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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 znaqj.g s*)5ggpxcca k 6umf .1(3 g+46p mqvyis 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 fastest through93ifluyp +x d4

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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 (uuu wz2ch9 zie(771( gtvpnlsteel 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 velocity of souna./qct,d me bd6)2 yxczq8a+ gd? (Assume that aq6q2)c c zgd/+ bm,ey.dt a8xall 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 ofiqe j9yk0 aa/- a 400 Hz sound, the velocity of a 200 Hz sound through / qiaej0aky9- 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 4cpog:q009 7i pnx 6pqw00 Hz sound, the wavelength of a 200 Hz sound in aqco:0nwg i0pq9pp x76ir 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 frequa;bkgoimr700c / 8 .c7s )nlulcpzoj 7encies 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 lessn-p8x ( r+tgfd 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 emitc r4)8,cu jkrx1s xl(cting waves uniformly in all directions. If you move to a point twice as far 4rx 8jslccr1u k,)x(c 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 propo+8 0 jh.nd y,i+fdv mmrcs6d4qrtional 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 poiniz j9zkwbeq.m-fergw/9k212t source at a distance d from the source is I. What is th9brq.g-2mkee z921fkw z /ijw e intensity 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 soundu s n*,; )8ot 36 wrfysi.zc6itdrai.p source that is radiating equally in all directions. What happens to the intensit;nt 6zrt pr6) asws 3y.icfi du,8o.i*y 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 all di )qawn pj;g4f0rections. What happens to the intensity level of the sound? It;0pq4wjnga) f 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:2ie c (o6- up2/sxm n fea9moicw;7xs 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 emittinwd rj4)0a59qi6e xh ong a pure tone. What characteristic of the sound increaxhna6 i0dew4r5qj)9o 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" ogxmu/5d jfb3;r zfv b (3,zmc-f 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 s3:t.xle +bv e"pitch" 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 imyh++kz+)hq9 qet h,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 displacemekleu jpid7/x4 80k otx-8m qw8nt 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(k6ynu z apk p7;2jnn8 a guitar string and the sound wave generated by the guitar as a result of n2apu(np kn kj687;zy 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 both ends, ther;wmi17v* 4 4 rwud:omzr a;yhre

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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 o0u0pop *m-2-giuh lolowest tones produceil2o0u uo 0-p*pomh-gd 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 L is 200 Hz. Which one3ws- 1iu+ek uj of the following freqwj 3ui +se1uk-uencies 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 itwh27 f(v nhq7s resonating at its fundamental frequency. Which statement is co(w7n v72fht qhrrect?

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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 ope*(-m)rvrb am ma *ca0e7mv.a mn 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 lengthp l-sqs zg,y*; L. What are the wavelengths of the three lowest tones q*-slz; , pgysproduced 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 pipedzpn ckgw 8b3t)s ;:8nnv3t .y of length L is 200 Hz. Which of the following frequencies will not resonate in thatyn3p .tdc gn83;b)svwz :ktn 8 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 clqnet 4 j00wk y+j8;pxhosed at one end is resonating at its fundamental frequency. Wyjkq w 0jnx84ph;+e0t hich 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 mf essu-*1 1zwy:lj;psame source. Each speaker produces a lusw;- 1yp*se1:zmf j 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 p- y 8.j+xu4cwwhsj5bbeats, 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 sgbs/ l9q do11lounded together and a particular beat frequency is heard. What happens to the beat frequency if the frequency of one of the tones sb d/ql ol1g19is 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 explaikkq5v ewij4m0gft/u h8-8.lii(m yn 5ns

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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 frequency heard by the o:a8zpk f2r/r,ib zzccv( ;4hfbserv hzf4( fzpar,8bv2 ;:c/ czkirer 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 hearr)c y*zqnk r+2e2 4tlod by the obse2l yqr4rt)2*+nckzoe rver 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 hr(erpq*lhgzsf m(n2 n e79n6+ alf-angle will decrease by a lnenn(9+ (zhs 2prmqeg f76*rfactor 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 sounam ar,h )h 5y)w-/;:wyglyxdkd of frequency 45 kHz in air is 352 m/s. What is the air tw,k)l dmx g/y5 :hhyr;wa)ay-emperature?

