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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 st -5okye4l y1tvatement?

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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 c, flftzf d,yem9zfr:3h1 .z x4onducted 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 soundm95zdz58tcobeq ez8 )qg)mw v)yq /c . 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 to the i 9. .)( 8jkcxp6milcijfp/fqvelocity of sound? (Assc.lj)iiiqk 6 mp.cpf/ 89f x(jume that 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 velocity of a 400 Hz sound, the velocity of a 200 Hz sound izc5s0 a1d3+utrwc:/ mkbq/nthrough a/qd1i3 :b s5mn zcr0awku/tc +ir 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 wavelength of a 200 Hz sound i; 5n+-uodzm man air ia um-o;m5 dz+ns

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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 Hz are e/c bqg,jgr, s: hf,+qv5ix(mcalled

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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 th1omd p;jq07d han 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 ;k rnr.7fg3o iall directions. If you move to a point twice as far away from the source, the frequency ;g nr7kf.io3r 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 pr sqhljioy161)oportional 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 fbg1j;shf+ *6se t )frxrom the source is I. What is the int ehfs+b ftxg6)s ;*1rjensity 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 froe1yrs 5n 3vbz.8r dd*xm a sound source that is radiating equally in all dirn1r d8y v.*3zsxr 5bdeections. 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 f+2 vllr4 v;9l3,let slp(tt(q*ieskequally in all directions. What happens to the intensi (9l23 se*,vr+lif t(ll 4tsvkeq;tplty 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 sounghv5e/ ; jgye,d 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 characteristic1s)rjm, pti4lb x(txvu38/ px of the sound increasesu rb(l) tmip8, xst4x1vpx/j3?

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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 z7ghn/*o s 1ximusical 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"-+ye-gygto.-p f f.)kuzph z ;nx6pm*yvr(u 6 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 in vh5g 9n;ud*koto water

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19#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Pressure and displacems :tq*pebm e*d,okx2w*y4n4wl4 pm9 lent 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 the sound 1op(nle :gab2 h;fc 5ezk +a8swave generated by the guitar as a result of th+:c( s1eg5 nh2ezopbkf a8l; ais 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, 4u 0+*m l rccr,r d)j:wzfls*fthere

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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 wavelengthsqa.)g xn +dndhm3x:y ( of the three lowest tones produced by this pipyh(3dqdxna+. g:m n)xe?

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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 lengt0; n*vv (uievzh L is 200 Hz. Which one of the following frequencies will not resona;vv*n0vz uie(te 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 fundament;16i+ l7(0n9d3cojj m4gzme mfb wkjbal frequency. Which statemefoj9b 6jm;d ml zwbce+0j1g4k(73 in mnt 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 closed at the otsrwsh9g c1 h.4her, 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. What36n qt2u2sllw are the wavelengths of the three lowest tones produced by3 6t2lq nsl2uw 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 reshi2n;j h x;aa5onate in a closed pipe of length L is 200 Hz. Which of the following frequencies will ;xh a; i5jh2annot 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 yf75 lgu-mj( vits fundamental frequency. Which mvj(-gy u5f7l 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 source. Eachb c+hsg:99 :bk wzhr;p speaker producesgh: pkz:99;wb b+c rsh 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 f*:/ghvqn zep6 nn7c f7 u*-xobeats, 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 8rq84l:6wic bmrwce /together and a particular beat frequency is heard. What happens to the beat frequency if the frequency of one oe4/68cw:rb lirc w8qmf 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 explwm n.ywnks4-t- s;/ azains

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33#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A sound source approach0g nuigtuh 3.:es a stationary observer. The frequency heard by the observer iu30g ig.:hutn s

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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 frtai ki4r(t ./wom a stationary observer. The frequency heard by the obsewait(t4/i r.k 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, ycy w: )wszrvw(9f.f3 its half-angle will decrease by a factocw z vw9ffrwy( :3y.)sr 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 xl3sj(dhvlh46tc 3r(cjghlyb*99 p 8 m/s. What is the air temp(gc(xy3tj998h4p v6bhc hll*dj 3l srerature?

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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 toyke:*t*v z6 khe 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 soh;f+h:pd+ comszwp8y 7 m-*i rund in air is 340 m/s, a bat emits a shriek whose echo reaches it 0.0250 s later. How far awar+-smmpy hpf: h 8o;c*+ zidw7y 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 temperatu k 6v*nf9yluk5y8k- zb8m sz5:vyqe w)re 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 tqz y bwncn)sy3l 4315distance to theb 5q3s yy1w3tn4cn)l z lightning 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 ou9:bknn o0uhw/;br 2 yn a 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 and hear tqq:ugl9 k9hcr*6e,w zhe splash 2.5 s later. How deep is the well? (Ignore air resistance*hl,q :6 z guq9ew9kcr, 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 .sh*4* gq5eicva+bjmwave 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 ay kj +eppd:.b9/ ybvg4t $23 \; ^{\circ}C$ 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 y4 lw/lbk0yu* of a sound with 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 70-dBg (+wzeuuo:nh ,.w7ob 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 withzkv jsf+o0a. - intensity levels of 70 dB and 40 dk sz-vf0aoj +.B?

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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 garage is 100 h0per-, xj:wz:f obz, dB. What is the intensity level generated by one b0 wpjo rz:z, e:,-hxfengine?

