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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 u ii/8iwis :0kis a false 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 fastes*s7.cc rr0c folg:uaxj*;fz . t 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 jybewn3pa4o f0 )68 pk;q:kje 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 velocity of sounr,rgjgr/s2gh h1z (ssus ,,.w.si/ tyk6*mop d? (Assume that all other factors remain constant.s6(.,rw,p1 shrogghitjz/kg 2 *sssr y. um,/ )

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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 sound q9pc/6vsx 0 igthrough aiv0 p6cgx/i qs9r 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 of2j ly7,6smn q/dwfy(t a 400 Hz sound, the wavelength of a 200 Hz sound in airqy7 yjfn(, s2dw/l m6t 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 i-n*rk,-rls 9 zrw u4xcalled

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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 thaz xf7ixsm. nj)7w+v(nn 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 vl v7aen 212+ksa neb)uniformly in all directions. If you move to a point twice as far away from the source, the frequency of the sound will b2 sn2b lakne+7avv e1)e

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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 g/2sx j v75y6rzkk aim*yco9/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 Iy7 n)(-fmq myb. What is t)q my7ym- (nfbhe intensity 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 isq jjmw8 pcm jc4862rw0 1lq-5+qbxxxc radiating equally in all direc6 qj8-wxm+ w qbmxp5cc0qxrc284l jj1 tions. 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 radiatingta*i 283f;fsnf ,n ) my4pqkazqdd8d3 equally in all directions. What happens to the intensity level of q,;2f8d4*f38qia pd ktnf zy3ads) mnthe 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 becomldo)1.9ksq fa0d gxd/xn0 .htes 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 characterist0,s3k-qr q: aw hv9byazw:x+hic of the sound s0q+rvqaw9: h:xw3a ,hz kb-yincreases?

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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 musicali nad+ggi59 3g 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 notp4vei.l+ta)l2cf i 4ve?

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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 ar63 absn53j i7lql i:pir 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 displacemsehx7j6b tj,u7u,; cment 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 soun 4b a)h8dpk)rlo xkt-ga8z-j2 d wave generated by the guitar as a result of this vibration. What do these twol-ahk) gjto)p4a8 zx-2 8kbdr 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 ends, t4k(m / h,czsl6ouv0zzd9 r(he here

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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. Whaoku,-ijt mm (;t are the wavelengths of the three lowest tones produc; o j(t-,kimmued 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 a 68zcoa i+sbm,n open pipe of length L is 200 Hz. Which one of the following frequencies will not bo 6,8zsm+ciaresonate 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 ah+)n8 ffgy8(p hhda3 ht its fundamental frequency. Which stateme+fa nyghhdp88 f3h h)(nt 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 twyskmqh/2ey:lo+ w3 4he 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. Wh-j- a je:8q;7+*kv48 bw- knswidfw aym/z ctsat are the wavelengths of the three lowest tones produced by this pi by7wcjjwt8 e4qv-si:8;+akfk w-*z/s ad m-npe?

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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 5fy iv4oxm((d in a closed pipe of length L is 200 Hz. Which of the following frequencies will novxd(4mi f(yo5 t 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 lq:u-e)0 lmk drn1yja ap;; 8te8rq8c resonating at its fundamental frequency. Which statement ljktec8;8q p alu m8:0-ydq)rn;er1a 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 betwe eaq)ohoi/x)lii 3:z .en two 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 is 330 o qhii3li:)/exz) .aom/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:b10,cjrg+ fgp c svk6 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 togkcb q,2gfq s7edu p)-+ether and a particular beat frequency is heard. What happens to the beat frequency if the frequency of one of the tones is incrd)qb7 gek-2u,spfq c+eased?

