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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 m.b .9lqiao/(2ggg +xm qnw+bstatement?

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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 conx* w3wcu (o dgtpdo)38(ga)zs ducted 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 rod?7 qc3yv1n5cydrb w1 *k

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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 . 31k p)kq2l2iijfc 6i8zjoz vair increases, what happens to the velocity of sound? (Assume that all other factors remain c8okvl 3jzjq f.i)k2z 1i2i6 pconstant.)

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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 of9zn4c* 8m l :acp(nowb a 200 Hz sound through c* p onm:c8wb l4nz9(aair 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 ofjyj(n,a c4jan7sgjyh +19,ny a 200 Hz sound in ai9nn+jj, jya17scg y , yj4n(har 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 are ;e n ihdq5q+y7o3;vz gcalled

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8#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Sound vibrations with frequenfclek+rcx a-i 8oe6f c /6-3imcy 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 source is emitting waves uniformly in all directions. sa ;+wimhfr+8If you move to a point twice as far away from the source, the frequency o ;+mriwf8 hsa+f 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 diverwbm5,:g2kd xn0 ( wnbnw4 q*igging 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 pointqi 38:q*c gmt0qs lrp+ source at a distance d from the source is I. What is the intensity at a3 rcqtq*0 gp lq8is+:m 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 sourc idp+*gwtd 56ve that is radiating equally in all direcd vdtg5i+w*6 ptions. 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 adoz 3vz *;z1fx sound source that is radiating equally in all directions.3*;xzf1ozzvd What happens to the intensity 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 bg :9uhv6wced6 ecomes 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 sp9-jx8 e8mmb*pcmds s;eaker emitting a pure tone. What characteristic of the 8 8xspmdm-j*bec; m9 ssound increases?

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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 notencm , ;rm:ou1u?

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17#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What determines the "pitc kn ad.p//6lo4vz f8b. *hlyzzh" 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 watea.a wq +5kt urtcy1.q9r

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19#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Pressure and displacement wy4gp.; pxgi3 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 wave generated by ,hyehgzd+u49cvr e08 the guitar as a result of this vibration. What do these two waves have in comm eud g8 z9+rhehcyv,04on?

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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 bb32syg /kg6jtyt+k;. .u:w ljhp 4nh 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 wawii;5 kvrme29velengths of the three lowest t;m irk592vw ieones 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 of length L is 200 Hz. Whicuyhr bg+v)/ 7oh one of the following frequencies will not resonatev/ryb+)houg 7 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 petarr(9upyr s)dz 40v0h3w ys0qx.42p xff2 resonating at its fundamental frequency. Which statement is corrhf pq2wy) r9p4302 dyptrv xesz.(f r4u0x 0saect?

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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 whi+5m6t.lidv 6s xplh:1n wkmg.f+4 o nhch is open 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 tcgf wvbo.f(ks773ewe/ .b r0i hree lowest tone.k cwfbi7og(3ve rf bse.07/ws 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. Which oio o ;j kmgh61 08;nuf5mqkiy*f the following freque1g hkq0ifu ;iy*8 knj65oom ;mncies 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 z lbkrrd3a223t32 f07tcjrkshd k5.m one end is resonating at its fundamental frequency. Wh2l3tdrkstbc0 j33a rmk k. 2d25fz7hr ich 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. Each rmv 4:mz o8 1t1xop0vaf:/rdgd/ avx(speaker produces a tone with a frequency avv(dzx14dr:a08g / pt 1vo r:m/mofxof 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 tgq,qo 9dz2r 2uwo 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 beat frequency v 8ejz*pva q c*u*22unis heard. What happens to the beat frequency if the frequency of one of theu8uv pae*j2*2 c *vzqn 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 exe l:2g0jqt h*ckq:or e33fo r0sx-)nisiz( z4plains

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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 stah4e jtki35iv5 tionary observer. The frequency heard by the observerikiht3 ej54 v5 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 frombhn w/f8ysl3e+h rj 9; a stationary observer. The frequency heard by the obsenew8r+/hsb9 3j;hlf yrver 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(; ;tcm8ff-7fk bnlj q MACH-speed, its half-angle will decrease by a factor 8jnt;b-fc;( 7fml qfkof:

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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 3:ax a,o8;4g7,r yjqd) xdfic r52 m/s. What is the air tempe;g ddf7aax, o8)r y:i x4cj,qrrature?

