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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: 游客未登录  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 falsh+*16jt cwzjh e 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 fas .ro3diy,mu6stest 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 s:nb3yy: qq p0)ljc; qsteel 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 o9fm-yv/ /pmuo ;m4mf to the velocity of sound? (Asso9m u4pm-v/fmyo;/ m fume 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 20scam,z1 :xb/ cpw(3dq0 Hz sound througp1/,s c a3b w:qzxc(dmh 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 400 p03mx yyqas be 03,xt0Hz sound, the wavelength of a 200 Hz sound in ai mb0ye3 3a,p0 x0tsyqxr 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 greatab8an3l6z7rz/ dt3i y er 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 les5 c l15g ;f*gwxcr66dd4u6c4i: vn9isql kyjms 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 emitting waves uniformly in all directions. a9otr /qf(el. If you move to a pointqlf (r.a/t oe9 twice as far 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 dmv6ecy( t *l9gr t;hp;a32edproportional 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 distancebz op)p fvv,x/oy6p4 jv+bn wy:d ))7a d from the source is I. What is the intensity at a distance 2d fr/ ) zapbvjvyy,o7n6x 4)wp:o+b fd vp)om 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 rwrwb+g yu(*( from a sound source that is radiating equally in all di((wru+ rywbg*rections. 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 radiccw+2eo8:p/ l 9darn zating equally in all directions. What happens to the intensc2d z a+:wn8l/pcroe 9ity 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 sound becomes loudervvr53/jkd .i/ s dup3lyx35zi ?

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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 pu(qo (lrl+hiuvs2 m 0 j7evo)b1x*sw.m re tone. What characteristic of the sound inclvmh12iu em (+(0rsqo v*)7bws l jx.oreases?

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16#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What determines "louc v3;kn 3(oocsrh(d vu, duo sx(91q:fdness" 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"a4fg yt.a-e l7 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 was*wn*x 6 os9air 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 displacemen9zec(pb.y36nvju : 9lx8q9p -w uc(ksnh9vent 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 guk 9wxqqpq8yqe5xt8cd2ww3/r5k* 2kz itar string and the sound wave generated by the gwk rc2qtk 95q5wy/q83pkd8 wz*2xxeq uitar 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 which is open at both endhsnd17g(vwy v1 t(l8f s, 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 of98cej(q s ,8f;hjz s z;reo(qu length L. What are the wavelengths of the three lowest tones produced bjshc(8z8, zq 9oe q;;rf ju(sey 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 lengt;r g-rshw 4;n/ 0daok9 ijlx.yh L is 200 Hz. Which one of the following fkji;xns.r;h/4 dw 0-ya9 ro lgrequencies 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 u3ci glg1t/i+its fundamental frequency. Which statement +gg/tci31 luiis 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 closesri;7 up)bd h;g:w fh;d 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+6: plu glxgejb87)ao length L. What are the wavelengths of the three lowest tox b ul7a 8p6jo:eggl)+nes 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 23dsc ))9zd dhd00 Hz. Which of the following fr9z 3ddc)d s)hdequencies 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 resona6ez *7m( sunbi,x fq2oyg ,5fcting at its fundamental frequency. gu(2fnz*iqfyx,7os , 6eb5c m Which 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. En10ongbdtn0 er7x9fq wa7 j.3ach speaker produces a tone with a frequency of 200 Hz oe9fg da0r.jx0 7 7qonb1 t3nwnn 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, th2jgi27(revml f(d m4og6q1 x he 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 together and a particular beat8u1/d4zf ghv i frequency is heard. What happens to the beat frequency if thh 8/4ufv1 igzde 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 expewr18/a x/m,f ma;oxalains

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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 freque4a3 t6-xcqcdw 7chtx /ncy heard by the observ/hc 3xtwx-6 4c cq7atder 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 8rx gu0 )qb ek+,pq2nnobserver. The frequency heard by the observer is )erqbqn8xk +u0p 2g,n

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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 decrease by a y7- u2u 1 e+bxdolal9cfacto udlu-e 17abxoy9 +2clr 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 s+-fyju:f; gxeuam84*ed n(o u ejy;/nound of frequency 45 kHz in air is 352 m/s. What is the air tem d(- ujo x ug:+fnufyane;j e*4ye;/8mperature?

