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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 sta,k kpb gw(f. 9s3c*twjwq5;zltement?

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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 fa iwal82v1 -oluik6 wy,stest 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 ropc1 obpa/l *2a4(gnzjtn n. t0d?

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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, whatxp82u rzw d1.o happens to the velocity of sound? (Assume that alld128u w z.ropx 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 soz pl 2c99rvu4ound through air isz94p 2ucl9rvo

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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 ab3(xs 4ljm4;ov l:urv 200 Hz sound in ail:3 ov(xu4b4ml;vsj r r 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 ar *2 (jg f qd:u-o2cx0ylj9cfsve 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 t8 x0: tx(k1neoksfbvc ,0ikx: n()zubhan 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 w-t:z*8 zefabai a hqr51zh (9haves uniformly in all directions. If you move to a point twice as far awib he (rq:1 h5atzh9zfaz-*a8 ay 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, inte6 )ycbgv4v6 aansity 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 diseh5.nz- riz3y tance d from the source is I. What is the intensity at iz-h5. enzr3y 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+ l/6tgtg1/ ryx7 ptpl source that is radiating equally in all directions1rtp6+ gylpt / tgx7l/. 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 soucvwohh 4:zwm(sa f(kcu9cb,yj+ aett 8)72 .wnd source that is radiating equally in all directions. What happens to the intensi:t w (9azb.h)+ ujtvac8f4ccewy7skomh(w 2, ty 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 inc f ih)no1uyb50h nyw w*pa:)+k-oz,xqreases 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 emitting a pure tone. What chs2u:h:xdb3fxv i * mk(3vh-wqaracteristic of the soun2id bhmufxqv k::sxh 3wv-3* (d increases?

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16#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What determines "louh opls0kd yb7/)g(q nd4jdch w8n73j( dness" 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 "pitch" of m( lhlh,2mv+ua 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 waterky+.t:.pb kh+eaae z +

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19#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Pressure and displac1dqd)x 9.rqek ement 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 guitardga ric zxcg:;,c)q4mrxh, 78 string and the sound wave generated by the guitar as a result of this vibration. What do these two waves have in co ia d8;7 x,m 4r)zc:hg,grcxqcmmon?

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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 bvyeg/h1g yzr7uslmo(8o .+l4 oth 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 t5j2xak+8 /ds*zz keg the wavelengths of the three lowest tones 5se kz/d82*x jzg+kta produced 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 o85i4zr.jk zu df length L is 200 Hz. Which one of the follozij.r z8dk4u5wing frequencies 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 is resonating at its fundamental fr36rx 72wpfq gbequency. Which statement ispb 2r73xgqwf6 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 ope ;n. gs pkdik)2q-pu5pn 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 wavelengths of the three l ,u yru5xzwe- xf ;i4dgf8ez(:owest tonesz er,yxw(5i8efg4- ux:fd; zu 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 200b8pnddse ,-p j 8aijek+/c8c3 Hz. Which of the following frequenci-n88 ,sikedb+ e8pj/cc 3jdpaes 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 is resonating at its fundamental fref 4 hfp csq((-9ry8mqlquency. Which statementlhf my-8pcq(qrs9 ( f4 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 fsj7 h.xm2s7z o+ d/zgtwo speakers driven by the same source. Each speaker produces a tone with a frequency of 200 Hz on a day when the speed of sound igs dx/2oh.jm7+ zsfz 7s 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 vlp(.z ad( x*2 g twr5s+3iiqzhave

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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 7uj o:m;ojb,u/qh+sybeat frequency is heard. What happens to the beat frequency if the frequencyo; hbj7,: u+/ujymqs o 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 exp0w+.uu 0ewf likppg2uit3 /9alains

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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 frequency3 kkxjh (-.hqiex(. ws heard by the observee(x.s qw- hkx jk.3i(hr 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 f:l5b-wxa ed1 mrequency heard by the obserx 15a-wlm :edbver 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 decreax7 ch;ud/, /iyi0l.tcvd jleo j.60kpse by a facix v dp uk oe/i7j6h .;cld0l.y/0j,cttor 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 df4 a3mn9lmch:y 3kzke+ -gm0 m/s. What is the air temperature-knzg9+cml 4 efdm a033:yhmk?

