe closed at one end w3mj 64o1wvs z i6f5sris 330 Hz. What is the frequency of the thm4 536fw wrosivj1z6s ird 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 pip s8w9 n*vsb4qrn 9:ople closed on one end that will have a fundamental frequency of 60 Hz on a day when t4qlp:o*9s8b rvn9 swnhe 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 the temperatuz-cenvq i+m),re 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 temperat azb zm+r/p.;eure 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 thr f-j am).1kjwe:+ opce speed of sound in air is 340 m/s. What is the fua -rjm :j p+)w1.oekfcndamental 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 gw.4 * uwj; zhqjcjlci11 wm:n 8cj-t6the same length: one is open and the other is closed on one end. If the fundamental frequency of the open pipe is 300 Hz, what is the fund mjlj4w.cw jq *jic-:1 1n;6hw8gz utcamental 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 frts3rrp89w8oq equency of 800 Hz in air where the velocity of sound is 340 m/s. H3 oq8pwr8ts 9row 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;gvu/j;rjmx;y8n ll8 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 tnv;jlm;;gxyjl/8 r8u he 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 44cj 2m,renx6 k qquq4-3 nzb,+i ,fnbm)4 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-Hz tuning fors ci.yiawvd;)6 bw(3 n5ei-cwk to tune the frequency of a musical instrument. If the tuner hn y.6d5vw 3;(s-aibec cwiw)i ears 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 produced by two horns are 6 m and 7 m respectivppanexp9h63 ; k fc7xcdj3/x 8ely. What beat frequency is heard when the horns are sounded on a day when the velocity of sou3pd axc;ejcnhk fp/8976x3 xpnd 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 orchestkb/m)t: vg/zdra 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? :/zbgk/t)d mv

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73#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An observer approaches7jqvf5ec4 l xv2j9t+b a stationary 1000-Hz sound source at twice the speed of sound. The observer hears a frequ5lvje497 +vtx2fbjcq ency 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 observero*lj6jsr1v y. at one-half the speed of sound. Th j. 6svryjlo*1e 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 frequenc;y;gik smybg n8(4c5; 9ng mfyy of 1000 Hz. If a listener moves with a speed of 30 m/s away from the source, what is tg4g icny my; g5(9n;y;fm8bkshe 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 i)0h/fdha8 wo bs traveling 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 doesa/8fb)h0wo h d 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 stationary observet s jb9xhq6kkts3gfuq170m)9r when a train approaches with a speed of 30 m/s. The frequency of the train horn is 600 Hz t9h)037 9qx1kqkjmft6 usb sgand 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 b3++uj jr n rvfeuv)+g2lows its 400-Hz whistle. Take evfv)+r+ nu 3 gj2ur+jthe 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 x7.pcjm-dyv o 5ek2e.a stationary train. The train blows its 400-Hz whistle. Take the speed of sound to.-v k7dexj mc25.poye 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 ;/gowqpee n6z r2c);ltrain blows its 400-Hz whistle. Take the speed of sound to be 340 m/s. What frequency2)g; ;6/zcn pwoqer el 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 1a8(xrg t agabdg3 gtg6kp0el*6 p3p8420 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 the whisaatg be08r33 gptag(6p l*g4g6dk8xp tle?

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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 s hkdz+d;;trb+a66f: s nhkev(peed 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 6 n:+k+dd(;vsret6zha hb;k fspeed 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 3i6sp cvs.bn:speed 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 speed of 30.: 3ns6pb. civs0 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-s74eu(p kraxm ob;0mc/ a l17pkHz signal is sent out, and a 42-kHz signauae;(m0cp7 7x 1srb4 p/laomkl 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 conical shock wave produced by a supersonic aircno* d/y*7kuq9t4altbraft 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 1.4kxkjp, m;6 s7d. What is the half-angle of the conical shock wave fo,kdxj ;p67ksmrmed?

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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 wiu rnnd)/y vzb1bwj/hi.0 4b,yth a Mach number of 1.05 where the air nr4bjybuwy/ 0/iz h) nd. vb1,temperature is $5.0 \; ^{\circ}C$. What is the speed of the plane?

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