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32#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The Doppler shift explain (lm+h 12b ,tzlrrzt0ls

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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 heardtrxj v/v2 d kjohr2jh x;9,vde+5.*ho by the obser*hodjvv5jtrh +xk,o2 ejh92 /;vd xr. ver 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 ssft p,48*udm5 rol/cy tationary observer. The frequency heard by the obserlc5 ps fym*8ud4 ro/,tver 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 decreasw t.qih-jbc aw6(ny ;*e by a factor abnj ht6.-qi yww; *(cof:

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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 m/s. W8kvwzlb6 m21d 0p9 tdzhat is the air btvz1mpl0 6z8kd9 dw2temperature?

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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 o lkp) un(4vtm1tyd4b *f 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 air7 uhcl l.m9ew zdw ;/4dvvk82cug+aj*bc/c2v is 340 m/s, a bat emits a shriek whose echo reaches it 0.0250 s later. How far away was the wcz2vl8bu+mcveludhv 4 cg9 /;a7dc2 w*j/k.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. f(c.gohwp(kx +;* + 8 zjfoxjf 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 distanesp eh)3d 2 eq-(wp8meyqkj.z0j-)wpce to the lightning strike is aeeew3p8z-qj 02we hq (.dkp)jy-mp) sbout

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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 2.0sq; 7qlqdu p15)fl ai. s from 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 hear the splash 2.5 s later. How deep * +y : e1qki+jro-mqwlis the well? (Ignore air resistanceke +iq*yrwj-o:q1 m+l , 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 ofwol* 4a 1qcvn2 o8zsb4 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 ai. -2ghrvl7ytij5. :d amh*dycr 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 dnz)dw1loo )+c nlw*0d ym6d5a 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 omeqz 7j: /wx:p6n2m fzhi,(qhf 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 intensities ofziiwxj4 0qbuss.5 . j4 two sounds with intensity levels of 70 dB a..4i zxs j5qi bj0ws4und 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 . 1g6 v*0ox.oc ekjrknis 100 dB. What is the intensity level generatkoe x0n1. 6v orj.kg*ced 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 distance of 6.0 m from a squq x-,2fp/ 6 sb k bhqovvvr/9wq/1(nource that is radiating equally in all hvb vq69 /pwr,2/1 o/-ux nq(qsvqfbkdirections 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 distan6 nznt.3il12wnj xlz )ce of 6.0 m from a source that is radiating equally in all directions isxnin)1 lzl36 tjn.z2 w
$6.0 \times 10^{-10} \; W/m^{2}$. 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 po,c.v egf5 nn*hb53k )7ts radrwer, which is assumed to be uniformly distr h,b*snkc5.73dvf5)n rg aertibuted 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 65 dB at a distance 5.00 m from a barkinge14fr p)cf(qu. lksr( dog. What would be the intensity level if two identical dogs very close t4 1.frqf(uckr ls)e p(o 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 levjh5).u 3sfuyk el is 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 dire3 y)uuf.jkhs5ctions.