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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 aj(p3: (vi )j pfzdnic1t $0 \; ^{\circ}C$ 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 kz08 q)hq j4ep b(xg/znu;3zrbat emits a shriek whose echo reaches it 0.0250 s later. How far away was the object that reflected back the sound? hqbker(3j /)gz uxzqp0z4;8n

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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 thul 7qdo,cco 8:-c 7mhde echo 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 fl( wy;-5;23sryv q alpoaoe0 quash of lightning, the distance to the lv eq0 -;a3 pw(au r5osqy;ol2yightning 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 fromr 1lc*4n hdau7 a cliff on 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 h3(qh4 *dq qwlzear the splash 2.5 s later. How deep is the well? (Ignore air resistance, an* wh qq(d4qlz3d 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 frel-7s gi 9 t*lkohl,p8squency 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 ai1u 32rixc2 ram5u mbj(r 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 lev b q*he/ )2p-g6srcipizr.q) q*sal8tel 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 os52p ph(/u nez 1+-7o* co2 putthtkylf 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 sjkm,o5k0ii zl/0:1s wp*lpbkcq 9u2 intensities of two sounds with intensity levels of 70 dB and 40 w2jizlis, 1k0pu:k095 *lk obscm p/ qdB?

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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 dBfxpsbv7j, 1dih 4zl7 0. What is the intensity level generated , 77 0dlb 4jsfivhz1xpby 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 distancejhe at+k jmbww2 m48;; of 6.0 m from a source that is radiating equally in all directio;4mbhm a t2e+ kjw;jw8ns 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 mzt9wtu- )v.xdv (sul6 from a source that is radiating equally in all directions- 9x s(w6zvtv .)tudul 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, whiy6ngpdh j9vk0p(v t2)ch is assumed to be uniformly distributed in all directions. What is the intensity level at a distance 5.00 m frot(p2yp nv v0hg jd6k)9m 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 distu + n e6he*vw:7+/exjn qwq3dml u;a.mance 5.00 m from a barking dog. What would be the intensity level if two identical dogs vqu.:ej +nlew7eu m+nd h/m3axqw ;*6very 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 -vxxue6i*,cglevel is 60 dB. What is the intensity level (in dB) at a *g6u, e-i xvcxpoint 2.0 m from the source? 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 levemxd klue8-ee93s ba.5l 5.0 m from a point source is 95 dB. At what distance will 93 dxlakems5 8e.b-ueit 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 freqm: jqf- m+t.5x8 udx7* pldweuuency of 1200 Hz. What is the frequencdwm-p5xu q+ld .jx u mtf:78*ey 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 ope1;yper6q .jq bf:yln+n pipe is 900 Hz. What is the length of the1.ryfen :bjlqq y6p +; 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 open pipe of length L is o tq+s z+w,t:8bjlna(,u(ji v400 Hz. What is the frequency of the lowest tone that will resonate in ala(sb+,+w 8:v njqiz(to,jutn 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 at0bflyon.5xc h/x nn2+fn3k y 7 both ends has a length of 0.80 m. If the velocity of sound in air is 340 m/s, 3yn2ol.hc7fn/fyx n 5xkn+0 bwhat 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 temp)uvvx5pa5* dg erature 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 atkl66i.6gb kmx one end is 330 Hz. What is the frequency of the third habk 6im 6xk.6glrmonic?

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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 will have a funtbcny2mef; pc3r fr9p4+. vj7 damental frequency of 60 Hz on a day when the velocity of sound isn+rcf4ev mbyftrj;p 9 2pc 37. 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 f. 0smxa+b0lptemperature 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 temp na8/2zktbd4n9 b oxs4erature 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 speed of sound in a0 .2vuw5 my/fcj1igov ir is 340 m/s. What is the fg 1./v jmv50wify 2ucoundamental 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 the oth6gs-w; hhb1b5bcqa z3er is closed on one end. If the fundamentaa 65b c1sqzhbb3 g-hw;l frequency 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 w-dpgr ckiid0s)4( j,g here 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 soun -r d(g)04c,pdkjgiisd?

