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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 falsekl*+; j*( lme+dfoyti 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 is4o q)hxm7l qqt3f/a 5s conducted 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 r wisvw079vb-i - d(qda 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 sonp3zpb 6(dv0) 1kgzbjund? (Ass)0gdjbpkn6zz3 p 1v (bume 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 gp15cfel ej 0(200 Hz sound through air f 1gj0e5p (lceis

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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 400x.raww eo()ds(vcr+8,v6 i jzs .o+ sk Hz sound, the wavelength of a 200 Hz sound in airij. +. x (+cv(8 owako)dssev 6,wrzrs 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 thamutrr b-cl9l 0sj)w) 3n 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.xwoyt5kj 6h 0l,rt0 y frequency 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 waves6; ezk6slz2ma uniformly in all directions. If you move to a point twice asl ek6;za zsm26 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 proport0q66fntdyxsy2x e q up +8tl(9ional 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 sourc 192 aer/ olpgabn4h)fe is I. What is the intensity at a distance 2d from tho4fa g9rhbal1en /p2 )e 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 equally in ae-ds9i9uj m8 kbz: c9 (eslvgve+ zd*3ll directions.9ve-v 8sd*9um bz+ej( g3c :dkzei9ls 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 thatg4dp5b*4kw t5zfv y 9f-4u chha*v6bc is radiating equally in all directions. What happens to the intensity level of the s 4p-ah* hz* w kbd465fvcv4guy9t5 bfcound? 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 inoo7.bwf:3q h ll 3cw c2yaq9/pcreases 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. Whatour8*bc7 p*mj characteristic of the sound increasesjub*8om*cr7p ?

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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 mf 0 (luqaem7: 4fx,pxqa-4lseusical 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 ao.co3ee:9r;bgug*xmn d j0 juo)t.)ko) j6oo 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 fr :;zhv7bj rhvg;1lzd; om air 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 displacement waves erve6:*/xhpi 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 th87ni2mi6 ygfy)q t9:l6dz p5q 2xfhboe sound wave generated by the guitar as a result of this vibration. What do these two waves haqyi l29 :66gt)bpd ff y2onx7ih 8zq5mve 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 which9wymvhqkv g/ua1 *:m6 is 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 lengr6i mogs0qq . 9d)tdyu,he ;u:th L. What are the wavelengths of the three lowest tones produced by this ys:re0; dtigqo u)d.h 6q,mu9 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 o1dbi+4xm t8um pen pipe of length L is 200 Hz. Which one of the following f ut4mx18 bmd+irequencies 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 frequency. /oon or0rb+(f76zsg-d utns/ Which stateu7ozn/-bd/60fr snoot g s+r(ment 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 t ebb c/dv136i 3x*ii 8gfggl,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 odn k-t z*gal;m,5 q7ncf length L. What are the wavelengths of the three lowest tones produced byan;7t dnk c *-zgql5,m 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;p4gfbi mlh 3 v(a,aq/ a closed pipe of length L is 200 Hz. Which of the following frequengbi(;l, ap3m v4fqah/ cies 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 fun3d/o: ur3shb biq+;fq damental frequency. i3rudb h oq;fbq3s/+: 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 spe3(( 9pjw adg0xq ydm+oakers driven by the same source. Each speaker produces a tone with a frequency of 200 Hz on a day when the speed of sound +p w9y (mj3(g0od dxqais 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 tw2bhyi6 br zx/1o 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 is heard. 8 ni7a.9b nvs-tdj ir,What happens to the beat frequ-r,jnvdtb in.97a8s iency 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 explainsi 5hg6m;f8a wg

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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 fbyw8f7 elc)yq ll7).yrequency heard by the observer iblyy lf )e.c7) 8qy7lws

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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 frequency heard by y7-u 1uus6wzathe os-6wy 7a1uz uubserver 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, it vn(9amx m+7n. , 9ykmqylzhx1s half-angle will decrease by a factor lmh 7vm.qn9n+a yx,9z(ymx1kof:

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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 oafc:m6g*j 1gc0jy; *g )hsthhf frequency 45 kHz in air is 352 m/s. What is the air temmj;hgjs1g)h*c* h ga:ftc6y 0perature?

