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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 ,s jo9t,z0ntyox1h r , .y h-jg;t0fvspskc79statement?

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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 fp(7 cggz 2cat;astest 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 ss** v jjd/-ve1omj8qh fbxi4(teel 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 r7ewf1x7lo dqorv 6t7+twv32 c-yz 8 whappens to the velocity of sound? (Assume that all other factors remaq 12trvr +wlxvy77t fw6dw-z3oc7eo 8in 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 velocit.cvl ois0;bjz / sy:k0y of a 400 Hz sound, the velocity of a 200 Hz sound through als /jy ic;oz0b:svk.0ir 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,w, hqnsv+x-7xd wy m2, the wavelength of a 200 Hz sound in +n7vs mq xw, dh-x,2ywair 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 1k em(8zn8clegreater than 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 frequency less t;+qq6im ia97d vw tow,han 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 suq7 z0:u9abrh g*q7itource is emitting waves uniformly in all directions. If you move to a point twice as far away from the source, theqhrqa7 gtzu *:b097iu 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 i-ybgxk 9qh;mqk,z1; i s 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 soup d bq;f -,oggfh:8r+grce at a distance d from the source is I. What is the intensity at a distance 2d from the sourc rgb,8d; oh-g+ :ffgqpe?

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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 all1euhp7 kt7fvb9. j d8q directions. What happens to th17uf9b 78hdt.v kqpej e 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 dist)j(ip3trinch 69 x qe7ance from a sound source that is radiating equally in all directions. What happens to the intensity level of the sound? It dinc hqi67x9t)(3pr ejrops 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 mjabu*hi z g3w0 z3sh)z37zls,noy1mv+v2p 8 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 toward a speaker emiw);pfmanh refrp tvi 01,2y. 5-y p)wutting a pure tone. What characteristic of the so). )1yr n,riuat;fp5ep wwp 0fv2-hymund 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 mus()p)z8ugi o46xhgeua ical 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" ouxi a,rwxr3-ta5id 56f 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 air i0oc+h h0qah 4ktwxjq 2o.54 yby j3l6wnto 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 areo /jcl-earjbde5e as 25b 0;w-

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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;wrc b6b cx/i0 string and the sound wave generated by the guitar as a result of this vibratiowbxi/ b6c0r c;n. 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 lpy/s3 m,mm*z 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 the t4+o 5x8 8 kp+ pptr0fcxpty jz)js5gfl7m:s b,hree lowest tones produced by thisjxfpztpm :+57obrpl s,8c k fp0 s5x)g t48j+y 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 *vtl 54gltjw)fn 3 f )-b b/:gznsech1pipe of length L is 200 Hz. Which one of the fo-l gt*n3j :n 54l1 tg/v))fhfzbecsbwllowing 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 frequency. Which//y- bfb kbbx: statement is correct:fkb ybbb -/x/?

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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 cqj 0 :17sioipulosed 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 waveleb-0bydh3mf1b nit: 3e g6cpu) ngths of the three lowest tones produt edbhy3 p cgn03b i-:m6fb)1uced 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;hvz:se- : zn:j-raak 200 Hz. Which of the following frequencies will not r:ksj;-r :zeh:av- a nzesonate 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 o;b9s vhwhx+xgy/,u 4yne end is resonating at its fundamental frequency. 4gu xh;h,/vy+bx9 wsy 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 by the same sourcva xhdo:dhw1z z5ou; 8+2od rvvzr8y (c9x6r6e. Each speaker produces a tone with a frequency of 200 Hdcrd wz;8uv(o86o h xv65oxv +1 2rar:9zzdyhz 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 wap,*swm+uhj. zves 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 frequ48 b +t5fyptlfency is heard. What happens tob5tlff+ 8 ty4p the beat 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 expla /x -13t gpn p5sxsg3qoul;jvj/1xs/ uins

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33#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A sound source approt2 sbh; .-+l8oikvmgbaches a stationary observer. The frequency heard by the observer i;b -so mt+v2lhib.gk 8s

