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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 (:u:c 2w hsq68kgjihlstatement?

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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 con-zps 5d smb(l;dwbj+( 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 r20aufk2k -tblr60 ts 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 happel7oy9xknfl24b) g* iw:)u c(abjb( mons to the velocity of sound? (Assume that all other factors remain constalk2ugbf7) ocj 4o9 bb ln(i*wm axy)(:nt.)

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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 o -iy2l b3fnq 5+9iakgef a 400 Hz sound, the velocity of a 200 Hz sound through a fnigby2q-+l5a e39 ikir 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 20ctic;gow+rc :d w wi /kd dsl)/;(qj350 Hz sound in airc dd(/o3;cwii qwk5gjtldr/;s wc:) + 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 fhguum k9i/z g/;kk87kte(r2called

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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 than 20 Hz a m uxzy..3p,stre 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 uniforppr0n 5+f t 5w6tmc0efmly in all directions. If you move to a point twice as far 0ptfr0+6 mf wt5c5np eaway 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, intenshvbr-z-//9w ( d ik0ca kx9fwmity 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 sourty /hcggvv )9/ce at a distance d from the source is I. What is the intensi) 9v/g tchyvg/ty 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 is radic,.l p ivb-rr6ating equally in all directions. What hal ,- rcv6rbi.pppens 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 that6k877huaaq4 npl i:fg is radiating equally in all directions. What happens to the intensity level of the sound? It drops b g a6f7q8 nlhki:a4p7uy

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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 i(nutbyej; 3 9pncreases 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. Wha .ptds96twkt:1*v (an;zm ru rt characteristic of the soundrpm1; kz*.v6atu(d:rws9 ntt 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 nok5obxa/+ zdtmywyvbx/ )e- .;uf6,d cte?

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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 noteyw0ym r3m0yy,bxss5q fk5s jt3n 81 a5?

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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(qw3/ cjtepj(qv.i; p26aksm 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 displacemedq41-4ttdn cn nt 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 anda +j gcvx8/+;n8rqp m5e vcgp, the sound wave generated by the guitar as a result of this vibration. Whj88pme++ gav5;vn ,/g pxc cqrat 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 atn4syenw8 bcz qb p* 80sldr f8yr 5xo/:4x6y:m 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 waveleng(o.qq 6fllgoi- y 3mory6z w;1ths of the three lowest tones produced by thirq; o3lm6wzfgy( 6-yqi .1ool s 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 reso + ujh)jax)5vznate in an open pipe of length L is 200 Hz. Which one of t+) z uh5)jjavxhe following 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 resonating at its fundamental fre)a1t x62loguriw+. a 7+cfld 1*oxuttquency. Which statement is correct 76tc1ax )txdulitoa* 21rlfw.+uo+g ?

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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 cljrlapvs0ou,9f+*hj,n17* b jz8z kn losed 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 oaqy4p(+ xssu (f the three lowest to (u( a4pxsyqs+nes 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 H9e c .gnbvq)gl.b 0 ;7npkg gyiz+9cy0z. Which of the following frequencies will not resonate iebynlc.)g .g0b0+kq;iy7vgcngz9p 9n 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 onf ymd89hdg6q51 vn3k ve end is resonating at its fundamental frequency. 5 ndy98 fqd 3h6vgvmk1 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 speakers driven u g*7z 6qmz2bc)simi.);bny f by the same source. Each speaker produces a tone with a frc mif)i n y7zsbg;2z)b*mq.6uequency 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 beats, the two sound waves/lzaa*i3mh8j2e4 o mlc3 /lnh 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 heardgeq3-pz 797f7u2n ,h watgjjw. What happens to the be39whqjt e-fu gzaw72,g np j77at 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 exp b0q)i/:;cb8a8h i l vemevc(vlains

