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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*/3 hoztzs o8rxd+,yg 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 fastejb/j q 7b:pw,xs/.cbqst 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 oq. kbd1 as:mn*7rii8 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, whatpx 6vg safv)9r y:m+r7 happens to the velocity of sound? (Assume that all other factors remain constant:+xapv r 79ysgvf) mr6.)

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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, hzaqt+3n47 ug the velocity of a 200 Hz sound through ai7guznt h3a+4qr 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 of a 200 Hz sou0 o6v1m.cirzej.0) g 1otd(t1tg qfdznd i. 0)crm1 dzqf( 0jt o ez61t1otg.gvdin air 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 calnnj 2n1r/h 2n*-wcbq rled

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8#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Sound vibrations with freque8q4,whqt j3lh ncy 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 dir+or5uu;5q vatkpz:f3 ections. If you move to a point twice as far away from the source, theau;53f p+:tokur vz 5q 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, intensyt:ml j0;.+kxb3 m4f fhst 4irity 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 I. /5tq ts(oh3nsec/4f 1kkx v c( What is the in(hk1c kt3/sec4 of/q nx5(ts vtensity 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 g y:xh):fua:vf3fg 4 yyew/ p)is radiating equally in all directions. What happensy)eah3p /:yf)g xfgy v4fw u:: 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 .+ws, b3z ofc, aq-vhrradiating equally in all directions. What happenzvf,.abs-ho+ qc3,r ws 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 souu bm,op6 9;r)xqhrwy q4gxp,- nd 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. wyl+zy 6l:0 zdWhat characteristic of the sound +6yl0 :ywdlzzincreases?

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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 munug(v+m9+w5o idoc/ nsical 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 mm)etwcn ( u+n-usical 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 frot;-t 7wh:9rs i7rz3yyeexc u; m 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 ar 7dzza1vsec-o5f(avxi ./3g0d 2 jfad e

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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 generat*e7tn u2minr2 fq0h1ned by the guitar as a resulti* tq2u7 rnf0 2e1nnmh 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 k. k5 y/zjwk8cends, 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 wavelengths of the three3-hln* yvtqv 7ntg-o0 lowest ton0o3vynht* -ltv -7q nges 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 pi nzv .3vm;3k fm9h5izduq+p b2pe of length L is 200 Hz. Which one of the followd 3h;v5b+i3.v mnzf9u q 2mkzping frequencies 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 resonati,s1jtj 2cjs ;bng at its fundamental frequency. Which statemes1,j;j2 csb jtnt 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 wr:y* 5gp d gc l+gp5cwhvx+p8*pi+g.ohich 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 4b1oq *q56fn n,*xwe s.e ;.hjis izeqlength L. What are the wavelengths of the three lowest tones produced by esjn,wq iobxe.nq*z6 54i;1 hq e*.s fthis 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 azt, zsrultanyhr/*4 38)7ymn closed pipe of length L is 200 Hz. Which of the following frequencies will not resonate in that pirh8 4yn)r*/ zzutns ,at 37lmype?

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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 fun6,d+l qpg7khkdamental frequency. Which statement is correct kpqgd67l,h+k?

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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. v /+o6,k gs02lftpddpEach speaker produces a tone with a+ lpv0pdk6og,tfs/d2 frequency of 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 bea.bx:r -iwmf *pts, the 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 so 0x8hv0gjyn ,xunded together and a particular beat frequency is heard. What happens to the be0 hxn0 xjy8v,gat 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 explains+vu:c-gvw8 ctkmc((t

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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 thr(fkzqrrwt *5s/7a1 le observ(k1rzftr /7w lqra5s*er 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 observer. The frequeoa*gzxqpf.7 yjds j4d30)l4 ency heard by the observera. g4 ey0)jdxfpjz dl3 4*sqo7 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 decrease6 k,3yujb o. xd:x6oeq by a fay:b u.eo,qdok 3x6j6 xctor 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 sound of frequency 45 kHz in air is 352 m/s. 01exg- zwey1,zsb 6 m sy4wv:a What is the e0 s1az4x 1,: smywvbw z6-gyeair temperature?

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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/b(g2vx +l)a m5wmdl 9oo;pf g speed 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 air28khor3 : ,o j5x6fdf: ldlnrwq 3qgd/ is 340 m/s, a bat emits a shriek whose echo reaches it 0.0250 s latwnlq8 d,/3dr :gr5fhdoqx j:lkf 62 3oer. 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,)22qr7tvs1q jlwuqgp qc,w (0 and hear the echo in 4.00 s. 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 sneq *xj )wo/6v after seeing a flash of lightning, the distance to the lighqxjve6 w/*)n otning 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 d7 yv7zn(kpm.oab)u 8 z:wo:afrom 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 is m6j x3:f0c4eom* n*mz)tfcqa the well? (Ignore air *mtezn3*f cq4 mm)j6 0cxa:foresistance, 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 frmg 3 * bniuyd lh+x +u;q*wvy(-28iyzsequency 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 ohzmni 6-l,3y .a.bai $23 \; ^{\circ}C$ 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 x2ez 9hxmk)dcf) qa wu.g0a 6*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:)y,t lfdiv0 p ozf),e 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 lev*+gdiqnnb9 dt( qy4;j els of 70 dB and 40 ;*n j(dnb+ q4gyiq9dtdB?