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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 distanzk(k h/paju 38/a18ht vn2fasce will3 za jhs1vp /ukha(n2 8a/f8kt it 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 comploous(q:oi 0, oex tone has a frequency of 1200 Hz. What is the frequency of the fouo0(os,uioq o :rth 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 :)nuxwnm0l; v pwmdla7s:un8m)2 y )eof an open pipe is 900 Hz. What is the length ofvl2:) num)w7)w:8s axnnlymde m ; p0u 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 400 Hz. What is thef 4okc 5.7kg3m4xpcs s frequency of the lowes37k.cpmskc4 x4og5s ft 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 lengthj;f54k yzeqnme . +m)r of 0.80 m. If the velocity of sound in air is 340 m/sz 4f;kemrq .jn+e5)ym, 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 temperature is c1p v62f0rt3(bcncq9*8 ohfl,fo d zm$20 \; ^{\circ}C$. 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 sdmt :7p 2 4 6y8yfdwfj9p9bk:y -djlais 330 Hz. What is the frequency of th w7d::y y-9 bfptmd642jdyj k9asfpl 8e 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 one end that will ha;rhq0x d isig6zp9-5 cve a fundamental frequency of 60 Hz on a day when the velocity of sound iixgids0-pr hqzc 6 59;s 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 temperatubqu(dxdd 4b4/re 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 temperatur/df; xztdbi1 9:ko zv8e 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 b hf3mn hbj--5r7zez3speed of sound in air is 340 m/s. What isb -z7 -35embrhj3fnzh 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 issge ax:8,i i9z open and the other is closed on one end. If the fundamental frequency of the open pipe is 300 Hz, what is the fundamental frequenx8:,z9sgiaie cy 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 frequencyi96d zz, 4p,i l5ctdvd 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 sources wii dlz v495t6,zdpd c,ould 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 frequencmx 1x ij9lbs(;y of 500 Hz. If the distance from a person to one speaker is 5.00 m and the person i;x9 lj(1sx bmdetects 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 frequenci nr7v nm(mx:q)ev /y/yes of 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 vkwf z.v4/c2ft1 t2ldtune the frequency of a musical instrument. If the tuner hears a beat frequenc4w ld22z/ . fkvtf1vtcy 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 so+2 zb/+ yxobmaunds produced by two horns are 6 m and 7 m respectively. What beat frequency is heard when the horns are soz ++ 2mbboxay/unded 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 w8z0tl/ z lnj f+j1mt*orchestra are found to produce a beat frequency of 2 Hz when a frequency of 660 mtw1 n *ll8j0f/jz t+zHz 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 a5n e/;. pl;o/e- gryc./rjxp 1mrgqh1000-Hz sound source at twice the speed of sou-er5. ;q o1/p.ph ygnj//lm arx;rg ecnd. The observer 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) approacbj-im i+5m xq s;j4p2yhes a stationary observer at one-half the speed of sound. The4x 2m5q jbpi si-;myj+ 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 listener moves with a s1rc8 j0v x.mn t)nz3oqpeed of 30 m/s away from the sonn 8) ct.0mox31 vqzjrurce, what 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 800-Hz siren. It is traveling at 35 m/s on a da,h;xg.5 jb 2(hlnwf2x29tzukh*g mc h y 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 freque.5n *k9z22luhwh jc;mh2 gthfgx,( bxncy 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 approaches ;*7 kvcvm(i:uh4 mivdp 5t8spwith a speed of 30 m/s.h c7smipv(54vup8tm;: ivkd* 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 120 itu/ t1a5m-8(sdjyug km/h. The train blows its 400-Hz whistle. Take the speed of sound to be 340 mu m(s5uy 1i/j-tdg8 ta/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 trainzg, el9bb**vr)ycs7 i. The train blows its 400-Hz whistle. Take the spb,byrgi **sce l7z)9v eed 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 yo qp z/s8tutfv e29fh* 43f9qoou at 120 km/h. The train blows its 400-Hz whistle. Take the speed f h*e8q/32stopz9utvf qf4o9of sound 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 from you at 120 km/h. It blows*:er+ h y5w1 mvtnfqq: its whistle, and you hear a tone of 400 Hz. Take the speed of sound to be 340 m/s. What is the actual frequency of the whistl m w+th1rfq:: yeqv*5ne?

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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 td1(-jwa sf2gi16 cs1twk bf9yrain horn is 500 Hz. Assume the speed of sound in air is 340 m/s. What is the frequency heard by an wkc9t11(ify1d -b6j2s ws gfa 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 hoq1ygy,c. stk2 rn is 500 Hz. Assume the speed of sound in air is 340 m/s. What is the frequency heard by an observ2q.,1ykcgy ts er 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 t kj)c owacma;/ h6/o1ahe speed of an object. A 40-kHz signal is sent out, andhkc)1o/ acam6oa/w; j 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 wavej )/d g39+cp -klbps qoi6tqq8 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.po zn *3whdk3ht1yy6 (4. What is the half-angle of the conical shock wave hy nh*3o3kzt d61 wyp(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 thyuc 5; sc0bby/1ac )ybe United States to Europe with a Mach number of 1.05 where the air temperature is 5b1ysc;bb a y0cuc)/y$5.0 \; ^{\circ}C$. What is the speed of the plane?

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