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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 soz t/n6)r1k yzyund 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/s, a bsfldvt 8hp-:6at emits a shriek whose echo readvps8t-:h fl6ches it 0.0250 s later. How 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. id8h*;o:hbup+*nk s zu3rsx) 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 flash of lightning, the distance jkj5ty8d7r 1 uto the lightning strikjt5ud8k1 yr 7je 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 dayltn n9w0g im4 n;-q8xv 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 splash 2.5 s laterj rl9h vg :5m+nw.(cbb. How deep is the well? (Ignore air gbm+l 95n.: r(wcvh jbresistance, 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 500q s9ypy2x/ vd7kx ra jro6p05w3qff+* 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 yqwb*nf6q(a 3r 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 /+aby kdja-b( 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-dB.4)g7jfl0 y4x:b brzl m fngj jg3d3a1 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 of 70 dbv9*spt.2 d u*0h baa6 3vi.qvq-itki B ait-iqvd36t b.90.us *vb2a *h p qikvand 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 engines in a garage is 100 dB. What is tt 1l0d0qofuo *he intensity level generated by one engi*u1f0qlo tod0 ne?

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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 so,hgz:3e-zew j 5+gs jyurce that is radiating equally in all directizg jeew -j+h3sgy:, 5zons 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 from a source that is radiating equally fo ;sdu.bzl+ +in all directio.+s;lz ufdbo+ns 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 abov nnlk,61cy 9*xgo*aku4 q*e jf7h 9x3qwkkp9ut 1 mW of power, which is assumed to be uniformly distributed in all directions. What is the intensity level at a distanja,*4 *qweqkxgc91l kn79v6* 9xfyo unh pk3k ce 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 barking dog4 eqat atkp(6v1gs8f*g9e;r1 y tdvc3 . What would be the intensity level if two identical dogs very close to each other 498d3t k1 rc(6q *af1;paet styveggvare 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 i5ds2q6 ,dfiaos 60 dB. What is the intensity level (in dB) at a point 2.0 m from the source? Assume that the source radiates equally in all directionsq52i6o,dsd fa.

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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 sog*k (i7:v leiiurce is 95 dB. At what distance will it be 75 dB:g7l (*ekiiiv?

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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 the fr 4lp-br;4zdlb equency of the fourth hdpb4b 4z lrl-;armonic?

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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 har8me3s3 fz4 39szg x,jd 4diuinmonic of an open pipe is 900 Hz. What is the length of the ds f8jx,izdeg 3i3mz394u4 nspipe?

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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 pipu*dozlci 1..ge of length L is 400 Hz. What is the frequency of the lowest 1zi.c od*ulg. 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 lengtw6ho m4igtv2d:ci*8h t(yd g 2h of 0.80 m. If the velocity of sound inc hvo(dm*ihig y4tg2 w8td:26 air 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 bbiu8f 272 xgi.;(yava/dx zxa 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 az)v z 3g +rrbqi(6v-oq pipe closed at one end is 330 Hz. What is the frequency of the third hab +z6iqqgo z-vv3)(rrrmonic?

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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 en-h5wio)dzi1 m d that will have a fundament5 ziod)-w1h mial frequency 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 where the temperatvc+9us20gqcyl2 .n zlure 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 tempezsx640)v *g x(riqfj;wz+kmkrature 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 aiob+/bo8r, u*tcbct: mr is 340 m/s. What is the fundamental frequencyt+/r mbb,t 8:c bu*coo?

