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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 statec5bf e04v1;*mxai xvq ment?

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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 ffj y2fo b4a9/c3)og hconducted 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 io,5bh;eig;92d fwlh 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 6zxt 0ab/6 szw4fet h(velocity of sound? (Assum(0xa h6fs6b wtet/z z4e 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 Huw51 fakcz/6wb)gs.zox/ (va jw8 0nj z sound through z/1x.uf)svbg0 kcwj/(oaaj zn5 ww6 8air 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 2u( f7m7fv8j pe00 Hz sound in ai(fvpfum 8 7e7jr 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 frequencies greater than 20,000 Hz arlqoo8q5 yk/a2mya dlp3) 3 c+he 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 y4,cfu yk5:loa;zx +ux.q laq:22ry r20 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 soum+kf 4au bx/ e,us26ewrce is emitting waves uniformly in all directions. If you move to a point twice as k u2 a4ee ,/fumx6+wsbfar 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 divergin4xbi4elo 8rc+ kl36a lg waves, 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 a distance d from the source is I. zy7bxd )* 31na jn7wtm What is the int7 yx1b m3)*n na7dzwtjensity 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 sound source that iscb g laj6ru3y; a0w*(n radiating equally in all directions. What hap6;nuc ( wjal*0gbra 3ypens 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 nj44 xlokc,/d7wr2fn all directions. What happens to the intenkf wcn74/j,r24o nx dlsity 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 soundcxhay d6r 3jxzgb2/1) 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 tonerj /d- ckrb lyf /4)icv*su:n9. What characteristic of the s d: -cibvrs/yufj4r9/ )kcn*l ound increases?

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16#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What determines "loudnessfm p b 4j,ymjg1 zs34qhx4w;y;" of 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 h3non4(g ego 0"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 air into /;*e pttbewnqcbqd qkd-d5:o z93 n+2water

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19#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Pressure and displacemuoozeh27 hq:.+y b6 tbent 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 on3wrfw py sp.7: a guitar string and the sound wave generated by the gui.: w7p3pwsryf tar as a result of 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 m 8xs01cadcc ;which is open at both ends, there

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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 41;uwncsp 7 )cmbly5cz /9 lpxof the three lowest tones producuwnx cmlpzb;9 l4y7 c5 1/)psced 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. )/-dl tn-j1+vepbgjp+.hk ,i6pz lud Which one of the following frequencies will not resonate in the same pu+6i d 1 kp-b pljz/h.l-)dj+,g entvpipe?

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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 resonat-dno5 y/o. no3s 0ytbaing at its fundamental frequency. Which statement o ty ysa0nn5/o.b3do-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 70c:; mha8o4 qr9uy upinl7lythe 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 ob nj(-5zlw 4a:q2i nkhf the three lowesh n4ibzk -w:an5 q2(jlt 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 Hz. ijr (.eg:0 b:ip/ prmgyl))hs1 jk(gaWhich of the following frequencierpbr1jga) is gpkjgm:(hi)0 el (/:. ys 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 69;o1 e xwdvsxis resonating at its fundamental frequency. Which statement is cd ows1x6;9v xeorrect?

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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 ttg)3j tjn9m84 yxw-vthe same source. Each speaker produces a tone with a frequency of 200 Hz on a day when the speed of sound4-mt xw)g 93 njt8ytvj 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 hyhxz oe13)1h rc g;r-o w e,lcn53e.w5h ffl5have

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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 partb a 8c pf3wc76)n+tqraicular beat frequency is heard. What happens to the beat frequency if the frequency of one of the tones wcnbr7q+pf 3ac8)6t a 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 explai . ,eoxzlu t*k(a2i8kins

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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 statirt htq-nhysc/.li.y - 4aj l9(onary observer. The frequency heard by the obstals..9 ( cl4ir- j/-qhytnh yerver 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 nl4nm6.nxwtgh :; 64tsah 9uathe ohnn6u;gtma9:lsxh. nt 4a w46 bserver 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 9k.f;mdn vc:nnr( zr;9p: cn rto double its MACH-speed, its half-angle will decrease by a factn dz(nm. krn;;n:p:rf cr9vc9or 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 frequenv-uhw/u8 jpb0 cy 45 kHz in air is 352 m/s. What is the air temp8/-vwhb uj0 uperature?