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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 intir o7p)x8-njm8 nuof-ensity level gene-oox7u8 j8prnn m-)i frated 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 swtm l2w 1bn8o2ource that is radiating equally in abww1 o8tn22m lll 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 sourlabnp51o qv 6id*d a4vf.t-8(f qcr(sce that is radiating equally in alld o5v4 fa(st (c*6qpqi8nb.ad1vf r-l directions 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 power, which is assumed to bell ffqx, npi01fi,6* k uniformly distributed in all directions. What is the intensity level at a distance 5.00fx*16kli, fq ,0i fpnl 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. What wo m7 k0c2tlbef0uld be the intensity level if two identicalbm0 0lkt 7ecf2 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 source the intensity level is 60 dB. Whao t;)l hqyo:d1t is the intensity level (in dB) at a poiqy:o)d ;h to1lnt 2.0 m from 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 dB. At what wbonw7; .byv t4ci.da p 0g)n5distance will it be 75 dB? pvntd.75;b40in) gy ob.wacw

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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 fx b:fjs ;g-uby6k3u3s requency of the fourth harmj 3kuug f3xy;:-sbs6bonic?

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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 hadg9*-+t zua ujrmonic of an open pipe is 900 Hz. What is the length of the pipe?d*tu+uja g9z -

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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 Hzd+bi r(he,f f/gt -tg). What is the frequency oh(fb ti ,trdg)+efg-/f the lowest 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 length of 0.80 m. 6m+ -*nqdya b;mvxs l7If the velocity of sound in air is 340 m/s, what is the freqn+x q 7bm6m-l*;v dysauency 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 7y h/pv* (wcjmroom 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 e,a)*sbu f (qeund is 330 Hz. What is the frequency of the)uq( , sufe*ab 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 closil,(yp3km smlu l8j idhn5 +q)k;n-u/ ed on one end that will have a fundamental frequenc, ;3 mi/- +psyj(8hin)5 dqluknlm lkuy 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 azqpjr/n,n) 5 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 temperature ilz ls9(19vmr n01cnbp s $20 \; ^{\circ}C$. 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 0h-:y pcolij /+h 3gz,h.75 m is played when the speed of sound in air is 340 m/s. What is the f3hlyjczh,-po/h: i +gundamental 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: o m 5-y(v 0qlqehyu:h:de b47hane is open and the other is closed on one end. If the fundamental frequency oe 7 h-5q0auv:h:qdlbym eh4 (yf 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 cdz )c9es,u6zp/i5fh vu ;o:t)p9bce emit a frequency 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 sosdzhv oec ;czp)c9/u5f epb9 6:,uit) 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 by side and driven by the zx,gg /p4jsf7same 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 possible the distance from the x gp/s ,gzf47jperson 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 frequency?xmvzgf8ig1 ;n3)or;pkw /t t6

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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 tu1);:kpp8xvrocpe 2 bjne the frequency of a musical instrument. If the tuner hears a beat frequency of 2 Hz, what is the frequency of thrp; p :)k1evpjc2x8b oe 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 and 7 m respectivelas jsc5-v( byh- 06tyuy. What beat frequenc-c-0js6yutavbh 5 ys( y 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 two*4m9xozmrl oe 6kfk6ya8 ,,je 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 4kl f e*raok,6,9 xm8j6z yoemin 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 station7 up(8mntt 18jgwc,m4w1w s nuary 1000-Hz sound source at twice the speed of s guwpunw8m4 1,m ct8 swnt71j(ound. 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) 6uk dxw b355yvapproaches a stationary observer at one-half the speed of5dw65u3xv ybk sound. 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. If a listener moves with a s 4x+igsx2.s zcpeed of 30 m/s away from the sour. 4z+i2 csxgxsce, 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 trapqz2 zli.dtz(*t2)ztveling at 35 m/s on a day when the speed of sound through air is 340 m/s. The car az2qt)* zd2itzpl( z t.pproaches 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 by.bzt/y7 d q;oi lv,.gy a stationary observer when a train approaches with a speed of 30 m/s. The frequency of the train horn is d.yoz l7v;,y/itqbg. 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 tz j5 -fo7r+;kb1 :zzovaeqdbk-ato rt 7k1+s8rain blows its 400-Hz whistle. Take the speed of sound to be 340 m/s. What freq7 kz ;a o-5:71qk-brae+8vtdk1zbs ojz trfo+uency 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 train. The tndf2p h:xi0w+l:-wf drain blows its 400-Hz whistle. Take the speed of sound to be 340 m/s. What frequency do you he-xp+:fwd 2 fdn 0:ilwhar?

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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 9ekot 3hbr +tv-d*1 ta0nbm+a from you at 120 km/h. The train blows its 400-Hz whistle. Take the speed of sound to be 340 m/s. What frequency dob vdbk m+9trn1aot+a*t 3-h0e 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 yowwg00h 7h uo.xu at 120 km/h. It blows its whistle, and you hear a tone of 400 Hz. Take the speed of sound to be 340 m/s. What is t wg7 uox0h0.hwhe 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 speed of so9pq4 9c ehoiy0 pnmi.19wfav *und in air is 340 m/s. What is the frequency heard by an obse9pevi 9w ha09 cqmy4*po.n1fi rver 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. Assuk;da) zo+4 tudgc0 a1kme the speed of sound in air is 340 m/s. What is the frequency heard by an observer if the observer is approaching the train with a speed of 30.0 ;taacd+)z 4k duk1og0 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 objeem,57bbpu+u l 1bo( cjct. A 40-kHz signal is sent out, and a 42-kHz signal is returned. Assume the sbl+j ce7m (ou1bpb,u5peed 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 supei5 dlabni0 )z)rsonic 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 tsu elr 7/dt+ ,wp/n-mlhe half-angle of the conical shock wave ford,+twu7-mlln/ e srp/ med?

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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 with a Mach numbgz1:cm.1,ts*kp d wxy er of , :txcdsp11gwy *kz.m1.05 where the air temperature is $5.0 \; ^{\circ}C$. What is the speed of the plane?

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