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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 f:yyq0yq2 +ace yzdn2 ms/k,-ralse 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 cond*ljzt5i - i+gry(oxn8*be nc4y56 aqsucted 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 rod? -3lu 9ha)araovsq 0/d

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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 veloci3 mjymd6+rbaj;s+ gz/ty of sound? (Assume that all oth jjz+y +mdasm6/;3rb ger 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 200 Hz sound thz8 eyooqxsf9 3,y. z: c9hw3xb4 /qfxmrough f3.3fzeym9oqx9:y,w/cxz o 8sxh 4b qair 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 yj.nbno kw *;2of a 200 Hz sound in ; *nn2obkw.yjair is

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7#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Sound vibrations with6s,;fk0do2zzp lny/ b frequencies greater 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 than 20 Hz g-b/dgyex )m mu.mf2tx27f x4are 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 directioi6 lq,n jx5on,ns. If y6x,jn,iq5l onou move to a point twice 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 propo9 jl)1a (agk+iocg j:)gp nl5o(e7f1p( kklvsrtional 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 sou.t7 yrsjn9i4yk/b 9xuka2im :rce at a distance d from the source is I. What is the intensity at a dis 9 7ut:ayn9/m i.i4x2kyrjbkstance 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 x:97nf n) -fij.+l hosbixb :mthat is radiating equally in all direct7hfx. l+i:f s:b obnixj-)mn9ions. 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 tkr).:z q: zcexgw85 cmhat is radiating equally in all directions. What happens toezw5c.c km zxq:g)r8: 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 sound becomes louder?zus n))-rx 7ilvd06v2mv(e tj

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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 emitw1 fn4q ah9wg:ting a pure tone. What characteristic of the sound increasf9q14w :ganwh es?

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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 6nil3+gaq+ lxical 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 (.t/ 8wjr wo.)xd1t y5qruzoma 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 af.:szu2j x0zl ir 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 wavesw ;b+mdrt hr-5 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 b gitti,b v)+l*)7amq the sound wave generated by the guitig t,)tb lv 7*qbmi)a+ar as a result 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 tp p .5 .-0p/xlvcwrkkopen 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 length L. What are the wavelengths oq5dpynj*- l8:dk k.2xxm lw.of the three lowest tones produced byq5.pdd k8ly k:jo.*mw n xxl-2 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 resonatz(d;g hyi+81 wtygkfv.+jv: l e in an open pipe of length L is 200 Hz. Which one of the following frequencies will n w+kj (y+fgv8: 1;vdhl.ytgi zot 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 fundame,6y umi pt o4x*4gs,scntal frequency. Which statem6u4c4 s*poy m, xgst,ient 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 e ekr* ,ny:i2mx03vjxgnd 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 pio)ri9tegx s c :o8fzn: 2han8)pe of length L. What are the wavelengths of the three lowest tonee)i8xf2nrtag: s zo:9 con8h)s 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 r+ jkwu qn80i9sesonate in a closed pipe of length L is 200 Hz. Which of the following frequencies will not resonate inqj9i0+ u8s kwn 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 x6k*2ivj i 2 z1:ecjhvn25lutend is resonating at its fundamental frequency. Whinii:*6l cxhj 1v22 5ez2vk jutch 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 ,h7 qzajb0 -kfbqb2ud8pr 2e;the same source. Each speaker produces a tone with a frequency of 200 Hz on a day82 -fbzqk d rj,e2au0bhq 7bp; 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 shr0qx1 n4 u/ vh(c54usfku.h isould 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 freekvmggph.s5(*r7fum o y;;7t quency is heard. What happens to the beat frequency if the frequency of one of the tones is increased* kpt ;e(g7mu o5hvmr y.f7;gs?