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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. ioso- r.j .m9q The frequency heard by the obses.o o-i9rq.jmrver 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 d pn36 gid0 yee,fsjd*(l/2lho mzj)4qouble its MACH-speed, its half-angle will decrease by a factmhj2gelzj/ ddf( lp63i*) eoq4nys,0or 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. awv/,vde dhqs0uz l4462s t(,:rdpjy What is the qsrd2l:d6y,p v4,4 suaz0hvte d(/w jair 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 s4z/b b7gph hmm,.u8 mlpeed 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 ba 98ih*9k1m uavfecos: t emits a shriek whose echo reaches it 0.0250 s later. How far away was the object that reflectevm c8:u9s e9kaih*of1 d 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 hcr1 zq (xfynr vrmrzz1p ;9-/6ear 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 s aftogeqbg5go7- r4m qs 2*er seeing a flash of lightning, the distance to the liqber5g7go2 *m4 g -qsoghtning 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 ax q-8lj;m q,ofeq+d/ n 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 fd8b cxg9,w5nv/y q z+deep is the well? (Ignore air resistance, and assume the velo fdxwn,5y 89q/v g+czbcity 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 frequenx3 m(0m :1hfiq5dczqncy 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 ,wnn * 7irxn)s$23 \; ^{\circ}C$ 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 ihtnqt 3:)/:e4-oj s; oo hdynkntensity $10^{-3} \; W/m^{2}$?

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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-dBebf79/tq k)pm*q7i eh 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 intensitiesua:qsjo-uuq2*a r e85 k v7 d7xw,cpd- of two sounds with intensity levels of 70 dB a- dxu78cau*5aqu swd7 jk,verp o-2q :nd 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 ofev czp+-j 8.p 6ht2iin a garage is 100 dB. What is the intensity level generated 2pezvt-io86+cjhpf .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 6jt nff ;n+q/k*.0 m from a source that is radiating equally in all directions i j+fn/;fk*nqts
$6.0 \times 10^{-10} \; W/m^{2}$. 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 distabp4 :j09hbsmj nce of 6.0 m from a source that is radiating equally in all direct 09mspjjb4h:bions 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 ofj0xoi;sp,3h- edthz + power, which is assumed to be uniformly distributed in all directions. What is the intensity level at a distance 5.00 m from jx id3sz t;h-e ,poh+0the 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 w.i jq /fkzpdw yc m,t/);9x6odistance 5.00 m from a barking dog. What would be the intensity level if tw ;jyxkzo9 mw)6w/cpitdqf./ ,o 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 inten1*xa kfpbz o5 *vhff65sity level is 60 dB. What is the intensity level (in dB) at a point 2.0 m from the source? Assume that the source radiah5zov6b 1x*5a pff f*ktes 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 distam:ez6g3 c.jfl 9xmsh,0m y0 jw2zd mo1nce will it be 75 emz0m9j y .hx3f ,6s djcm20mlg:1wzo 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 vq5k8oge5rh). olwwcj2.j70s bocl9f8 vt+o complex tone has a frequency of 1200 Hz. What is the frequency of the fourth harmoni8st7blr l0v2 5ogf9w c.ohe o5+vc qwk.8ojj)c?

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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 thb;; p 4leofuwfo;,c2 ie lengtheol cp;i;fu;bo4 wf2, of 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 thxb*gj n, e jhfmpx-w:s:7 si*(e frequency of the lowest tone that will resonate in an open pp,inhj egfb s*(x-*: jxs:m7wipe 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..b u*gr0qne6 a80 m. If the velocity of sound inu.n*a er0b6 qg air is 340 m/s, 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 te 3ro5 r n;29whuuc l*fhr)vk:hmperature 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 Hz. Wh8igs;g nl n1d,xhjo8h1mv89 /wqq 8ci at is the frequency of th8/8 qhg8 1ch91vmo,i xlnwgq8ns; id je 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 -efnt.waq su8 /mlt7 2on one end that will have a fundamental frequency of 60 Hz on a day when the velocity of sound iwqa2sf/ mlt.e8-7tun 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 temperatu;tcp nh;g 1wphbdt034x.qa)h 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 temperat14jm1:uwjlk(t,l rvm2 lexv;ure 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 in xotek hv i18bb-z:e:a 1is-f7air is 340 m/s. What is the fundamental frs1biae kfh:ti18 e: v-obx-z7equency?

