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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 wxa iy8+mq-im:a/ se6false 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 fasteo s *ogd:ck+p 18+csufst 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 st/)mv* /;i ff:ugwbdczeel 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 happens to the velocity of soj;(gp/vbkj ixr+w)6hro f 4g;und? (Assume thati(4 oxr;vfjr 6;jgkphgb/ w+) all 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 veloh rtwdom7 uuv2-+ p5-hs5 op7scity of a 400 Hz sound, the velocity of a 200 Hz sound through aiu75h-wp v5ptu27-or+md ohs sr 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 wavelengtz d))jh, yxfp2h of a 400 Hz sound, the wavelength of a 200 Hz sound i pfyjd,xh ))z2n 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 yuo tdip(0):c, kam)d 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 frequl. ip 1d*gp*ekency 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 emit,/:anqcw6 g4oh chn-uting waves uniformly in all directions. If you move to acw,n6 4a:gqh/oh -nuc 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 wn8 nd04f+b9gcj ;slwproportional 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- lp3xvomtw vlu/ba9+5qke-4 a distance d from the source is I. What is the inp 3qal4o vbl+9tu-x5k -/wm vetensity 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 sourcb 0vxc en6z1r)e that is radiating equally in all directions. What happens to the intensity of the sound? It reduces 1xb)ne 0vr6zcto

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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 radiating equally in al.dve, wag(-4fkdc sp6 l directions. What happens to the intensity la4.fps(kdev d6g-c,w evel 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 sounf.9 pbi/c y5nu)az*pod 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 speak*w7 brm9de q6ykgchm y::7z9ner emitting a pure tone. What characteristic of the sound incr7ghmqm:kw 6 9 9nyrez :d7bcy*eases?

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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 musiz7ho zc1q n64qcal 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 musicov .-u tljezdx(. j5lkz:a/ ,/z,xj zdal 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 into -a4 ld.ywck4h 6u s*vy66w;ol udq6ixwater

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19#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Pressure and displacement wavesbq; *7c dzyzr9 tel(73uy9 vqb 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 an.2opeu ds29i(;h cw:yfm q.p ed the sound wave generated by the guitar as a result of this vibration. What do these two waves have in comc 9uep e2:(f;d..yhqoim pws 2mon?

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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 2cd/t *bwfgdr. a7m4popen 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 pipew gk5 1ldv8q*lctr(0 l bjbc)n*;4b je of length L. What are the wavelengths of the three lowest tones produced by this pipe5q (l j)4bcld b*nkle0;t8b r1w gvc*j?

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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 pipe of length L is 200 Hzl6 t6nx, ecca9tn ;uqk wgk-yvzh*-36. Which one of the xg;y9khlezaw-n vt3u- 6n*qc 6k tc,6following 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 amr 6-ogf6mk2p t its fundamental frequency. Which statement is corre- m6 6fp2kormgct?

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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 closed at the ovgl k7e-f+qj 3ther, 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 len0; ys .dcdoqt59of:uegth L. What are the wavelengths of the three lowest tones produced by to5ud9.s;:t0q e dyfc ohis 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/kaoq.n9 os5z 3a3v5ez bm8hm 200 Hz. Which of the followi/zbeno k5 zsqmaa9m358vh o 3.ng frequencies will not resonate 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 funda i/xexphxrs23(8:tp secn25smental frequency. Which statementx25nexp etp:2 /hi8c(3ssx r s 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 byzhv.94+bey yt) 1hmdr the same source. Each speaker produces a tone with a frequency of 200 Hz on a dhtzr 4yh.)9 1+mbyd evay 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 ti g)trmf e/+f,wo 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 sounded togeti v 08w3cv) w9l 0wj.kcl,gldfher and a particular beat frequency is heard. What happens to the beat frequency if the freqww.j9 g3 0 0v,d)lc8wvcfkll iuency 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 expla2m: d:ekuujhtrrfr -2 ..du(r ins

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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 the0)p*2o( 3gbodo ffb bj obserj*fdop)0bb( 32og o fbver 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.1vl3xj4 8kdpwfw( t8l1*m mhg The frequency heard by the o t118vjlx(m4f l wd* g8mhw3pkbserver 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 decrease by a pzpckegalx2v(c zb d;90nw4z 6h83- ifac8 z0lp-(p2c ezan43 xbkivhc z9g 6d;wtor 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 xzm3n;2xm;alenku /(k/m w w4m/s. What is the air txue 3z(2wn m/w;4n;/l xkmmakemperature?