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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 q2bpih85y(*upsld, ulains

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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. 8 dc3mawd:r.ki 54c jxThe frequency heard by the obse:rw 5cjic adk3xd.84mrver 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.*ko3 mg pa8na,jt t07q The frequency heard by the ot3qo g,pnj 07 8*mtakabserver 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-anglmbv d ll/e*;7qe will decrease by a facl b/v;del7m*q tor 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 soundneu i*a.h)/sw of frequency 45 kHz in air is 352 m/s. What is the air tempe) is/ .euwha*nrature?

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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 sound 6f,ijdkt38kg3yjyji ,u* k m0 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 u3daa,7ej1d v*5upx min air is 340 m/s, a bat emits a shriek whose echo reaches it 0.0250 s later.dd ,1*u xu3mvj7a5 aep 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 the echo in 4.00 s. The temperature ilnr(8g96yzpc( 5 th xbs $0 \; ^{\circ}C$. 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 fl ehn(ccx/ (m,uash of lightning, the distance to the lightning strike iun,/(mhe x(c cs 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 frombczux/ 063i4kccv x3 md0 r2ig7zz( xm 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 spl an3ks(khm8 , +qood;phig9i/ ash 2.5 s later. How deep is the well? (Ignore air resistance, and assume the velocity of sound o; m+/q,93i kd inh ahsg(8okpis 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 frequency 500g +tgynq)7:y6hezcm * 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 a;37sod .pbw+z m+ y7fdo 6zebwd0enf8ir 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 of a sound with intensi*g2xjt1h i2j3eve h3kty $10^{-3} \; W/m^{2}$?

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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 7dk3ufj o 9a31od neo 2(5n*zsm0-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 xbxqp9x 3+d14cgju a,sounds with intensity levels of 70 dB aa+uxd 9jxxc p3,q 4g1bnd 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 engineo02q 17s- l pyu2jato o;e+xcks in a garage is 100 dB. What is the intensity level a2oxjls ouko+c- e yt7;qp 201generated 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 radiatbw8j7i3o:oxpo( u 5x iing equally in all3:bu pjwix8o x7ooi( 5 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( 4-tlwbn c+ki from a source that is radiating equally in all directcb t4ln( kw-i+ions 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 is5 dl( rq 4ituo)w*ha-vorar80 assumed to be uniformly distributed in all directions. What ir *d0ia8vtu5hr(qa w)lro4 - os the intensity 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. Wha;r4ml vqd30c ft would be the intensity level if two identical dogs very close to each otherflrd qcvm;403 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 sourcerkwrsd/a *u* y 9 u1 cjhds.3die28*yy 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 radiates equally in al/ydu9* 3 yjkd2awh1 * sr*cdr.se iuy8l 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.(mpv8i:q(lu0 nz 8vl;mu3h sv At what distance will it80unplzsu (m3hl(qiv8:;vv m 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.2rez5cpiv,b qm8fenya -3 9t / What is the frequency of th mqfrab i c-vnp 358y/z,te9e2e fourth 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 thir,q hch+z h71wkd harmonic of an open pipe is 900 Hz. What is the length oh7khzwqc ,+h1 f 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. Wha0q hv,d.ez y,qt is the qvz0 ,ehd y.q,frequency 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 bopqv9)*l( m;1tzl yml6u3flevth ends has a length of 0.80 m. If the velocity of sound in air is 340 m/s, what is the frequency of the se9l( v)3lm 6;zlfvmtqpl*1y uecond 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 roo7pwlc h*mo tn,h;u2;9zgu +ef m 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 end is 330 Hz. What is thq2 (lo+kdioam x7 +qvay u1zr)8jv ,0re frequency of the third harmo r+ylv,u)i0xz d8 +ava2m7oj1qok q(rnic?

