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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 following03a,o-cbmot: e.hh we8 eo rf. is 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 1 kbfky9nclmb rb*sbev8(55,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 a steel 0klc ndwi3 5(rikxjwwz7,e/g tiq8/ , 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 increas v)ou:nocz8. 9j0krbhes, what happens to the velocity of sound? (Assume that h uo:.jcvk)n9r 0bz8 oall 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 velocityy34 -y n*t+vvupighw/ of a 400 Hz sound, the velocity of a 200 Hz sound through air gw*h-nytui y/v3p v4+ 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 waveleng88hb8dhghtf z 2b6 7ibth of a 200 Hz sound in 2b7h tgd8i8 b8z6bh hfair 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 2y )r6 2uqf,raz0,000 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 frequency less than 20 Hz are ca1din*tw- r:w/imm b; jlled

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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 directions. h3pl a)na/6ea3pucw) If you move to a point twice n3c3waup)pea6h) al / 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 waves, intensity is pro0c men/wpy6b8 g hh00lportional 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 on5 on/c+:xj)zd l 6lhdistance d from the source is I. What is th)ocd/6nxz+l 5 noj:lhe 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 is radia62 jz ,byj7:mgnyb.n bting equally in all directions. What happens to the intensity znbbygj mby6j2.:7 n,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 qhdh6q9qb+2hw p 9-wea sound source that is radiating equally in all directions. What haed9h h-29bw 6wq+qhqpppens 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 ny6 tk.excu29 increases 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 towardk-by 8y.e eo5,sciiw * a speaker emitting a pure tone. What characteristic of the eosce.8yi, 5k iwy-b*sound 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 musicals kop0u*jl4( a 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" or: (d epc -( zp3xd);ry9uorinf a 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 from ai/ unhsg38djz z6r 8p9gr 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 displacvdpxyn)o9k sa;oxu:s.pk+2 k 5*ir)fement 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 sound wave gen-y oougp2s2 3 :xn4reterated by the guitar as a resul :yoexs4pr2u2gt-no3 t 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 d;k 1(qk p;kfz w/rhs7at 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 wavelengths of then a6 ksg)v s5:6m)okms/ooa-r three lowest tones produced bykrmv6o: )os/6)ma-a gskn5o s 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 repyx;ko g8anyghgo/1.*ooh;( sonate in an open pipe of length L is 200 Hz. Which one of the following frequencies will not resonate in the same piyk/g *x( yaogpg;oo .1hn8;hope?

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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 :k0jjvx- codw92pc(v fundamental frequency. Which statement is cojwpc0j2vxok c 9(:- vdrrect?

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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 e6 (c:itc2dnjurw5-u;e/ayi qnd 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 rrox7r;ef n*kjn*9+vwavelengths of the three lowest tones produce*9;rjfo7v +kxe nn*rr d 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 r 2 brz/vy3;y sn5n9fcqesonate in a closed pipe of length L is 200 Hz. Which of the following frequencies will not resonaq;c23 yrf9bvynns/5z te 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 fundament .em* jfw gc,0tho-:weal frequency. Which statement is correct :-weho.e m0*wfc,jtg?

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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 theln rtu(pa0 k/: same source. Each speaker produces a tone with a frequency o(l:ka u/ ntp0rf 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 twoprvyutu:k7x x k4z,8 j bv8-v1 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 soucer;dlj-jm ;+ nded together and a particular beat frequency is heard. What happens to the beat frequency if the frequency of one ofd; je+;rcj ml- 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 exrnc0t8 j +q-veplains

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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 stationarzt5 gw0t p pca+4)o* ong. s1z.kiii0dy observer. The frequency heard by the obser5ii.o0+0ggp zptnc )z* it4w.1so a kdver 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 obsel0+mui1+xu ly:fwp psie2 2-drver. The frequency heard by the obu eswy uil02-21f+ plpd:m xi+server 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-srg 4wv5ry u vdi*)v5recg27w9peed, its half-angle will decrease by a factor of452urvrwdc7 yv vr)59*wgeig :