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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 h)w+04kjqa 1 ao ;p*n5 bjqgyrsame length: 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 the close1j0q*ya4)5 ah nwj+g;kbr q opd 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 ek5ab 1t4v d0vctrn:--xgefa4 ;i/umvelocity of sound is 340 m/s.d-0;rx mtcfa:t/4vn uve5e4kb- i1ag How much farther back 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 bygl eo4 z*mvv1 xshl516 side and driven by 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 no sound, which of the following is a *1l vsh5zl 4v g6me1oxpossible 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 Hhbo2reo)vy9 k/+e 9bj 9ihz)e aec0 e4z 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 tuneqy ) /up wg;+p1/y zlqftp+6gg the frequency of a musical instrument. If the tuner hears a beat frequency of 2 Hz, what is the freque+lq / wpgy+q ;g16gty/fpuz)p ncy 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 a tkxb*:+(fzv5xsel4 1pn a4hlnd 7 m respectively. What beat frequency is heard when the horns are sounded on a dafnp1:xa4+ thz5 *xle(sv bk l4y 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 vioqwvg1oz 4:dihd h 8g9 /zoy5x2lin strings on two violins in an orchestra are found to 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 s4:dd go 52q/xyhzw 1v8gzho9iame 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 thtpog*1y rprn1 /orku4lp 6p93q(f4rme speed of sound. The observer h pqrgkpn13ompt/ 6*upf4(r4r19lyr o ears 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 stati)n*; m :7hje shfik,oxonary observer at one-half the speed of souh: f)ojimnsxhe7;, *k nd. 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. Ify6vbhn 4/ *lrf 7q 5kchhrj08r a listener moves with a speed of 30 m/s away from the source, what is the frequency heard by the observer? ( 78krrh6b*l hvy4qcjf/05hn rThe 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 isr 0mz..r0yv 0stmae,y traveling at 35 m/s on a day when the speed of sound through air is 340 m/s. The car approaches and passes aam .0m ystr0,rv.y0zen 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 awb5-fpkg r: ca3; zhoar)muj i* 4j5z; train approaches with a speed of 30 m/s. The frequency of the train horn is 600 Hz an*pu3 ig5):5mj ; f brr;wa-ckhzjo4a zd 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 tpmp2 jfkc-v+/oward you at 120 km/h. The train blows its 400-Hz whistle. Take the speed of sound to be 340 m/s. Wh pk+pfvjm2-/cat 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 statig x*9wp )xqgnp1 ngl;amj .ij3407hyeonary train. The train blows its 400-Hz pg7j 1ng wg4ja ;m)q3l*epxi x0.nh9ywhistle. 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 you at 120 km/h. The train blows its 400qi+q*40 lgz*rr*t-s hi /aj/-ft njyu-Hz whistle. Take the speed of sound to be 340 m/s. What t0/r q/*i-n4jgqh+*-*yflz j t riaus 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, and yok4z gghh6noa2,04ifdu hear a tone of 400 Hz. Take the speed of sound to be 340 m/s. What is thna4g,oz2 dki0h f6g4he 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. Assud+;fyy ifs;i cqu ml; 9eid 86k1s+j-rme the speed of sound in air is 340 m/s. What is the frequency heard by an observer if the observer is d8 s+i+ s6cr91i ld; mfekj;i- fqyuy;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. A2i;g2ccoih, - llg )cxssume the speed of sound in air is 340 m/s. What is the frequency he2chi- lcig,o g2xc;)lard by 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 signal isja wd 9yeh+5zs8g -m:r sent out, and a 42-kHz signal is returned. Assume the speed of sound is 345 m/s. How fast is the object moving?-gazm 5 d:8h+y9wesr j

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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 aircraft is f( z9 ujjsrsixeb8)2 6$60^{\circ}$. 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-angle47azmekt4e 2+(u 2 ywdt dx)af of the conical shock wavuwztka d 2+(4xeyt2m ) eda74fe 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 fr*p7ywlag d k04 :kjjy3om the United States to Europe with a Mach number of 1.05 where the air a473yw*kgj0:ypdl jktemperature is $5.0 \; ^{\circ}C$. What is the speed of the plane?

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