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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 shortsahde429aa0yw*e84-j m .q 9nhymi nzest pipe closed on one end that will have a fundamental frequency of 60 Hz on a 9 2a y9s-e azd0i.hy48qh*enjmnm w4 aday 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 temuw* c6m8x,,zf .opo yrperature 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 w vt-kdo32byd+here 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 sou(ru )gyz18 qmznd in air is 340 m/s. 8)g(mruz1 qyzWhat 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 aqc4ibc 9xd/uwe-4uj1s 33 k icnd the other is closed on one end. If the fundamental frequency of the open pipe is 300 Hz, what is the fundamenta3- cc cb dus1x4i9w3iej/ k4uql 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 frwfxr/rm 259jb equency of 800 Hz in air where the velocity of sound is mfw25rxb/j9r 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 side and driven by the same frequency of 500 Hj5rbezo s.0fn+mx2* xz. If+.jobr ex xnz05f2*sm 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 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 td3xy qp92sw uc4,h k* jv6dwn/he 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 to 2grwwn4e x6o 8tune the frequency of a musical instrument. If the tuner hears a beat frequency of 2 Hz, what is the frequency of the instrument? o862xnwewr4 g

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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+.xicr nsn ,ow.lb 7 o34mnlr0 two horns are 6 m and 7 m respectively.scw.n3lio4n 7r ,oxl+ nb.m0r What beat frequency 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 39bl1c7 tccoi two 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 in th9cot71 3l ibcce 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 101*k w pm-rv8myqiz+x l;6 -qcq0 fjmi900-Hz sound source at twice the speed of sound. The observe zjmf8 m+0m--ry iq69iqx1k;*lpqc v wr 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 m.u fpwcz3* ux:0(gpc Hz) approaches a stationary observer at one-half the speed of so xp. uw0mcf:u(z *gpc3und. 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 spe +s5b6+uzql:umg-bkf8jqe -5 lpc:ld ed of 30 m/s away from the source, wu+ulb pe-m8-jq bc g5f:+zlsq6l5 k:dhat 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 35 m/s on a day:- atuaujkx7 yr*h3qoh+wc44v*h 4qc when the speed of sound througrxo4q*4ac h+y - *7 :qvhtw4auhcku3jh air is 340 m/s. The car approaches 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 iv7 xoi0o 54 sioj/i+h82yf *ram nol1by a stationary observer when a train approaches with a speed of 30 m/s. The frequency of the train horn is 600 Hz and the sp47 2soli+/r xi1mfij0a8 ioyoh5 o* nveed 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 yoqaq8c).) c5 vj m8ygisu at 120 km/h. The train blows its 400-Hz whistle. Take t j5mys)88c.iqvgqc )ahe 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 itsdx3l0p-wo+i yr )jzh4 400-Hz whistle. Take piw)l -dz +hr y4ojx30the 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/f2u08 ght ct4yh. The train blows its 400-Hz whistlef2y httuc 4g08. 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 away from you at 120 km/h. It bl5ch ,.+17)jd qoj(utdx.jq1p mjh zbsrsv3(yows its whistle, and you hear as+j7p mhhx.1,sd5t( (ujq b)vryjo z3qdj.c1 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 horn is 500 Hz. Assume the speed of sound in 3f,9 cik:rzuj air is 340 m/s. What is the frequency hur k:ci9j f,z3eard 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. Assume the speed of sound insah ;..88mt +uvksk sw5:nucf air is 340 m/s. What is th+sf k :cu;5nvukt..msaw 88 she frequency heard by an observer 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 determineoyhjy*zl, wto,*jx(0 the speed of an object. A 40-kHz signal is sent out, and a 42-kHz signal ijwt,yo* hljx0(,*o z ys returned. 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 cojbgtwifh ;n6hgr3pn7 (kd /26nical 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 speed of Mach 1.4. What is the hn)h*oetguz+f bn 9 gr69/ktghv*ai 70alf-angle of the conical shock wave f9b9g**nt /o zihft7 varkhg e0u )gn+6ormed?

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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 nem)k5lsljdf621k z q/(b dusu9g) (giumber of 1.05s qzjd)kkgs1lfm 95b il(/ gd)u 2e6(u where the air temperature is $5.0 \; ^{\circ}C$. What is the speed of the plane?

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