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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 f2*x zf:y.r. kjrtoy 6halse 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 a zod bphvv wl2 d3.j(c x-856*iyar-gconducted 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 sound in a steel rof *dh d gjyf;g74:tlc6v yq4o++ih7qod?

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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, wh: ko n-y.f9enfh n93djat happens to the velocity of sound? (Assume that all other factors remain. fjn9o-hfe3:9 kynnd 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 vaveu vg /-jfebi85pja5 u)n 8bo7ju.)elocity of a 200 Hz sound through air ))-oe5 pu i .b/f875b njuuvgej 8aajvis

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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,n+xy81; kjfhz the wavelength of a 200 Hz sound in air is yzhj1n8fkx ;+

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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 Hn b xc3dcxu-18z 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 frequencyq 20l-eak 83fp bxwr t5xk, (q:na/kdg 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 sour ld kk( -2gyxhno3,xv3ce is emitting waves uniformly in all directions. If you move to a point twice as far awayv3x3n g2xdk- yko,(lh 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, int1;q i *qrgioramr 2sv574 vit-ensity 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 so/i5xkroc ltdg/i s,yj iz 6pkz /ej0rq707 h9(urce is I. What is the intensity at a distanotj90hi/pkr/dx( ly 7 z5s/zie7qk 6ijgr c, 0ce 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 so b 3.wfxqtx/y1 u3oz6hurce that is radiating equally in all directions. What happens /6zwqxfyh13 t x.3buoto 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 equall** jd3 u6o pqv* nir9:ulkf9aty in all directions. What happens to the intensity leurq6f *3o *ni p9ak*:utv9d ljvel 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 increasekimc0 pylh+r *-fz +y,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 emittinhg j8(8 fbpbmwic9. 9xg a pure tone. What characteristic of the sound increases?8jbwcx9gp8 h9.fmb( i

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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 4o7ukh6 wag8gupu;bto2 o*0 0 7 hpimjnote?

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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 musical ivbu /g+k9m7v 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 intof*4pr nw((x sc3fkxi5 water

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19#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Pressure and displacemhjz*opsl3)9 t ent 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 and tz1z, k.v( pvobhe sound wave generated by the guitar as a result of this vibration. What do these two waves kbz zpvo1, v.(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, thuw8yodm 9:p( 1hrxr;pere

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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 lehs ,ad3we8v8f d p;+aength L. What are the wavelengths of the three lowest tones produced by te8wd pesf83d;aav,+h his 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 resozuh.f:/m-ly,: za xuznate in an open pipe of length L is 200 Hz. Which one of the following frequencies will not r:.fy u,-:az xulhzm z/esonate 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 fundamental frequency. Wh8jy:9 m cqwp7 d5utq3rich statement is correct?5y3 t :m7cr9qduqjwp 8

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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 closed at thegwhi11qe+ 5va94 zicq 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 ow xxyqyuykz 7i31a /)f/u7l:uf the three lowest tones produced by th7)u: 3w/uuk/fyy71lxaqxzy i is 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 reb-pka;x t1 /kp c6ykcxar,7r2sonate in a closed pipe of length L is 200 Hz. Which of the following frequentr -/kxa 6 xay,p p7k1cbc2;rkcies 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-e hl qml f-,p)lw7.kj is resonating at its fundamental frequency. Wjkl plfmqhl -7w.-, e)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 speaker+d;nvw p1ozb v cx(+:qoee38is driven by the same source. Each speaker producdp:1x+3n;q zb+ 8w(evveoio c es 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 sounx9k6(by jwinrc2+ q;vd 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 ;o 3 pme)+wjuoand a particular beat frequency is heard. What happens to the beat frequencmpuj;wo+ )3 eoy 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 expw lg*) nu)l7splains

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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 owm7:, pc4eluzq2 y s(dvj8h- a stationary observer. The frequency heard by the obs oyvzlwe7p s8q,uhjdm-42c( :erver 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 obse0m 0m1aicxu ebe 2yuy3ad;*/mrver. The frequency heard by the observecua mm;01myeaidb0 3xey *2u/r 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 wiqsx)k,mz u pxf q:65tnr 0*ek*ll decrease by a factor ,qqz n*kxkst 0 m6*5f: pexu)rof:

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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 2 wf3wf*mqg;kin air is 352 m/s. What is th2*w gfq; 3fwmke 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 r 11xl/ki s0ee$0 \; ^{\circ}C$ 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 emits u fc7o67+hwxp5 2f eqka shriek whose echo reaches it 0.0250 s later. How far away was the object that refqhw+o6ef 5x7 kupc7 2flected 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 tem3*+t xrz(w hwljm+mom,.e7qd perature 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 seei qfgfe*9+ jnx t*n9nu7ng a flash of lightning, the distance to the lig*7 9n9xffntjeg nqu +*htning 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 d9xajq9p3 pbrgpoq- - 9ay 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 and hear the splashf2:pz- gcz pwwf2*5be s f(;bi 2.5 s later. How deep is the well?w-wpf b*gz ;pb2ef5izc(:sf 2 (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 50re/c3e6 ,f/y jhbl-gj0 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 ai/c pezn*6n l,s ,uzb4) azi+aqr 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 wi33a b x+ speang+sx)x*xtg i,zl* ,0kjth 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 of a 7qg:fqo45 0na id c:1bq0-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 iiqi; .wri) jlw9cx h51ntensities of two sounds with intensity levels of 70 dj 9l 15chrwiixwq)i.;B 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 hc.fy.- mfk.r+qoy3o engines in a garage is 100 dB. What is the intensity level generated-oho.rm3fk.fq . cyy+ 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 thpqx 4,1otfrrjs 4fo( 0us7y0pat is radiating equally in all directions p4( 1quo7oryp0jt 0fs4 xf,sris
$6.0 \times 10^{-10} \; W/m^{2}$. 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 distajti8c tp9ve/l97 j jp1nce of 6.0 m from a source that is radiating equally in c tj1e/8v 9jp9jl7t piall 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 delivere5 7p+k.vy q+4;huwh0wslu jps about 1 mW of power, which is assumed to be uniformly distributedp kv.7wy4q+huu5+p0j hlse;w in all directions. 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 distance5s yedbs2v8k7qv15q gb gqe8e g,u z,. 5.00 m from a barking dog. What would be the intensity level if two identicss8gbbe q2,e85q5y.gg 7 1vzuv edq,kal 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 dB. Wsirxn 5xpsm6k,+ 7-kihat is the intensity level (in dB) at a point 2.0 m from the source? Assume that the source radiates eqk s 7mi ikxx5r,-6+pnsually 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 3ovowj a4oa3/ point source is 95 dB. At what distance will it be 75 dw3a/ov4ao3o jB?

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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 frequenru;k0)n ai 0tqi+ kis-cy of 1200 Hz. What is the freqs)t0+0i ;i knqka -iuruency 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 .x9e,-mec9ehm9 59 rwpzfsyh the length of the p9959w9h,emz y e erfxp.s-mchipe?

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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 o:qodeak 4 t77cf length L is 400 Hz. What is the frequency of thedco4:kt7aq7e 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 a length of 0.80 m. If the velocip xf plj-)x(:gty of sound in air is 340 m/s, what is thej )(xxf-glpp: 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 room where the temperature isc8.a;w1vz;45+c ,k qbfry pjsyyq 8t w $20 \; ^{\circ}C$. 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 clban n:sk tb wup/157;ti. .jydosed at one end is 330 Hz. What is the frequency of the thirddnkbsyit/:.;.u7 a pt5n1j wb 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 wi * ,qit5dpfvcv21dws0o 1h b;kll have a fundamental frequev1*chdps 1k02;dv ,5qobft wincy 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 a room wr dk26sh 5.kbchere 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 where 6qa4u 7 s*gqine*ly 0fthe 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 leng3qp ri a9 k 9q k(t:3h6zzi7hwd(cpux/th 0.75 m is played when the speed of sound in air is 340 m/s. What is the fundamental frequeq9 (3zi9hxpukq zc(6 3/twariph kd :7ncy?

