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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 sta83 uuffi1wi u6tement?

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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 fastest thro 87j5btuznme1ugh

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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+ke2 ;nf0fz ei 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 happensq afzlf*ya.mfu/2m2 7 to the velocity of sound? (Assume that all other 2 m.2al afmu fq7/z*fyfactors 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 sou re0yn 76(beb5s( vtgznd, the velocity of a 200 Hz sound through ai(7v6zbetg5r(se0 y nb r 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 Hfge:,m;2mo ym z sound, the wavelength of a 200 Hz sound in air, emmo2;m:f gy 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 2 vhymy s:;;3ul(gxjp 8h) (mds0,000 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 frequen+ozx bdw c14m*cy 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 wave+(ac m5jjkt,w s uniformly in all directions. If you move to wk+jtc maj,(5 a point 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 waves246 8:lplsjx(8tck.u q1ucyp g zgci., 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 iu9h 6g9ua hs9ns I. What is the intensity at a distan6h 9shu99u gance 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 is radiating e/ t)yls*-3 kmzf:xj qrqually in all directions. Wfks-r*: q3 x/z)yjl tmhat 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 radiatc6;aqfkm*mvwi77 t 9vn hq;o:ing equally in all direovc k7w: f 7n;qhm6vqa9 mit;*ctions. 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 k bsna7s(gj42c:3i lwincreases 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 t 2qtwc* m6fxt,8 xw(vpone. What characteristic of the sound increasv6cq ,w(xwxt28fm *tpes?

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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 music7xu9 kggw oy / n5;fn8ishj03oal 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 a musical note?,9mlz5 obqu )p:i7gmw

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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 inc iky2 y)/a8xtto water

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19#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Pressure and displacement wavesteyw,*imyh 2 p1jtkm,x 9zz0rz e+2n( 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 0 yv o/t9omj,c4nih p6string and the sound wave generated by the guitar as a result of this vibration. ty io/9vpohc0 m,n4j6 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 mk7 7.6vacwj )q3pe nris 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. Wha:/ awhd ycf)8yt are the wavelengths of the three lowest tones produced by this fw/ )ay8c: yhdpipe?

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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. Which one og*w xmjlu; a9-i)iqf+f the following frequencies will not resonate in thfxju qil)w9g -;a i+*me 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 resonatc:- bzqgin.r9tyt lhw:9 xj6*2naagdp3/6 qfing at its fundamental frequency. Which statement is cordn9 xlf qzt2 c:3gntyb/:9w6.*a i -q prjgah6rect?

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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 whic:dxe .rp-w-n.otz2 bq h 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 wavelengt6i+ 0ac 4gvws* hf ,vcgjq/3a iu33aafhs of the three lowest tone* h6wa3aia cujiv4 afq vg/fs3 +3cg0,s 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 bbm ej 6v:8w 2)v t4b3-khdaukof length L is 200 Hz. Which of the following frequencies wilh4kk- 8a 3e2btbvmb6:uj)wdv l 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 ok:gxmji w1.)p(cb5zauc9x g; pl/lpw/iy.3is resonating at its fundamental frequency. Whici;(b pcg):l 5.lx xwpp/iwom /. 1ugjy3ak9z ch 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 drivenrv vtg*vvk a:rz)gnptr)*8// by the same source. Each speaker produces a tone with a frequency of 200 Hz on a day when the speed of sound irt*gr)g*v akvt)v z 8/p r:/vns 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 suvq um/*6plu4 ound 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 cz iuu+ feg, ui, ;td9n i3eao9x+3r,nand a particular beat frequency is heard. What happe f,ou9dnrica,i9xe; , i z3+nu tug+3ens to the beat frequency if the 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 explai;z kq7o ih2wri44(vksns

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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 frequency heard by thk qyxk/ wm0o(9e observer isxk/mw(kq yo 09

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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 65- zvan bj3mkjk(c d9frequency heard by the obserjz 6m 39b-kjk n(ac5vdver 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 dgk 9z1e :r u/rb,bh+kqz5gxj7ecrease by a factor of:k7 bqr/x ,ek jrgh15bu+zgz9:

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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 munk367 8vf mlof frequency 45 kHz in air is 352 m/s. What is the air temperaturek63 fml v8u7mn?