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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 squo .rarw7 ;h*peed 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/sh9phv uvhsk* /7gp*g wx)f(1 q, a bat emits a shriek whose echo reaches it 0.0250 s later. Howh**qh1 usxgv7gp p(w9v k/)fh 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 tempevne25;l n,sk t g,ggwaq; tyl+: -8lezrature 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 lightning, t k,.m -ryaehelx1i,u .he distance to the lightning strike-lh,e u r1,m.ix.ke ay 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 cliffto6 ddo(j7*eu 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 3fpmq/,h j56ir5c can well and hear the splash 2.5 s later. How deep is the well? (Ignore air resistance, and assume 3 i qhr5f/cj5pn 6ca,mthe 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 sm ji4 ,qhh;)t o43ujujound wave 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 a :6 z zjzlpd4t) pwzqvwv(2wxoo)zb,9z-io3-t $23 \; ^{\circ}C$ 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 intensity:v:ocn m64wavv)e wek5vt n27 $10^{-3} \; W/m^{2}$?

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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 70j3u dpmp 4p8l9-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 intensi3 0jp h1dqnpr)efb/h kb st(8,ty levels of 70 dB0fekrp ) pt/3snq8h (dbb1hj , 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 engines in a garage is 100 dB. What is the intensity zqbb ,(8xgms5f ka8*u3y so4 zleve*4fk bomx,5 zy8gb(saq3us8zl 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 fr)xti ;ivd5r0u j7rl xj :kk4-dom a source that is radiating equally in all directions is)d jl irrj0vt -: xku547dxk;i
$6.0 \times 10^{-10} \; W/m^{2}$. 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 r4*az8-iz ovyp adiating equally in all directions i48 zvzapoy-*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 149zfmo br6;) a/uq ooc mW of power, which is assumed to be uniformly distributed in all direction94)ro aq;/6zomoc fubs. What is 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 1f3j/.iz 7u xo4t adwta barking dog. What would be the intensity level if two identi . j473ut /iw1oatfzxdcal 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 s qcn,omau5 a+)ource the intensity level is 60 dB. What is the intensity level (in dB) at 5cm uoa),a+n qa 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 5n ncx+2px9 7yum 3ezb).0 m from a point source is 95 dB. At what distance will it be 75 enm bx3x29uyz7)p n+cdB?

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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 f10yuxan8bpdk zh6g ,9 requency oxb80uyngp d19 6azkh ,f the 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 third harmonic of an open pipe is 9tk0xe)57 vwkw00 Hz. What is the length wev 0t 5k7)kwxof 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.ih6yk5a+l 4w.y ghpw . What is the frequy6 .k4wphg hly wa.+i5ency 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 idwsk ira3 m79y+9y :oa length of 0.80 m. If the velocity of sound in air is9kw9ri ao: 3y7+dsimy 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 roomfk0+hv 6u:ptu 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 the . r. dh:d xx*p63gryvpski0p 5 eco04lfrequency of the third harmonp.kd5g v0 * 3xl.dpxihpryr0sc4:6o eic?