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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 z) x+l aeu* r--1pw.cq * qdhqgp.zv:kof 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 sa dbp 359tqu/gound in air is 340 m/s, a bat emits a shriek whose echo reaches it 0.0250 s later. How far away was the object that reflect 9q5/bud3pg ated 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 9vwy86of xd(ak :pfb -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 distance to t ;gx86* ,mwnym oclatq(*x5d2znu pd-he lightning strimq; t *,za256(m*ypo gl8xnxdwdn-ucke 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 z,jms;cdi96:k d h s(sa 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 t y),o ct41jqj/;.suf qs5xntand hear the splash 2.5 s later. How deep is 5q no jtu1jt.4x,f;yq ts )/scthe 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 of a so4rqof ;mzg 7(bund 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 atb p.b+-h d+jxe $23 \; ^{\circ}C$ 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 wiz u(oqwpx6y iko 0-6x0th intensity $10^{-3} \; W/m^{2}$?

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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 of5,2krw ygs3yrl*jc 9o9 -ztzz a 70-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 h0pe,pwy )x1i sounds with intensity levels of 70 dB)ixhpw, p y0e1 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 by 15 engines in a garagewo+bi 1-hftr190v oh s is 100 dB. What is the intensity level generated bhhvo191t br s wo0+i-fy 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, w wi(u mhrtmrl7 +g1;;qn2ws from a source that is radiating equally in all directions iin7r;,2 wh+r( tus1 mw;l wmgqs
$6.0 \times 10^{-10} \; W/m^{2}$. 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 radiating equa5 r 2rqefuj8las qy9fde)c2 )1lly in 28qr1s9ur)e)cf5d jal fqye2all 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, 8zru)b3;ao 0 gpz g6onja6o .rwhich is assumed to be uniformly distributed in all directions. What is the intensity level at a distaongz;g0juozr .ab)a6 op 68r3nce 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 at3vrr kasc j+7- a distance 5.00 m from a barking dog. What would be the intensity level if two identical dogs very close to each other are b7 rs+j3c-krav arking?

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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 dB. Wh(c2 csz;:e bdx3m; oehat is the intensity level (in dB) at a point 2.0 m from the sours3cebhe; zdm:(;2 cx oce? 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. zr(i a 0s 6;6zsud3czh At what distance will z6 is03zd;sc6z a hr(uit 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. What is the fg9 bgk0l t9n*frequency of the fourth h bt*n9 09fggklarmonic?

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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 harmowz3w )+yzk au ;bwy8i4nic of an open pipe is 900 Hz. What is the length of the pip+48y;ukzbz)yw3ai w we?

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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 xmmd10(j :e*zmst7k jpipe of length L is 400 Hz. What is the frequency of the lowest tone that will resonate in an open pipe of lxd1sj: * 0jkmem(7tzmength 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. Ifymh)w( hs;lu3 the velocity of sound in air is 340 m/s, what is the frequency (u3h slhy)m;wof 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 tdm* ct owe3cu+ y5+3ecemperature 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 pipex7,jmnz (x-, ponr+: u.oo/kz/z6qfk4ggx zi closed at one end is 330 Hz. What is the frequency of p-6znuomz(kxxzroigqzj/., , 7/ k:4gofnx +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 *ak-3j)au6rjm 43 i8hxcws8kr- rbz fon one end that will have a fundamental frequency of 60 Hz on a day when the velocityj3 akrhmrxuz j8wc-br-4 fi *a 68)s3k 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 tde wwhppvz zyc :558,eocy11b (r2jn, he 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 t,m(p 79:1(zndiusd a nnfiv, a room where 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 /pi gafiel67l1h s9i 1speed of sound in air is 340 m/s. What is tg l 6p7/eiah1i9sl1fi he 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 thb yx2j r 8ff*mb,gy ,mpfjgy(t) 4/(ase other is closed on one end. If the fundamental frequency of the ope8m * ,gybj ymfp ft/farb(2 )s(j,yg4xn 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 wx;7,*udw;(2f jqlsdpa: 8qshz3 i equhere the velocity of sound is 2 7i(jq8dq*psewu, lxdza ;f :h3qu;s340 m/s. How 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 dreuz - i) ew x8yjo)6b0mwb,o/ iypp,v5iven 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 pe,w,ip6wvu5-op j beybio)/y) 08 zexm rson 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 gn;k3fu nd;w0 q5/fdrfrequency?