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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 r;i+*go jx8h0.r :;exg;j lvuwoff 7hat $0 \; ^{\circ}C$ 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 a shriek whov+qfl v ;k.l*(v ,raddse echo reaches it 0.0250 s later. krllv *vvqa(f.,d+ ;dHow 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 tempa0rlkx0c7qp 0 erature 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 52vdu9z q9kydzbd 5 yd5xs/s hy w8:0)d.0 s after seeing a flash of lightning, the distance to the lightning strike is abohyyy2859sd d zkws5d 0dd) :vb/uq x9zut

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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 kfgtm; p9)y4pis $15 \; ^{\circ}C$. 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 aplq ce+5dm1x , deep well and hear the splash 2.5 s later. How deep is the well? (Iql1 +,xmdpc5egnore 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 wavq:.2gaasao ,ye 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 a (e c i1f6xm)mquiga8 :n9wbk.t $23 \; ^{\circ}C$ 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 wic5wxp4 e/o2 mpq2rg .lth 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-doko1qk 6dpiii9; 9ly3B 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 thruh0z ,t( +hgse intensities of two sounds with intensity levels of 70 dB and 40 u(,0rhsth gz+ 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 garage is 10o6l 3 mw1ws8 6tcgtxtc(1j-zmz)h1yl 0 dB. What is the intensity level generated by one e tx6 hsot1zwm zlywt 3g jcc-l)(m6181ngine?

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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 equalu3n, z0 mqsnc ;6, 81wj5f.4n hhtrtqh bmf+akly in all directions i1th6q5tbu c0k4znfmjan f8 hrhm,nwq +,s;.3s
$6.0 \times 10^{-10} \; W/m^{2}$. 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;ghvo ux,61k qr9l r+e.0 m from a source that is radiating equally in all directg ule1;v9rkx+6h,q or ions 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 +m; dl 4tucvn(qq6eohj: 4wg)to be uniformly distribu(:dnuw lqgh ) jcm4voe;46tq+ted 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 ji +9wij1ndy1e*h l69y(mqdw 65 dB at a distance 5.00 m from a barking dog. What would be the intensity level if two identical dogs very close d1jd yn*j1 69y+wie m( 9qhliwto 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 sour oy+hfv6a; f9z+apn9ny3o 4imce the intensity level is 60 dB. What is the intensity level (in dB) at a point 2.0 m from the source? Assume tha a9oofpa +nyy3m 4ifh6+nz ;9vt 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 sourr)kr u. zq;u)t9 yp,2yfcwxw- s)z9jm ce is 95 dB. At what distance will it be 75 dB?k)m) r,xq rpuz;zw .9 2t)-s9cwyyfuj

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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-m(cw+ixihgxl/ds -bd v 7cqh)13 bv0 the frequ--h 1dwxd(cm 3vg)bc+0ivhq b xls/7i ency 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 tha*p-2s v5foa n;6vjfat :yt m,*ob5 third harmonic of an open pipe is 900 Hz. What is the length of the piphno*56ts;5 vb:2-ofajy matv p,*ftae?