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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. Wi umjn: s*fb6nl+ u-4y9vms, ohat is the yul njfs ,:im 94sm-*6uv+obnair 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(1 j c camkc(51y 2rgfm/qzxv: the 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 air is 340 m/s, a bat l881, qprgqo jd:a1f4krahse gu- yb) 3,yai3emits a shriek whose echo reaches it 0.0250 s later. How far away was the object that reflected backau8:i g yr8 1 aqje4 ys1qhgdrbl,fk,ao)p3-3 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 thwev3q: w pzt.6e 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 seeing a flash of c;dvuv ;9s+ yf uzefdl5)m98 13ezjxalightning, the distance to the liya5uj; szv 9+)vd;femlc38eud 9f zx1 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 on a day the temperature iq;ocud;lu+o- 9rff ,- z*gdbd s $15 \; ^{\circ}C$. 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 de sqq ) :pij(u.yca:uh8ep is the wy:ihj.ua s:q8uc )p (qell? (Ignore air 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 air of a sound wave of freq7i3d7yhrw:hx7 t kr*: dvm+ijuency 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 airni k7dryxctx, ;; l3t; 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 lug ;*ya 3(ufhof 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 ofhmk8 m.(v 9brh 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 ss-cxc q7si1 epc/9y4 :wivt+ n ;skqh,ounds with intensity levels of 70 dB an/s1qw 94itik,-c;+x cq7ycsp e:h nvsd 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 intenscv(fzy4jsqf( cn (72aity c 7 cnfq(a(fj4(yzv 2slevel 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 isols 97w.w; cmgfq v:h/ radiating equally in all directions is;7.w s9lq:cfm /vgw ho
$6.0 \times 10^{-10} \; W/m^{2}$. 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 a1aja.fl+ i9 hx source that is radiating equally in all direct.a +1xl9jhf iaions 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 ablsz -cngaio;9 (d 5-blout 1 mW of power, which is assumed to be uniformly distributed in all directions. What is the in-n l-c9l;g z s5ab(iodtensity 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. What 2dadr /4ii:ywwould be the intensity level iw/ 2ard4i:id yf 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 source the intensity level is 60 dB. What c;6v*l.dq bsqp9 l*cud -g)uzis the intensity level (iulcpds);.zdb-* vg uc qq*9l6 n dB) at a point 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 rw :hf n1fzko3mx-a /-95 dB. At what distance wr:3-/fazow-f 1 kmxnh ill 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 frequency of 1200 Hz. What is thjbqe v4+y1tc f(+)kpvj y9, *r coxm0be frequency of the fourt qc pojc+*f+ yj 9 )vy(vmxrb0k4b1te,h 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 tht(dva6ahj 3i+ t1t+qze length of the pipe?d+z1ja36vq+ t (ta hti

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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 lengtvd./rzwu7 t 47nqr d+, 3yzkvuh L is 400 Hz. What is the frequency of the lowest tone that will resonate ink /.wund,dzqv3rrv 7u+4y7 z t 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)o0q j9d ,ajbl gr)ra( has a length of 0.80 m. If the velocity of sound in air is 340 m/s, what is the frequency of the second ha(j),gj0r brla dqa9)o rmonic?

