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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 fa 3so5th j/buxhv/qp/ 2lse 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 fastestl ffy. ,mw1(hm9g8ojx 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 irhf./so zi4: g- ly,iy4ej uw*n 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 airf lm,kk)s*ga 2 increases, what happens to the velocity of sound? (Assume that all othems*2afk, lkg )r 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 veloocub66 i+erb 7city of a 200 Hz sound through air ib6iru +6 b7oces

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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 H:d *r; zcjek+k33sles ejif;0 z sound, the wavelength of a 200 Hz sound in air il+ 0f;d k33ses;j:c z*rkeje 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 20,0lxg6*3(oq.-nmr dd k fvm.u ecv9r7 5x00 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 m 5sm wlg 8s107h2rjjmless 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 emitting waves uniformly in all direction *+kej/ awzpe1s. If you move to a point twice as far away from the source, 1+k /ew*pazej 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 divero6ws (z:*pr)d :h jjmjging waves, intensity 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 source at a distance d 0)oy+k :toqcr from the source is I. What is the intensity at a distance 2d from thekoc0 y+q tro): 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 (7*ifh wbn vu2from a sound source that is radiating equally in all directions. What h uw n(7*ibh2fvappens 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 j w/ 5gteqd 0uf.e(v 5a(a2lnmsound source that is radiating equally in all directions. What happens to ./ gf awaem(qt l0d(5unvj2e5the 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 s wf8/rqir7h p ew0i:(found 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 purev qi,-f,cpbt + tone. What characteristic of the soundp qvibc,t- f+, 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 note?ujx9xbu ;aoh9 pu1:0r

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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 no/ql) gt4nztxmsl md8..zvt; , te?

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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 watzy 4j+)czen(fa g .7 ; xm*d+zilrnyo*er

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19#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Pressure and displace7xzc;tjm8t: ,*flyb wment 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 generated by tz9lu; c cz qg2;e p /zty+4pupoz1y*s2oe0z m(he guitar as a result of this vibration. What 21 zo; z 0(y tzql4p;cug*z cp2+/myzpe9esuodo 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 both endir z 6-m;f*tszs, 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 wavelenp.n:/8dno d5mb0dqpi -nf id(*bs/ p ggths of the three lowest tognbnfs*oq (5d/0i/ddi 8pp n-. :dp mbnes produced by 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 resonate in an opewirs u 8bl5k5,n pipe of length L is 200 Hz. Which one of the following frequ, r5k5i8l wbusencies 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 kk lg8/by1x0u L is resonating at its fundamental frequency. Which statement xyu81kg b/lk0is 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 w ldrd;8;1temg ja(e6thich is open at one end 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 wavelengths of the thrn(uxv1i/opa;gy* m : xee lowest tones produced by this pivgu yn*/x omix:1(ap;pe?

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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 Hz(gc(is-zrcz /. Which of the following frequencies will not resonate in sz(cic/rg(z- 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 fundamental frmmvb77 sq6z-m equency. Which statement is correct?m-mzbs6 7 vqm7

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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 soucd(e *x5vzh*f)f z. jtrce. Each speaker produces a tone with a frequency of 200 Hz on a day when the speed of sound is 330 m/zzjd.5he xv* c) (fft*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,pme 7 j-rth:.dwpqiyh): ,yr 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 together and a particular beat rz./mmu 9qr(qfrequency is heard. What happens to the beat frequency if the frequency of one of the tonmr 9z.qr(/m ques 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 explyzmiy y t4//ua::ijn8ains

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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 ob3eib3 2rz e g(0n1nx+min k4efserver. The frequency heard by the observer i4 r2+izke fnengib3 x13m n0(es

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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 observ-kb 8l pq zkg)pb./az)er. The frequency heard by the ob)plkkz/pz.ba-gq b ) 8server 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-speeqidd6 6 7)wll.b.zifc4 2l otmd, its half-angle will decrease by a fd2f lili. l47cz oqt)6d6mwb.actor 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. Whapx 9fntwm2d6-8 -byuvt is the air tempera- w8b2xytfmnv6pdu-9 ture?

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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 o3c/btg.nly2sz,9m, 6rov0q pglfk.h f 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 t-jm bs3j9m7/mnpt9rm/s, a bat emits a shriek whose echo reacm-/r97n3s tmtj pj9mbhes 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 t+(g/jyg m2y; 2bmbs nphe 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 lightning, the distance to5y/px(tux:f6 lgj1se the lightning strike is aboteu j(1y5s x6lp xg/:fut

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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 thenvs89 vdc5rm-jyg+. h 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 )w9iav my;qy2h3cb 8klater. How deep is the welk2h;mc8 by3yvw9q )ail? (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 frequzz s(5bq;biu *cmfwh0 u-1(g lency 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 of2us xz6evdwmh* /ato+ le(5uj )(3h $23 \; ^{\circ}C$ 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 intensc k.ah;:xmk(h y.s o2city $10^{-3} \; W/m^{2}$?

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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 off ydx,4 da4 nj (yo:17ma,blge 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 sounds witc.vg)v*3 ik p:/1p y8wlpar e r*rqyhofa ;i6(h intensity levels of 70 dB and3 1rrpipwlyq*a8vrgaf v(/y6. hpce; *) ok:i 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 pzdmon w;. tte*: p15ilevel generated by one enozep dp.t :mt wi1*5;ngine?