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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 pi 86nls.qysh.b pe closed on one end that will have a fundamental frequency of 60 Hz o 6.sbqns.8yhln 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 the temperature6ggdlj2ogulln4*m 1 o)6l :lb 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 te3g bt.i25hzh;c ykuu wos b684mperature 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 efrc9;c z :;dcwhen the speed of sound in air is 34e;zcc d :rc9;f0 m/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: u wk+lh y)f65fj52x*mrspo4jone is open and the other is closed on one end. If the fundamental frequency of the open pipe is5fw o uk pyf6x2+*hjmrjs)5l4 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 emit a frequency of 80 dm(yo6mv, x8:s;qagx 0 Hz in air where the velocity of sound is 340 m/s. How xmg(x;sva m:8y o6dq,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 Hzojzu np)3wx )). If the distance from a person to one speaker is 5.00 m and the person detects littl3j o ))nzp)xwue 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 isw,a27ej7p xqs t5t7. mozva3h 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 tunix9b1 dy01q ihd*bzl;3gwh fn -ng fork to tune the frequency of a musical instrument. If the *wh9bn 1z 0fd31diy;qhlb xg- tuner hears a beat 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 sound nbp tez x5vdr/.;5no7s produced by two horns are 6 m and 7 m respectively. What beat frequency is heard w;do 5 b/vr5.p7nexznt hen 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 violins in an orchestra are fosuea+ o.s+1iv und to produce a beat frequency of 2 Hz whenso+ uvi1e+a s. 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 1000-Hz sound source at twice tacyr ;-cbx,p ,d2ky.7znr8t che speed of sound. The observer8nd;,2backx p.t -c7,y yzr cr 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 s9 h0tau63w pxevsr1 m5tationary observer at one-half the speed of sound. The observer hears a frequency ovxw96hm1 t0e5a sru3p f

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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. Ii5my;5 pz huq4f a listener moves with a speed of 30 m/s away from the source, what is the frequency heard by the observer? (The sound speed is 340 m/s;pm45qzyhi5 u .)

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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 ise w:qc/v 2r7ef traveling at 35 m/s on a day when the speed of sound through air is 340 m/s. The car approaches and passee/ frq2v:e7 cws 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 hex,gkr -)h)hid8v b .xxard by a stationary observer when a train approaches with -d vg.x)rhki8xb,h)xa speed of 30 m/s. The frequency of the train horn is 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 traveling8zlu- nhi0).n 1wj.wp*a csfi toward you at 120 km/h. The train blows its 400-Hz whistle. Take thucn)i1. 0sp8f.wjz* wihn-a le 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 :m31sl x-npnp*/fi0 tbr 4l9s(gdqu: jszd7 zits 400-Hz whistle. Take the speed of sound to be 340 m/s. What td/sd(zpu n jb 0*:9 fslmz4ip-7ls1xg r :nq3frequency 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/h. pa (s7tqz0sf (The train blows its 400-Hz whistle. Take the speed of sound to be 340 m/s. What frequency do you hea pa7s t0(q(zsfr?

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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.vk(rhvg 6 e.f 120 km/h. It blows its whistle, and you hear a tone of 400 Hz. Take the speed of sound tke. g6hr vv.f(o 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 2n6pukc zi8wud0/o*n air is 340 m/s. What is the frequency heard by an observer if the observer is moving away fk86*c/ondw 0u pi nz2urom 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 s , :y2wgyg0crx4mi7 zgound in air is 340 m/s. What is the frequency heard by an observer if the observer is approaching the train witi gy7gx0,m z:w4g2rych 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 object. A 40-kHz sigmi0 7x.d7lh qmv b6ue(nal is sent out, and a 42-kHz signal is returned. Assume the speed of s0xdhi.v76 em7l(mbq uound 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 conical1zjs/ej *b kk7vudkam xx,/ (* 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 oc;2h um ax3- 0mftn4pmk+ih2tf Mach 1.4. What is the half-angle of the conical shock wave for2+m m-0x 32iuhtn;hkatfc m 4pmed?

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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 Ef 6c5dkj/a;u t d2/rdfurope with a Mach number of 1.0/d6 a j;5drck/t2duff5 where the air temperature is $5.0 \; ^{\circ}C$. What is the speed of the plane?

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