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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 400e/n -s39awvj:3z ygds Hz. What is the frequency of the lodasye :/-wnzj3g93 vswest 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 velocity t.hp-u 6cr+p oof sound in apch6+ potru-.ir is 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 in a room where the temperatu m rzvhmji-9(/re 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 inldpg d9m(yg3h .br80 q a pipe closed at one end is 330 Hz. What is the frequencb 0dqpgh9gy .(d 3rm8ly of 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 o.n2 -kmjuu sco)r+md mz, ;-gnn one end that will have a fundamental frequency of 60 Hz on a day when the velocity of sound ism,c;m k.u urds)2g zo-n- mj+n 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 p54cypy+0m(y uhxwkmy* 6 i0q in a room where 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 tu d73nb/ o pv8r2ophi+he 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 playedjup+ h:r* a-av-7pxe shp,; mi when the speed of sound in air is 340 mp-hx;u:i,r mhs7j v +*app-ae /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 thy pgi0c1md.y2 (hm*hde same length: one is open and the other is closed on one end. If the fundamental f *. pdm (ihgyy2hdc01mrequency of the open 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 where the velobm 7zk;o1rbom1ra89h city of sound is 340 m/s. How much farther back would source 1 havkbb or mz7ao mh91r;81e 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 byajio 3vri6m/- 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 no6ov jiir-m3 a/ 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 and 444 Hz. What is the beat frequencys 7a0mgo6q9(bsm: 5r ,wxcbyw?

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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 frek7hk mn :x +1lkde:9vlquency of a musical instrument. nl mh1 :ved97 kkxl:k+ 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;oqor b 0l;8hg horns are 6 m and 7 m respectively. What beat frequency is ho o;8bl;h 0rgqeard 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 strings on two violins in an orchestra are found t 0t:q.fuoe 7 ztrl7vt9o 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 samerut 7. q0tzev9:fo7 lt 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 statioejs)t5xp8696hikobrcu ., pl nary 1000-Hz sound source at twice the speed of sound. The e5ob66.k ltc)h,i9ux 8spjp robserver 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) approaches a stationary observer e)h1vk f2xp (up:y54 /k0ebxq2 uyrao at one-half the speed of sound. The observer hears a freqx 2k/efe )xub0h(rqk:p a 4po2yv1 y5uuency 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 ag7x i3sj,/);wfvggf l v;o+ fp listener moves with a speed of 30 m/s away from the source, what is the frequency heard byx+f l; 37gf ),vsjo/gwip;gvf 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 ,qfuffy,2+nr2c2 a-hjy8o fs 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 frequc or22+hfy -,f,ayf sfq8j2nu ency 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 hg; l(;bl5b z:azhhm-tjr .g6a train approaches with a speed of 30 m/s. The frequency of the train horn is 600 H;b l5arb l6z-t (.hmh zh;g:jgz 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 9mmfox-8lp7 +ynznt9 its 400-Hz whistle. Take the speed of sound to be 340 m/s. 8ofnmt m979xlyn p-+z 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 stati3k73 saj l48,pe oaomkonary train. The train blows its 400-Hz whistle. Take the speed omes 8loaaj3 4k p,o7k3f 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 whis 1 gsqdkpq7zm34xf bf5 3iht(;tle. Take the speed of sound to be 340 m/sxp d qf7 (;134bhtf5mig3kzqs . 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 v3 rpv .db.glsvi2j.d99hl(d blows its whistle, and you hear a tone of 400 Hz. Take the speed of sound .3sh vjd.2gil brlv dp d9v9.(to be 340 m/s. What is the actual 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 of soundi3 /v6 vfk/t(o9+mvmz:)ytowy2seot 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 speed of 30.0 moomoy( 3tv wm 9vsi f/e2ztt/6y:kv )+/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. yk6m1r mfjp3+ Assume the speed of sound in air is 340 m/s. What is the frequency heard bykym+r 63 jp1fm 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 object. * qf2s6f,c8e)cf em ld A 40-kHz signal is sent out, and a 42-kHz signal is returned. Assume the,62sde )q8fl cc ffm*e 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 a w vksxxuq.7o5xuxl etd,e3/ :0;v:naircraft 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 conifly)-a 6*ihgjcal shock wavefgiay* jl)h6- 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 tod2uip3x o3 (ew Europe with a Mach number of 1.05 where the air temper 32du3(pex woiature is $5.0 \; ^{\circ}C$. What is the speed of the plane?

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