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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 inlygb p) 8xy dn: 9u26xsvkzs/2 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 bat emits a shro yvwx (i93(0qn5 vzdwiek whose e5 9vq diwv z(0nwoy(3xcho reaches 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. The temperature is p7h +6nvox4ry$0 \; ^{\circ}C$. 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 distxt/ 6winmlj3w8d50y pn6 a:me1r h0 hecj n47hance to the li3e1/ehjmwh jntn468 m5x:dphi6ac0n0r 7 w yl ghtning 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 .df 7j1-*q7zn xr.l: jtxykmp 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 hear the splash 2.5 s later.q-.bx(z/v ukhkez3 +b How deep is the well? (Ignore air resistance, andbhk +3vqez/z(u.-bxk 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 + os hrufi/: gp3,aub,a sound wave 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 at p8b ruot2l (mry6.rd+tjv 0/p$23 \; ^{\circ}C$ 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 levelyl/ c:.deg76yew(dhy,les , e 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-dB soun 8u7i (fwjb2,k wg)ybdd?

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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 sounds0w.vxzrxw m*sh 1wlfph :, ab90 k)q7n with intensity levels of 70 dBvrqlbs:*w .hn hwz70wpx m19,)k 0afx and 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 the intmpa4nc4s1gjv3e8 vk3 ensity level generated by one engi g1eja43cn4s3v vp 8kmne?

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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 disqa*4rmd yo:mg 7lviy6, + kj*ntance of 6.0 m from a source that is radiating equally in all directions iyjlq oik + grv7*:,nm*a6dm y4s
$6.0 \times 10^{-10} \; W/m^{2}$. 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 radiatinmj-zbf rc: /xafj 3/:wg*80 hn0azsxeg equally in all directions ihfs *x/f8 3azg: -wm:en 0abr/0zxjcjs
$6.0 \times 10^{-10} \; W/m^{2}$. 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 tm k4 .ev3bq7lyo be uniformly distributed in a4lkyqebv m3.7ll 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 65 dB at a distance 5.00 m from a barking dog. Ws3 7iokz2 svz.hat would be the intensity lev7.zis3 vz2ko sel if two identical dogs very 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 sourd1 iqr5 ys2uq;g;9hovce the intensity level is 60 dB. What is the intensity level (in dB) at a point 2.0 m from the source? Assume that the source gidr5y ;ouvqh 2;s19qradiates 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 dB. At what d e nfg4vtr;w,2i)wj 6b6nrhp,istance will ivgw 6nh264b; ,f)tjprri ,wnet 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 com;:;jnqmg,n e(qh-9/yhkj d2c9 xwrg7u* lcrrplex tone has a frequency of 1200 Hz. What is the frequency of the fourth har yj29uhlknc r:;7xqg*h/jwrqg -( emdr9,c; nmonic?

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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 l zyq4d *8h5sbis the length oys85z4 bdh ql*f 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 pipe of length L is 40pchf xg( dwyh0.1v*m7a5g/qc0 Hz. What is the frequency of the lowest tone that will resonate in an open pipe of length 2L?cd5pq.v (fah*/g0xg 1h7mw cy

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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 tuwh(qbgd ; ,8ne9ol0of sound in air is 340 m/s, what is the fbugn(t lo0dh8w;e9 q,requency 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 rooa 9zuqg g t6++v,jaj.zm 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 at one end is 330 Hz. What io h66a2 zvlcn/y)xb6ms the frequency of the third harhbzy )n 6amo vxc6l2/6monic?