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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 pfx mrr72z41:brr t++2 zvetpfork to tune the frequency of a musical instrumert t2+4+:rber2f 7rzx1pzp vm nt. If 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 produced by two horns are 6 m and 7 m k l/wv-/ w2c8uzan*wa respectively. What beat frequency is heard when the horns are sounded on a day when the velocitcav/l8aw 2k w*unz- w/y 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 orchestra are foundcpzxz9x) - hjnp42ll+ to produce a beat frequency of 2 Hz when a frequency of 660 Hz is played. What percenxn z-2p +xp9ljl)hzc4 tage 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 st:mgw5zyl6 hjc (d32b7vnez6bationary 1000-Hz sound source at twice the speed of sound6b5em(wgcl 3: 6dznv2 jhb7yz. 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 6fobo6 io0d;w) approaches a stationary observer at one-half the speed of sound. The observer ioo6 ob w6;0dfhears 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 b7 u4xv*ip az/rs)2lymoves with a speed of 30 m/s away from the source, what is the frequency heard by the observer? (u*ya2 7l 4rpis bzxv)/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 da42 czew(xykf;y when the speed of sound through air is 340 m/s. The car approaches and passes an observer who is standing along th;x cy 2fk(w4eze 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 d93 0ibamgn+;-/glbo/dwrd i by a stationary observer when a train approaches with a speed of 30 m/s. The frequency of the train horn is 600 Hzd //riwb0b+ -o ad3d9;glmgin 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/lr.07d 2 lt1e t(t1 jxiif/oo/els kf8h. The train blows its 400-Hz whistle. Take the speed of sound to be 340 m/s. What frequenoief 0.lkrso fit 71/t/jtd(8l1lx2ecy 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 towale nb;hedi5w2 u9*9qprd a stationary train. The train blows its 400-Hz whistle. Take the speed of sound to be 340 m/s. What frequency do you hear59n;ui9w2 pe bqed*hl?

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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 aw0k2 psrn plir lg8n l2b9v*:kdawh( 76ay from you at 120 km/h. The train blows its 400-Hz whistle. Take the speed of sound to be in8: 0dpl79p r wagrbk(6hl* 2k vs2nl340 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 bltvcpl, 5k+k9 (inogd-ows its whistle, and you hear a tone of 400 Hz. Take the speed of sound to be 340 m/s. What is the actuadk - gitl(con59p,kv+ l 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 q0*tv6 m6y s;eosg(m5dk9 rg p d2m/x4q+alfjspeed of sound in air is 340 m/s. What is the frequency heard by an observer if the observer is movingm9kxsmo 46gm d2edrply( ;s a6gqv* q0+fjt/5 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 H xdd h9/0rc1hnz. Assume the speed of sound in air is 340 m/s.0 1nrhdx/dch9 What is the frequency heard by an observer if the observer is approaching 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 kihqxa eebn h4 zg.a++yqxp2;l4(4 r,object. A 40-kHz signal is sent out, and a 42-kHz signal is returned. Assume the speed of sound is 345 m/s. How fast is the obje4gqka+b+ 4xl4(rh n2ehpqeazy x.,;i ct 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 aircsfgfia2t8h cs;z4 m0wg2x e (:raft 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 iszqp2eg7ng0h*4cp +7 9wmct f x the half-angle of the conical shock wave fo07nez q c*+xmpg gc4t79h2pf wrmed?

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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 Statesq/c0znp 5qkg 1 to Europe with a Mach number ozn0c pq5k/q g1f 1.05 where the air temperature is $5.0 \; ^{\circ}C$. What is the speed of the plane?

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