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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 whe)t+pgb3 5 umh.8uuru -on+zvere 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 frequ ij t,(w97,dlyea6faj0ryv/lie za;1ency in a pipe closed at one end is 330 Hz. What is the frequenlt,v;,(/z1e7jlr ayj0aa f 9ewyd6 ii cy 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/n0yg e:xjdiv4t4m : v the shortest pipe closed on one end that will have a fundamental frequency of 60 Hz on a day when the velocity of souenvmx :g/yi4jdtv :04nd 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 d/puwyn wzva)( 3m0+ga 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 in a room where the tempe608cqd dln ti z42e+wz1ruu6erature 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 whec -rej 8 ds0 w:sf7whx 25x.onam2sxw9n the speed of sound in air is 340 nexm ax r xwwo w8s0 795.hj-s:dfc2s2m/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 oti +r-rz* ihd (oyrzlg5u58jw9 her is closed on one end. If the fundamental frequency of the open pipe is i z*-lrr d5 hjowiz yr(95g+u8300 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 fgnykj 22aiz6oe3s w( 2requency of 800 Hz in air where the velocity of sound is 340 m/s. How much farther back would source 1 wi kn 3ys(zae22g6jo2have 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 side and driven by the same frequency of 500+m 2ses o9y6ikx0 ivw+ Hz. If the distance from a pes+o0y ei6sxm+9iwkv2 rson 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 Hd, us wj0*)gy*6 ktmu khs7)elz. 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-H o7vapiltmif m1:h4vn). x1o/z tuning fork to tune the frequency of a musical instrument. If the tuner hears a beat frequency of 2 Hz, what:ni1mixf1)pv a om4.o/v 7hl t 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 s8 o,75qptochxounds 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 velocity of sound is 340 m/s? ,ohqotcpx57 8

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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 violinsg6g-vziu +p;cd)pn p- in an orchestra are found to produce a g);upnpd p -zv+-ig c6beat 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 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 1000ae/n8;+y0zc1 ddfp r tjedv ,/-Hz sound source at twice the speed of sound. The obsd8 n0+jzap, /y;te dr/ 1edfcverver 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 stationary obsereg -4 occuvqa,u /9dd5gy:t g( gsj2v4ver at one-half the speed of soundgey,(dv/uvg 9jt sc 4a4dc2ou :q-g5 g. 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 c)vxu1qy4qj8umqb 9 2zle5 0 rspeed of 30 m/s away from the source, wcb v8) quy0e1zqjm492xlr qu5hat 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. sq2h lp1vp8 q+ 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 an observer who is standing along the roadsivh+pqp1l 2sq8de. 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 observecfi i1o4x:aq( i*-hrxr when a train approaches with a speed of 30 m/s. The frequency of the train horn is 600 Hz and the speed of sound is 31iq4 hic-of(* rxxia :40 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 blhd imh3 +c*d9uhr/ o3qows its 400-Hz whistle. Take the speed of sound to be 3ci *o r93/d+h dmhhq3u40 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. *s2ev /lar)ht bj4 .cvThe train blows its 400-Hz whistle. Take the speed of sound to be 340 m/s. What frequency do you hearh2b4sv.ca j/*le)vtr ?

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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 120k7c av/ngl0 b. km/h. The train blows its 400-Hz whistl l. /vagb7cnk0e. Take the speed 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 a0/bf*t5oal 4*h qp xb mgh9b0bway from you at 120 km/h. It blows its whistle, and you hear a tone of 400 Hz. Take the speed of sound t 9x bo/0 *abfl h0qtg*bmp54hbo 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 horn is 500 Hz. Assume the speed of sound in air is 340 ynj; n5 q0ulfr*xgowo,4xm04 m/s. What is the frequency hea 5n0oo n*f;q,l0x mux4yj 4rwgrd 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 is 500 Hz. Av: 4uecqsxlv.kxi95 7q 0 a4sissume the speed of sound in air is 340 m/s. What is the frequency heard by an observer if the observer is approaching the trai vq5usikca40x liq47e9svx:.n 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 an gpgg 1--uo; dw:zbep.object. A 40-kHz signal is sent out, and a 42-kHz signal is returned. Assume the speed of sound is 345 m/s. How fast isgw;e-zpgodupg :1 b. - 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 supe0+ h)y)d yl *1efwdkr-cn hc9:5voh rursonic 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 9hjb kf9per85 half-angle of the conical shock wave formed b ek9pjfr89h5?

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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/i u:0 2z1a(f 7o*ytj pgzijrw number of 1.05 where the air w*:1zp iuoagy jt/0zri f7(j2temperature is $5.0 \; ^{\circ}C$. What is the speed of the plane?

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