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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 thejm1 vhlpjx 5*) shortest pipe closed on one end that will have a fundamental frequency of 60 Hz on a day wh)j 5 1vxjmp*lhen 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 h 358tcau sv6ztf(z7ga 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 foo d(gah3p- j j7s,l4in a room where 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 plafs8ac4m d bw8/yed when the speed of sound in air is 340 m/s. What is the 8dc f/swb48am 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 q5:*k, 9z e np;vlj4rhkmq /cfand the other is closed on one eneqkvj 9f z4hlcq, k:n*;rm/ p5d. If the fundamental 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 where the veloztls5c7 2 ,qbf g(tiu2city of sound is 340 m/s. How much farther back would source 1 have to be moved so an oluzqi,c7t5tg2( f2s b bserver 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 by7wa/5qx)qe8u 2b 1wl0rntvp a side and driven by the same frequency of 500 Hz. If the distance from a person to one speaker is 5.00 m and theww 0vpalex 27qb 1)8 n/aqtu5r 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 e)uwocy*rj0 ww- .3l qis 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 o9/0gwykvv 7 riwt 1dt)f a musical instrument. If the tuner hears a beat frequrt7w10v)9i vwktdg y/ency 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 souzd8ai2sew 8fiqq o4*7nds produced by two horns are 6 m and 7 m respectively. What beat frequency is heard when the horns are sounde4z2 *e8qia8sdi7 fqwo d 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 oncg)ctol( (szm0 :)1y+ms wkka 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 same frequez ca)(m0+tyo k()w k slcgsm:1ncy?

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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 soue+cai 5*1n tlarce at twice the speed of sound. The observe*i1 cane5 +altr 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 +g.fxp- x mqyq3h9xt(stationary observer at one-half the speed of sound. The obse +. g9xyfxqpx- (htm3qrver 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 yr6t8ah7o e()ouj jc4 a listener moves with a speed of 30 m/s away from the source, w( o4tue6j87rhc)jy aohat 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 8ihb6 oiwq5+ d000-Hz siren. It is traveling at 35 m/s on a day when the speed ofii bd 5w6+0ohq sound through air is 340 m/s. 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 bd gkwm1h dr7o +(d.nubk8i)8fy a stationary observer when a train approaches with a speed of 30 m/s. 71.ndhb drk8+kfw 8(o dm gui)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 12g7b47zr/ nwwy 0 km/h. The train blows its 400-Hz whistle. Take the speed of sound to w z rb4wg77/nybe 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 tra9czfkv)ox* 4 qin. The train blows its 400-Hz wh )k4f* 9zxqovcistle. 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 blo+0 ash9ob r:g s-ekd+wws its 400-Hz whistle. Take the speed of sound to be 340 mhr+skbg +0w9 ae: od-s/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 f5 j yc-1x4ablqvkd .e0rom you at 120 km/h. It blows its whistle, and you hear a tone of 400 Hz. Take the speed of sound to be 340 mblak j45 vxe.0 dqy1c-/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 speek5 rq r5xvizwk. ew*-)d 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 k5*qri r)wxve- k5zw .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 ise)4fzul 9v4ix:zx/ yc 500 Hz. Assume the speed of sound in air is 340 m/s. What is the ff ic49z z)4/yvxe u:xlrequency heard 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 ahq89 fs(gew. an object. A 40-kHz signal is sent out,e9sq(g8hfa w. and a 42-kHz signal is returned. 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 w4-5rb2 bqcvcn w8)rudave 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 speed of Mach 1.4. What is the half-angle of thesrq3( 6 whv lfoa2;ek) conical shock waveve2r s;qfk3h (a6 )olw 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 fli0d;ow37 bg: d3 cnsc 4xohdfu1es from the United States to Europe with a Mach number of 1.05 where the air temperature is wn0c7ddd3c1x oog3bs :uf;4h $5.0 \; ^{\circ}C$. What is the speed of the plane?

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