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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 ohzr j5w q4b cswdc6rn( nj442,l+ j;bkn one end. If the fundamental frequency of the open pipe is 300 Hz, what is the fundamental frequeb(wscn,64n qzjhc +; wdjb l4rjr42k5ncy 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 velocity oyxmd+7 l6kxr0 f sound is 340 m/s. How much farther back would source 1 have to be+ r0d 7yxx6kml 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 y1qo2n 0sx un oja;4q9by 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 from the person to the other speaker? (The soyo;u01n a94n2j sqxqound 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 e9m nm4u .yybos1,yv5dfk/ 9z440 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 5xod4 zu* 1rzn-50-Hz tuning fork to tune the frequency of a musical instrument. If the tuner hears a beat frequency of 2 Hz, what is the frequency of the in zzu *-orx1d4nstrument?

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71#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The wavelengths of th.w2mr 7h4sug*raih o 4e sounds produced by two horns are 6 m and 7 m respectively. What beat frequency is heard when the horns are sounded on a dayom gw h27hsia44*ur .r 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 orchestra are found to p l7ei :56ptoidroduce a beat frequency of 2 Hz when a frequency of 660 Hz is played. What percentage change in the tensioni d5loe7 :6itp 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 1000-Hz sounena2q9062wru e y wv9cd source at twice the speed of sound. The observer 2nq6rwaewvey 99 c0u2hears 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 frequenz; cx ingyrhrp b+.6op7--d(vcy of 1000 Hz) approaches a stationary observer at one-half the speed of sound. The observer hears a (r6b+-x-cirng po.v 7dzhyp;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 movp- :)dv8u 9s )gqjpghies with a speed of 30 m/s away from the source, whdgp:spqghj) 9-ui)v8 at 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 35i :)gwf; r-jti 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 roadtg:if jrw; -)iside. 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 stationarytd2uw 4ce dp7-3q+s; xfz jhp7 observer when a train approaches with a speed of 30 m/s. The frequency of the train horn is 600 Hz and the speed of soujs- 3u4;p+f72exwztdd7 cphqnd 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 trs // y3 psp,jq4(szrtuain blows its 400-Hz whistle. Take the speed of sound to be 340 m/s. What frequency do yozyssp qtr/ 3sp/u (,4ju 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. m9k))1 1ahnhnd5tlp q The train blows its 400-Hz whistle. Take the speed of sound to a9mh ln d1h)15 qknt)pbe 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)0*a5tpe bm(ra;r0attt66 aj re b3hq km/h. The train blows its 400-Hz whistle. Take the speed of sound to be 340 m/s. Whab a0p et t6r*;(a)aabm q6t 30erhjtr5t 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 its whistle, andehs re ;5txv340gk71(o vcts k you hear a tone of 400 Hz. Take the speed of sound to be 340 m/s. W3vt;71 0ksxe teosc5(r vgkh4 hat 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 ):qcr4hw rc-yis 340 m/s. What is the frequency heard by an observer if the observer is moving cy ch w:r)q4-raway 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 500oz;n( c1ect0p:v pq d* Hz. Assume the speed of sound in air is 340 m/s. What is the frequency heard by an opcz1 (to;pq nv*0:ecd bserver 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 the speed of an bpw* t6o w9z23) nyxb*tn j.ciobject. A 40-kHz signal is sent out, and a 42-kHz signal is rex* . wpcinj23ybtn *obzt96 w)turned. 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 wave produkb 5i-xyla2(g+x 3g ehced 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 spee ( r0y cudp )5.xujytulf71fd a1)c.nid of Mach 1.4. What is the half-angle of the conical shock wa uyx7f.cpnta)y u.il 01dd 1u(5)crfjve 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 f:a)8neulf2 o v eo/t/wlies from the United States to Europe with a Mach number of 1.05 where t 2n 8e )e/wovof/ut:alhe air temperature is $5.0 \; ^{\circ}C$. What is the speed of the plane?

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