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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 soa;o g8 x/dsqwt8;s78ugpgjj,und 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 bat emi: 9s 8x+qg;kvi;lzelk gl12n lts a shriek whose echo reaches it 0.0250 s later. How far;vlk+ nz1 g lg9s;2llekiq:8x 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.wdb7kh+j .jm - 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 lightni7oyrm0rt8ar6su j9dj h2:a/ cng, the distance to the lightning strike is abouoaydr 6mstj/ 0a8:79rcjrh2 ut

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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 te;v-b: fdw4r zgmperature 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 splaw+w.8 d kgcfo(sh 2.5 s later. How deep is the well? (Ignore a.( ocdf wg+k8wir 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 airqjs + uicjo,6.8p a+bd of 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 atnrsn ckz,3 3i/ $23 \; ^{\circ}C$ 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 wit.f+qqijvv;d why(nk5h 9 zv:(h 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 qyj-t20j9g6.uacus (fll cs -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 of two sounds with intensity levels of 70 v 5(*eqs4zrb aqy.j;fdB and 40 dB;sz4.ayqre j*bq v(5f ?

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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 istmsxg 1 skm(qab+oa, ew10k)vxr(48y 100 dB. What is the intensity (vm xem g0w4(ra ,y8t bqssk1+1 xkoa)level generated 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 source that is radiating eq evbss*ihkv2gg)ow:n, +3 lfp 53wd;oually in all 5 f,w+ gndboiwshs lg2v3:3op)kev;*directions 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 equalzej 0u:x h-u0hly in all dir-eh:x0uuhjz 0ections 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 1ao +f.uck up*power, which is assumed to be uniformly distributed in all directions. What is the intensity level at a distance 5.00 m from the dufac1+.*opuk og?

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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 6kwn/e6zn t3/mrt ac1 +5 dB at a distance 5.00 m from a barking dog. What would be the intensity level if two identical dogs vent6/camk/3z+ r 1twnery 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 sourk 7wwxa41. oq5j:bgz fce 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 rakqz owg4x5jb :.aw17 fdiates 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 frpmqh8o- p9xs) om a point source is 95 dB. At what distance will it be 75 d)smo8hx qpp- 9B?

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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 1200gp;non8h1wy u5ysict wvs* 8* 1e+y 5pj ;8ift Hz. What is the frequency of the fourth harmoniciw c sjyp*uyiony ;5hs8wptf+1t*v e51;8 n8g?

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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 is ttro4iud,bh5 3gra 75 c.ign; lhe length i5,rntra .5i3c hg g d7lub4;oof 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 lengthpx; -j(8j dk5krohcb+74lthu L is 400 Hz. What is the frequency of the lowest tone that will(;87 lhcupj54hkx- rd+jbok t 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 length of 0.80 m. If the velocity of sounq/zuied1 2c 3ad in air is 340 m/s, what is the frequency of the second harmonicz3/ q icd2eua1?

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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 tempevr .c78r fzaz2yagee442qtj +0gt *dsrature 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 Hps e ;ww5 :vnic;+ye*sz. What is the freqp;+wew:ss;ey vi* n5 cuency 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 one end that will have fe/1 /i gk2m:r rwdx)za fundame/ /)2zgd: 1frwm kixrental 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 temper4.b 4aigebj0 yature 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 temperatuj x:2h3, j)m8siims( h1nqhbdre 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 soundfg 2s16pvj ab3 in air isp3fv gb 6a2s1j 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 xc5nlk- q, lg 70nw/rxon one end. If7 5wx-r0l ng/cn,k lxq 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 eachgwdj/o; j.tb1 emit a frequency of 800 Hz in air where the velocity of sound is 340 m/s. How much fard1wbt; jgj/o .ther 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 d)pj;g f- u( f1e6etf4ko)rqw qe h4c1f8tn s-by side and driven by the same frequency of 500 Hz. If the distance from a pkt(1;8qdj cr fenefg64tq -14)fw f-)sue pho erson 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 frequengi m7e7fy/rkjb.olq 8+d9. uecy?