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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 tob*n 46sf b20f.znjz phe other is closed on one end. If the fundamental frequency of the op6fbzpj20on .b n4fzs *en 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 800v rqb ynsp /m6-qq0-v8 Hz in air where the velocity of sound is 340 m/s. How much farther back pmy/ rqs-b6nqv-q8v0 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 sai*f; pyh b1k l7i)z7mt9cnl7tme 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 tmlz7 *h7ipyl n7t)i;b f k91cperson 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 frequoict dzq k6.9bwi,-; iencies 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 550-Hz tuning fork to tune the frequency of 7.7 ymtu llo9m imza ,31dnkfzno+z95 a musical instrument. If t5z nz1,zkli79myt9uf +7n3m mloaod.he 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 do8.p 2vigddz53 iw) csounds produced by two horns are 6 m and 7 m respectively. What beat frequency3i2ogwd. 8p)5dvd zic is heard when the horns 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 stri1n m4 blxcx.e+ngs on two violins in an orchestra are found to produce a beat frequency of 2 Hz when a frequency of 660 Hex+b.mlcn4 x1z is played. What percentage 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 stationary 1000-Hz sound source afw8 xaktij;a0,n z1q.97 x4bc+qqgqu t twice the speed of sound. The observer hears a frequencyzgx ,9nqx iqa0w.7k +;a8q bf4u1qtj c 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 (normaluymp6 l5ilg6m8ddc -4gn5 up6 frequency of 1000 Hz) approaches a stationary observer at one-half the speed of sound. The observer hear8udgnm- cp4 66 6ml5ulpdyi g5s 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 67wzf1k 1 fpfqb:bx4aspeed of 30 m/s away from the source, what is the frequency heard by the observer? (f 4 xq1abfk7fbp6 :z1wThe 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 traven8yg/cn(d.h (htu*a xling 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 roadsidentux8 a/g h(d*n(hyc .. 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 stationary observer when . xk85xqxzrz3 a train approaches with a speedxz8. 35kx zxqr of 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 you at 120 km/h. The train blows 4wanmrdnt5 vk j25y:0 its 400-Hz whistle. Take the speed of souy ma tkvj:2w4d5 nn05rnd 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 traj pndi,x zk;(+in. The train blows its 400-Hz whistle. Take the speed of sound to be 3p, ( dxnkz+i;j40 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. Th z;.55ufkvqu0fdhj4l9h j.s m e train blows its 400-Hz whistlehmfuh ld4v;s 5z09. j.kfuj5q . Take the speed of sound 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 why4my;5t9bpu h/qlz i*i +h7xbistle, and you hear a tone of 400 Hz. Take the speed of sound to be 340 m/s. What is the actual frequh ;+xt7iqi pymy hubz9*/45lbency 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 500k nzhu..7-y+ 7 ojcu k: ra/iamvtfz)2 Hz. Assume the speed of sound in air is 340 m/s. What is the frequency heard by an observer if the observer is movi) .k+a7cziamk-2u f/: vy ozr.tunj7hng 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 Hz. Assum tfzeqv1j9y eo+l wh ,cpd0*9:e the speed of sound in air is 340 m/s. What is the frequency heard by an observer if the observer is approaching the train witef+hq jc9yp1,0l9zwtd:v oe* h 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 object7fygyf q fc5n09 1 ae0v+7zzrv. A 40-kHz signal is sent out, and a 42-kHz n9e+gq71a 750rf0zyvyzvffcsignal 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 w8sb:04e : jgik:k yyqxtb58 xsave 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 k29/. ukolj;-.d6fhxb aqyj uconical shock wavelbh.-6kk 9.2 oy; udja/xf ujq 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 Mach nu tum :5q.u5lvcmber of 1.05 where the al 5uqt: vm.uc5ir temperature is $5.0 \; ^{\circ}C$. What is the speed of the plane?

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