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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 c be/ p,ga57-kzjeff2v6a b-p observer. The frequency heard by the observefa5p z6g bpfkevj-,/- 72cb aer 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 9x oes8wz6gx r55t og;from a stationary observer. The frequency heard by the ob9 oox 5 zg8xr6;w5gsteserver 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-a.x-kfb3k c ;eungle will decrease by a factof c;.kkx3ub- er 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. Whaa uiiz 7zed yrztlf)la46;: 68t is theu td za;z7)year6 l8:4l6zii f air 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 speed of +9-qlrw-vso isound 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 emits a shriek whose e/rv m5vyb .8hwldan 53cho reacb5vnyr/wmlv53h .8 adhes 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 thm7fpu9( 8sds3y k4 clue 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 s after x5qkb)) (we7r u hh0tuigz;hm0-gdx; seeing a flash of lightning, the distance to the lightigkdu) r xh5w (;-t00hz7bx;qhme)gu ning 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 on a day the temptji ozz +eli k8vp3p,u-:q0x*erature 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( ogi.2el p;t;gb yb*r and hear the splash 2.5 s later. How deep is the well? (Ignore air resistance, and assume the velocity of soundg y ;;epo2b(t bgl*.ri 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 wae11 k;k5/prbfigm8 de ve 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 wx,v;udjlq:+ zlqng:w 3x8t7q5.aug$23 \; ^{\circ}C$ 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 intmy-15hj7gu k pensity $10^{-3} \; W/m^{2}$?

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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 sound?1 1atq3s 4zxgs

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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 in.m7nzma/n ke1ir lnz 2d04an 4tensities of two sounds with intensity levels of 70 dB 24iz7kzr nnmma.d4/0ln1ena 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 enginef* d(b5o;00 gkqdq7j6a 7z,ofvb gt lws in a garage is 100 dB. What is the intensity lea*b odlvgf t;k7o0 qd7qf06b gz,(5j wvel 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 ofnh8 t x0xs5m7h 6.0 m from a source that is radiating equally in all directm7 sxhx 58thn0ions 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 i8z/ve0bnb 9 itl0a awl.ky(v xvn:c2 7tw,/b dn all directionsl2e9:(ik/ a7at lw.b ytnvxcv0zbb0nw/, vd8 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 pyblo g nb8fe c28y;2)1 mW of power, which is assumed to be uniformly distributed in all directions. What is the intensity level at a distance 5.00 my n82ocb fge bp;ly2)8 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 wkhbw/+* qp(f2. pao 8 8ytlmsaould be the intensity level if two idam(s8p* +pyaw2olb tkqf.8 h/entical 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 0taq3t *wp enzz/)6i35ypv f a9 2syjjsound source the intensity level is 60 dB. What is the intensity level (in dB) at a point 2.0 m fron aaip)ztpyz3j0ef326v w*t5 s9qy/jm 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 poubz h(we*7 s2vint source is 95 dB. At what distance z *2svhe(u 7wbwill 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 complex tone has a freqwbi0bpa4s:j5cdy 4 8zuency of 1200 Hz. What is the frequency of the fob:sij4pdwc b 48 z5y0aurth 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 of an open pipe is 900 Hz. What is the len1z7 mfc6hr3 :iegx *xxgth of7 3chi6m1ze xx:g*xrf 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 -bcmqx,kd /s vh,gg9 ggyg.v0g w+(-b of length L is 400 Hz. What is the freque+w9gc(-dm x -g,bg,.g0gs q yv/ kvbghncy of 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 lenvj ;hn9u 4 xlsc3x/mu4y4ab +ogth of 0.80 m. If the velocity of sound in air is 340 m/s, what is the frequency of the second h94yj43bmcuxlx su a4/ vhno;+armonic?