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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 drige1 0rzlnw xq,e0n9, jven by the same frequency of 500 Hz. If the dist rqw 0e1jnel,x90 nzg,ance 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 and 444 Hz. What is the beat freq,hal 8ljgdk cm46 vtqnm4- )4juency?

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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 m: oj-zx fk3 s(axkel(/usical instrument. If the tuner hears a beat frequency of 2 Hz, what is the frexo:3fxk jk(/( aesz- lquency 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 res54/ mus/jo +f+gpe-seb vlx8tpectively. What beat frequency is heard when the horns /b+8-xeos e5tvgu+/lpsj mf 4 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 o)nk6e ok6b 1o.kr*ie shzd )pi(.v*u nn two violins in an orchestra are found to produce a beat frequency of 2 Hzir) 1kd)ozbe* ik pnhu6nvo sek6.(.* 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?

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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 s4+(o bm (fswo5la it5yource at twice the speed of sound. The observer hea+olf5 t( m(ay54oib wsrs 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 (norm0.gq dyvpsb +hxl6 ,r3.t1 blyal frequency of 1000 Hz) approaches a stationary observer at one-half the speed .bqgpy +ds3v01 lytb ,hr.l6 xof 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 list* /:l+ua7g pd a.k i3mp;xcw1iejwf)j ener moves with a speed of 30 m/s away from the source, what is the frequency heard by the observer? (The sound speed is 340 m/s)7mp dj1wfwu3gp;x/ iljc eak+a*i.: .)

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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-H*vcn:. 559 - cdg:molekefejwz siren. It is traveling at 35 m/s on a day when the speed of sound through air is 340 m/sgkmvlne c-do :95ej *c.5fw:e . The car approaches and passes an observer who is standing along the 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 by a stationary observer when a train app-t3py ,m.dwu w :jv(bdroaches with a speed of 30 m/s. The frequency dj3m:-upw ( vwbt.d ,yof 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 blowsssln8q 4w mv51 its 400-Hz whistle. T48nw5v ls 1mqsake the 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 a stationaryz o 1xxpx::s9f train. The train blows its 400-Hz whi 9x:xzfx :1opsstle. 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, 2em-,r3teukl t+.a oogvey9 you at 120 km/h. The train blows its 400-Hz whistle. Take the speed of sound to be 3lya 9,ovt e.e tog-em+2u,3rk40 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 kf0tj wy( qq8d9t*ra6hkj3/wy m/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 actuaj0ta3y96 yrkj8wfq/d* tq (h wl 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 th utls-.alyfvmhw) /y(xn:v d r*20 /mte speed of sound in air is 340 m/s.l2/(u rt mwhyy:.)vt -s0*anf /vdlxm What is the frequency heard by an observer if the observer is moving 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. Assume the speed of sound in ai2l/t 3b9b :t y:ky: n(bmvjlwhr is 340 m/s. What is the frequency heard b :w9hl ( vbjb3ytk:yml/2t:nby 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. mux plz7bd; +5 m.)wmsA 40-kHz signal is sent out, and a 42-kHz signal is returned. Assume the speed of sound is 3 )w+5p dbmmx u;sm.l7z45 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 s30 xrsd3ns1m:td nqhk p. :c3 o0bw*gdupersonic 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 iq)inl5 9ybsn:xsi:o 0 s the half-angle of the conical shock wave fbs:nxs) q: 5ii90olnyormed?

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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 frkls)n: e4m9 a6bp*zabom the United States to Europe with a Mach number of 1.05 w*)mkal 69bsz:a b ep4nhere the air temperature is $5.0 \; ^{\circ}C$. What is the speed of the plane?

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