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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 3wt2xv-a: p pkfm4qv(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 sound in air is 340 m/ ) v9afr8f q77t,hzsios, a bat emits a shriek whose echo reaches it 0.0250 s later. How far away was the object ths,q v97hafrft87iz o) at 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 temperat qx wt;9v/ aqh:y2;qxyure 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 a9x * + a0xbkgqfi6msg6fter seeing a flash of lightning, the distance to the lightning strike is abox f0sb+qg9ga6mx*i k 6ut

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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 temperatxb (8lhhp3 h/mure 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 splash 2.57 4p)rs tpz8,zpe3fzj s later. How deep is the welfe zz7jprt8)3z, ps p4l? (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 wasya3e7ogv s.8z ybnq/ .et/ 8etb6x 4ave 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 airtn,(yv+y8qf o 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 with intensitt4 tm0pp/m pa+y $10^{-3} \; W/m^{2}$?

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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- 3zcs5ta..+fru 1ndtqdB 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 with intensity levels i 3bvjqr(9u7 e 98xmqtof 70 dB and j7mxbvt q( 9e 8iqur9340 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 enke t1f-q3u 0keu) i)gr4inrn)5a 4ju ugines in a garage is 100 dB. What is the intensity level generq rka in4jg- ne e5r)uk u4ut)iu103f)ated 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 distanl5z 0kuv;vi9wce of 6.0 m from a source that is radiating equally in all dizkl0iuwv5; 9 vrections 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 di qfiq93n-zz1mstance of 6.0 m from a source that is radiating equally in all directions iz 9fn-31m qqzis
$6.0 \times 10^{-10} \; W/m^{2}$. 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 to be uniformly disv1-q34jyu xofx mh/ f-tributed in all directions. What is the intensity level at 4/umyx -x h-jvqffo 13a 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 distance 5.00 m from a bafio:b+ yddl* ,rking dog. What would be the intensity level if two identical dogs very close to each other are barldb+: fi, y*odking?