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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 forkx- , (zdqsb+qf/zb+lc8qhi v+ to tune the frequency of a musical instrument. If the tuner b(-qsb+/8qxf zqhz+d+i ,v lc 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 soun s)-f-l(uh4n ybr yht,ds produced by two horns are 6 m and 7 m respectively. What beat frequency is heard when the horns are sounded on a day when the velocit ),n4 h-bsfy-r(lutyh y 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 orchestra are found t,6ghn-g+ykt4hc l0e io 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 frequennei 4 ,-t+kg60hylgchcy?

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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 sou5,vhl ) ye2hyynd source at twice the speed of sound. The observer hears a freqy,5)l2hh v eyyuency 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) f s3 oms;.hc,hs6/cf uapproaches a stationary observer at one-half the speed of sound. The observer hsmso fs6.c /h3fc,; huears 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. b94x9wf +swqm4eik e*+ qq 7sh If a listener moves with a speed of 30 m/s away from the source, what is the frequency heard by the observer? +ees7wm wq s4 kf9h*qb+q9ix 4 (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.6n9hr0nu,omtfs n a fml+x( *- It is traveling at 35 m/s on a day when the speed of sound through air is 340 m/s. The car approaches and passes rnl*,fnmxaohuf+(9t6ns m - 0 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 stati**-s2lqzop*tptz09ei r.b ne 8f o q4zonary observer when a train approaches with a speed of qeeinp.-t0qz8 sp 2tfo rz *zlo9b* 4*30 m/s. 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 km/h. The train blows its 400-Hz ti9p wm 05yj2s ju ;v3o,ylaf.whistle. Take the speed of sounjv 53;,mywoal0u y 9fjps.t2id 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 km88*jqqx dwh .bka55t h.ryr m7/h toward a stationary train. The train blows its 400-Hz whistle. Take the speed of sound to be 340 m/s. What freh5yqr dh a587r x8km*w.jqbt.quency 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 itsfk+a8)k iir 9wjqs l.7 400-Hz whistle. Take the speed of sound to be 340 m/s. What frequency do you qr+8wi kl9i f).kjs7a 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, an-g -j:n 4 jqbmygcwr.5d you heqn:5wc-ym.g -j g4rjbar a tone of 400 Hz. Take the speed 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 huji;e.wn)qv g/r8 z m6*sxpn/orn is 500 Hz. Assume the speed of sound in air is 340 m/s. What is the frequency heard bzi x un)6q*n;mprse . g/v/wj8y 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 o+eoq t 98pivl922pyf yx-; :gotad.ws,r gpf.f sound in air is 340 m/s. What is the frequency heard by an observer if the observer is approaching the train w,txppq p o:sg 9yg+8l; awrt.fie.yo- 92d2fvith 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 t1lt*: icyhzpr:n 0 u7+fzg4khhe speed of an object. A 40-kHz signal is sent out, and a 42-kHz signal is returned. Assumezr1ty4 :kn*hi7guz+chl0fp : 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 conr-qxr2rki7r9p1fj33c)a zp nical shock wave 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 speedn,t *7) kqh rzomg05tu of Mach 1.4. What is the half-angle of the conical shock w*q7t0,5) rto hzmugknave 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 the United States to Europe uw*tqztjnb j5 dl:0/3with a Mach number of 1.05 where the air temperatutn:wdtuz* lbq j j/350re is $5.0 \; ^{\circ}C$. What is the speed of the plane?

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