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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 fromwf;du /)o:z cf a source that is radiating equally in all direcf dw f)/:uzc;otions 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 frok,b4 :fq5t afam a source that is radiating equally in all directions baf,4fa 5: tqkis
$6.0 \times 10^{-10} \; W/m^{2}$. 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, whicikhn. ln/( se/pc9t f h,*7tm ts4-fphh is assumed to be uniformly distributed in all directions. What is the intensity level at a distance 5.00 m fromlhn 4csts,/m./(-k7*tp e f9fhtihpn 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 barking dog. 1jy4 g:n5e zykvl pm7o3hb9+d What would be the intensity level if two identical dogs very close to each other are barking?zodn7vle+ j m5k 3:phg4y 1b9y

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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. What isca u/ - xx0-ys8ztmrbn .8b+ue the intensity level (in dB) at a point 2.0 m from the source? Assume that the szr-y mu.c/t a8e0b bnx8u -sx+ource 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 me86ys .0ro rbdB. At what distance will it b6 .b8 mrsr0yoee 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 thembc+j nm 5g.t9 frequency of the fourth g9 +5bt.mmcn jharmonic?

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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 ,0 ;qdpk im8 yoj8p8 lr0iv;ysis the length s dki8p;08r0 l,v;ji myp8 qyoof 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 resonate in an -3uzeinsx 4sln,pl-4 open pipe of length L is 400 Hz. What is the frequency of the lowest ton zeup ,3-sn4xn lls4i-e 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 q6g*c+fjb ) po0i:teb a length of 0.80 m. If the velocity of sound in air ioe:6tfijpb * +c) qgb0s 340 m/s, what is the 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 i8ainam4a 4c bbc9 hl0+a:ayv4n 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 pipe closed ateuhf * teyto6h6 zleu7d*/16a one end is 330 Hz. What is the frequency of the thi6 ut o u*7ta*1h/6zdlyhee6efrd 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 okmc*sv2 a;p h5f the shortest pipe closed on one end that will have a fundamental frequency of 60 Hz on a day when the velocity of hva;sc2 k5*pm 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 xlmp r bba2550where 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 w in9vobcdc:gx5.4 g2 t,r dl(jhere 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 6 nd;pyn9;d edplayed when the speed of sound in air is 340eyn ; d;9nddp6 m/s. 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 the same leng39/h.rhsg s(ektqe a+th: 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 fundamental frequency of th9+ar( g k.set/hqe 3she 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 f : pxau 42s(r/uxsb(ewrequency of 800 Hz in air where the velocity of sound is 340 m/s. How much farther back would source 1 have to be moved so an observer in front of the sources would hear no p/x:w (ur4(bu sxa2es 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 frequ 9wgkanjbhvc5d*z* 5bf--:agency of 500 Hz. If tha c-b*a wg55g :9kn-*zfvhbd je 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 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 an:3y :0gk m t.1vbs;;poaxhje id 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 a m2p gswj*h(f ngc3q6n+usical instrument. If the tuner hears a bea *c6gq+fps g(jwn2n3h t 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 produf; z: 0r 3pjlq1uzvx5eced by two horns are 6 m and 7 m respectively. What beat frequency is heard when the horns are sounded on a da;vfe :q 1px5r0lzuj3z y 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 orchestra are found to g2j(np i0e)sce3kp8 bwr3f09qzoou -produce a beat frequency of 2 Hz when a frequency of 660 Hz is played. What percentage change in the tensijn3 ocepoef 2szkbi0)8p - rw(9q0ug 3on 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 at twice the speed ai yimv9mcgqqn*0q(:gk 5zx i 7s;56eof sound. The observer hears a frequ (5mgq9 s yq*7eixgnc:q;05kimzvi6a 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 statie- i12vdq*e6 fkbh.ahonary observer at one-half the spfba1hid ev *2hke.q6-eed 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 speed e92v,vli)h,zg m1hr3dnz n:wof 30 m/s away from the source,,rh2vzg,d) 9:lei 3vzn1 nwhm what 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 o;n ra9 wi5g4+:0cf+jiihrjwis 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. What9rr; 40+wjh i 5fia njcogi+w: 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 stationaryt-ozd, angewz;3 ;q6 qnpf y// observer when a train approaches with a speed o-fdaeg/o;wp6,y/ 3 nzznqtq; f 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 its 400-Hz whis pnve0z;g/ssz.g5a 99mesb9 b0y on e0tle. Take the speezepnvb95.yg0g ; / eo0z 9m s0bass9ned 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 train. The train blows its kuxqufpdxs06 o,,w9v+.c vcm a+(4a.2 p baqf400-Hod6m caq,ux vw v pxfa0sqfcp,u+a+4 b..k 2(9z 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 you0f ej) f)ffff3 at 120 km/h. The train blows its 400-Hz whist3f f))fj0fe ffle. 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 whistle, 9ne e9q.-s.bxv rdu.b and you hear a tone of 400 Hz. Take the speed of sound to be 340 m/s. What is the actual freqn..9budq.-vre seb9x uency 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 8nxa2adi)xv. the speed 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 sinv .8a)x ax2dpeed 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. Assumee fzzed do8tcs+6:; 2t the speed of sound in air is 340 m/s. What is the frequency heard by an observer if the observer is ap; 6s:tf2+ dced8etozzproaching 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,4 wow )zz/ufs .ojyg6 c/ncjm)*m q,w the speed of an 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 object movwo,), juqmzcw.4g/* fz/oy6msw ) c njing?

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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 w/3a zvvfu v9fjy9e7oa 6.o*bt/,ee azave 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 speu7axlg r 5i5quzj8eh,je ;zwf+4 x3x5ed of Mach 1.4. What is the half-angle of the conical shock wave forzh5r5eg4 ujaew7+xx3 qil f 5ju ;8,zxmed?

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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 Unite og.kd*z9ho)dm 36 r8g xvt5sad States to Europe with a Mach number of 1.05 where the air temperaturekvm8 6*)zdhosort59.gad x g3 is $5.0 \; ^{\circ}C$. What is the speed of the plane?

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