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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 from1ybuy- l7.xfb a sound source the intensity level is 60 dB. What is the intensity level (in dB) at a point 2.0 m frob7uf1b xy-.yl m 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 level 5.0 m from a point source is 95 dB6 td8cmhzolvej4)4d a spj(k*80ty y). At what distance will i)6vy4c zeo ta s(d0d4 hyptk*j )m88ljt 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 ap9g )uuqoem. ad7(,94 qmo*jfp qpou: frequency of 1200 Hz. What is the frequency of the fourth:pd.uqp,p)qgqu o49 mo 7( ue9*jmfa o 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 2 0 ql6pboe)ra900 Hz. What is the lengto 2apr)60l beqh of 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 open piq(t cx4t29p :s-qojskpe of length L is 400 Hz. What is the frequency of the lowest tone that will resonate in an open pipe pq-kxtc9o s2:jt q( s4of 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 2/nl)r i wvzi7 nb,gh8length of 0.80 m. If the velocity of sound in air is 340 m/s, what is the frequency of the secondg /hbwi riln2z7 v8n), 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 tem9w ihk :2 jijqgd f(*kqk6o2f/perature 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 agk(7k 5shwia,t one end is 330 Hz. What is the frg5(a h ,i7wkksequency 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 on feyffig l2xrvo)+53/one end that will have a fundamental frequency of 60 Hz on a day when the veloei fxrv+5)gf o/3f2lycity 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 wbqlr9d9xr7z i(u(tt 3here 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 the temperatlk 0 w*ii,5abwa2 9snhure 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 lsm so 82c+ i6i3n*mq)8dqlu zuo7i(m m is played when the speed of sound in air is*is6dz2i +nmuc mou87) q8(m ls3iloq 340 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 length: one is open and the other is closed ont442zas* o++ 30u;xn wn q7nlbrn ahpv one end. If the fundamental frequency of the open pipe is 300 Hz, what is the fundamental frequency of the cr0h 4azqlwsntun+2 4+ n;a37 xvbn *polosed 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 freqlyrqvbo vne3,.* f 7oi2mlz41uency 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 sournf qoy2eorzb 37*. v4 ,1mvlilces 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 same frequency of 500 Hz. sojprmm yxk3h.. xyn1;)k3eo 41zxz9 If the distance from a person to one speaker is 5.00 m and the person det . 1.or1 hop4z sxm9kjxkzxey;mn 3)y3ects 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 6(vp1oid71wecjz1ft lvqjcx;o ;j*2 440 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 a msk-l6 ga1hph hbtmv7 i :t1*rir-5w t(usical instrument. - *lr(wt6 bmrt:5pha-h1k1iist7vgh 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 soundh*ajz1o ,x.vg6.manl y0k5li s produced by two horns are 6 m and 7 m respectively. What bexm5 a0kgazvil. 6h,1y n.jlo*at frequency 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 strings on t uk/5: 7k-qjgdx0l05 sg0fnddiec( whwo violins in an orchestra are found to produce a beat frequency of 2 Hz when a frequency of 660 Hz is played. What peikh- 7ng/kxf5 eqddl5:dgw0(js0c u0rcentage 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-Hat 4wdb5xlf9z x9 av;5r,epo 8z sound source at twice the speed of sound. The observer hears a frevr;w ,5do9ae4 fazxx59lpt8 b quency 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 observe(+.yf:iovw n 0b-l curn;:ugnr at one-half the speed of sound. The obs:vrnnf0 +y (l:bw .ug;iocun-erver 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 mov5o ggf7 i54,xg +djgzdes with a speed of 30 m/s away from the source, what is the frequencz57gdg5gio g fj, d4+xy 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 is traveling at 35 m/s ovxsj*04x jv4fn 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. Wh4*j40xsvjx fv at 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 whe: 2:cl (kh8owtaubw *btir 0i*n a train approaches with a speed of 30 m/s. The frequency of the train horn is 600 Hz and the sp(:0wkiobt :b*l uw2cht*ra8i eed 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 a myz: s08gospt* o-miht3w6 t;t 120 km/h. The train blows its 400-Hz whistle. Take the speed of sound to be 340 m/s. What frequency y:gtzthw;m omtsip03o-s 6* 8do 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 blowpsg; ;8mdg)x:yde;j gmt 7; uzs its 400-Hz whistle. T8sx gmt;y)z:;; j 7gumegpd;dake 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:72b /oev3(prrru7l at v5ho p from you at 120 km/h. The train blows its 400-Hz whistle. Take the speed of soun (ep5 rv2op ur3vot/ lha:7r7bd 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 fu3zwo8sv p5z 6ls 86zp3dzn. qrom you at 120 km/h. It blows its whistle, and you hear a tone of 400 Hz. Take the speed onp.3vzlqd6zus8 zz8s6wp 35 of sound 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 H/dny1s;1.ctjf e q0 rmz. Assume 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 speed ostjyc 1nd1 rq0 ;.f/mef 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 air i o15eypw21o.r wwxv,saqb.(rs 340 m/s. What is the frequency heard ba5,rp1rs. 1w .(bq w2ywov oxey 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. A 40-kHz si sqhju2k wtja2j*s:o0nvc x.: k5gw)dj 0:jq-gnal is sent out, and a 42-kHz signal is retwowg2:t ju0 s :n q52jkq*s a0j-j.kjx c):vhdurned. 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 wave produced by a suped 2wqqx:7,njmrsonic 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 hai/b07f7 ry *rwjys 5chlf-angle of the conical shock wave foh0cfi7 y57rwrsb/j *yrmed?

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87#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The Concord airplane f9oqz vwgb;/7 wlies from the United States to Europe with a Mach number of 1.05 where the air tew7v gw /qob;9zmperature is $5.0 \; ^{\circ}C$. What is the speed of the plane?

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