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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 thc8 ap 8mqo:*88skivow e 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 aumr q, h7q6q(gt one end is 330 Hz. What is the frequency of th (g7q,6qr mhque 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 pipdqihkitg (p +8v l2n*c jy3w61e closed on one end that will have a fundamental frequency of 60 Hz on a day when the velocity vl k8j(iid3nhc6+ *p2tqgwy1 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 wi,l* fyoh.*qpuy* 9iu-cg o i/here 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 wzw f 6w0g(*zzy-i8sgb *p r8mthere 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 played when the speed of sound v :sex5c; qqftws7s-/in air is 340 m/s. What s q-vsw xst/:7 ce5;qfis 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 clonuymw/i7(5x2hj7k 8kfi f c 98z:j7q frx6oposed on one end. If the fundamental frequency of the open pipe is 300 Hz, why7xj7f p8i:cf qn679x52m /zk juhf(oo wkri8at 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 veloc m3fh9 ktolz(+ity of sokm t(z3+hfl9 ound is 340 m/s. 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 by 7w0azva3**h rzuk ;-rqe ixo) 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 possible the distance fro-kvh*zoa)* r7 e x0q3ai ;zurwm 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 o3afy2d n*,ctfhugo(7va u3i*ui v m ;6f 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 t6tlj 3lj)ihxca(: mw 1;17g(fjf zfgwo tune the frequency of a musical instrument. If the tuner hears a beaa:ll 6f gzmh) 7gf(j;1wf(w ij1tcj x3t 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 sounds produced by two horns bq0wj,3/nkwl are 6 m and 7 m respectively. What beat frequency is heard when the horns are sounded on a day when the velocity of sound is 340 m/ kbqnw/lw0,3 js?

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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 violin 0-jcu;va yucy-)z( ons in an orchestra are found to produce a beat frequency of 2 Hz when a frequency of 660z0;n voa(ccu )yyju -- Hz 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 10z8ufv(uka .g3 00-Hz sound source at twice the speed of sound. fgkv( 8u a.z3uThe 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 fr hfw4 /ii0-wmrequency of 1000 Hz) approaches a stationary observer at one-half themfw i0 rhw4-/i speed of 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 listenerbmpbd; 6mag56 moves with a speed of 30 m/s away from the source, what is the frequency heard 6 5m6 md;bgpbaby 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 e a9r 7k0p:vjik:z /uta day when the speed of sound through air is 340 m/s. The car approaches a9ju/ip0 a k:z r7et:vknd 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 a stationary observer whe ts -5imz2h4p ijh. lc89iko0nn a train approaches with a speed of 30 m/s. The frequency of the train horn is 600 Hz and the speh. 08mlipc25t z9 4k isjho-nied 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-H;x p-5pcfx(huz whistle. Tpx5; h- ucp(xfake the speed of sound 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 km/h toward a stationary train. The train blows its 400-H (+fdxi d(bd-hz whist-hdfd(+ i(xb dle. 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:pl dskx* g+4g qv-v-6cshu+z/h. The train blows its 400-Hz whistle. Take the speed x*hpvd-qk+ sszg- +vc4u6 gl:of 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 120yvh1qx+o nt97du/ f5z 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 the actual fre t1fvhnozd+yxq5/7u 9quency 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 thdq :g4e +3vabhzqs 2b1e speed of sound in air is 340s vqb3:+zhb2q dg41 ae m/s. What is the frequency heard by 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 isho pvtg31 b:l:8 3/inwovd7vn 500 Hz. Assume the speed of sound in air is 340 m/s. What is the frequency heard by an observer if the observnv il7v/pothwo83::1vbd3 nger 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 obs.vhvd9v1- /: gazo bf an object. A 40-kHz signal is sent out, and a 42-kHz signal is returned. Assume oz-v/: 19vv .sbdghabthe 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 shxf8rv /:1sqieock 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 speed of Mach 1.4. What is the half-angle of the conicv3k4f;yvp6 h9k, * + vyojmit)w6mg amal shock wave formedfy3mgp+ 6 a4v ,ti;wh) 9kyk o6vvjmm*?

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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 npq6v5ktd3x y 6)6fqepumber of 1.05 where the air temperature is f65yd t 3q6 pepqx6kv)$5.0 \; ^{\circ}C$. What is the speed of the plane?

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