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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 6b6:jof x3vmp radiating equally in all directions imxpjv:6o3 bf 6s
$6.0 \times 10^{-10} \; W/m^{2}$. 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 9bdp q;op.l9tf)v7zf 6.0 m from a source that is radiating equally in all directft9o);zp7v bq p.9ldfions 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 is asel(te,c xd.6a s.wjb5kis0 0dsumed to be uniformly distributed in all directions. What is the intensity level at a distance .,d5js tdxack0(0lew sb 6.i e5.00 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 em/g3xboqt3 z* sc4j4sce)y ,. What would be the intensity level if two identical dogs very close/34e 4gcs3cbze,) mstxq*jo y 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. Whatel8(0w ryu nf.k jw2. ur(bx:u is the intensity level (in dB) at a point 2.0 m from the source? Assume that the sour( r 8 wwjnu2ber.ykxu0fu:.(l ce 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 5.0ndcw3 r3/ pj5y+- po3yoq/sau m from a point source is 95 dB. At what distance will it 3y-wu +5 p3osypoqrad //ncj3be 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 towe,ggemg. o zp7+: *ifne has a frequency of 1200 Hz. What is the frequency of the fouze p.ieg, m+og7:* gfwrth 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 third1x;i1 e y n0woa(n)qgt harmonic of an open pipe is 900 Hz. What is the length of the pi 1xni;netq (0og 1aw)ype?

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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 pievl9 xdg1f8dpm 4ts,- pe of length L is 400 Hz. What is the frequency of the lowest tone that 9 md8s1ev,t x4gl-pdf 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 hyb5u:qzkdb i+c8p/ w z r(g/(zas a length of 0.80 m. If the velocity of sound in air is 340 m/s, what is the frequency of the second harmonic(i+bpgbq:r/kyuc zd ( 8/5wzz?

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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 temperaturyl(*d n+zzfe2(gc osvjl: g05 e 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 ai0ixt7ty ec+ ;t one end is 330 Hz. What is the frequenct;e iy70c+xit y 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 the shortest pipe closed on one end that will c xts8,e0x v,phave a fundamental frequency of 60 Hz on0x,x,8vtpec s 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 whervn5w;+ df/b kkwh;2t ge 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 /c6qpq4 gwm16 ros9 bdin a room where 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 in a+up v:mke6 99 eb6xuhsir is 340 m/s. What is the fundamental frequencyh6xeu + 9bsm :9ukpe6v?

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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 clvy fovw057v+qdafjk -r: ,q/yosed on one end. Ivoy k r/w: jq75q, avd+y-vff0f the fundamental frequency of the open pipe is 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 800 Hz in air where the vo33j5b8zs bw/0: ugamt58gp2wxq rzu+c)kf celocity of sound is 340 m/s. How much farther back would source 1 have to be moved so an observer in front of the sources wouldjc2azb r:u/+x u3o5kf g zwts)0 qgpmb 5wc883 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 th qz.37qrgdgqe5 ) vr4ne same frequency of 500 Hz. If the distance from a person to one speaker is 5.00 m and the personq qq)5nver4 rgz3dg7. 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 4-qa s4nfuvc5g*vz.k .44 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 to tune the/r6dmbln f lv74nn9+n frequency of a musical instrument. If the tuner hears a beat frequency of 2 Hz, what is the frequencln nb+9r/nvnf6dl7m 4 y 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 are 6 m and 7 m respectively)sw 8agsc1 l(a. What beat frequency is h l sg(asawc8)1eard 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 string jv4vwilf8*ljgn q:7.s on two violins in an orchestra are found to produce a beagf7 .v*w:nl vjq 8l4jit 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 1000-Hz )qj5d a2.dag-c5 qumgsound source at twice the speed of sound. The observer hears d5u)dcjqaag.g 2-m5q 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 statioh,3vzmsaf(( 6,rd kha nary observer at one-half the ma((fkrs3hvd,z , ah6speed 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 ojs +p4ks hs1 cmwmq1i;0e0xn1f 1000 Hz. If a listener moves with a speed of 30 m/s away from the source, what is the frequency heard by the n1 pmwsmc4;hq01sse0i1+j xk 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 dau)nkmats484li0y2; t8 g k/panvm g.qy when the speed of sound through airgkp2almus 4i.mnt8y4q t )/vkg0 n;a8 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 by a stationary observer when a traig**,,k;df jbx2cmv5 fe nmg46 e.pgdun approaches with a speed of 30 * kge*ndcv b2,jfe;u 4 mx6fpmg.g,d5m/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 traveling towa(rpx + emzx gd32.d,wurd you at 120 km/h. The train blows its 400-Hz whistle. Take the speed of sound to be 340 m/s. What frequency do d+ex(z gmxr32.d wu,pyou 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 staatwp ya-i ,08vr3j*l ationary train. The train blows its 400-Hz whistle. Take the speed j- a* yvlri0tap38,aw 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/h. The train blowxt1i/jq.ck nvo6 43e0y2qu gc s its 400-Hz whistv1.j2kg3x/u qqc 4c6 0ye ontile. 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 blows its whistle, and you r8jp jr912ab l6may9 shear a tone of 400 Hz. Take the spe9ar1 6 2r9b jjys8alpmed 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 ozju 6 vipl*d+dxi6m1- hy6c;in air is 340 m/s. What is the frequency heard by an observer if the observer is moving away frh+d pi-y*d16;vumz6 lji x6 ocom 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 in air is g hj u -5p77d( ayknphue60r1e340 m/s. What is the frequency heard by an observer if the observ e nu57a-hr(0 ehppd7y1ugj6k er 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 det9bwrubz r5- i-ermine the speed of an 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 is the object mob9-i uw r-5bzrving?

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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 pc +b ,n4(7 lo-thvdbgwbdn( m6roduced 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 Mach9wxabtk )3 rk ).jsx;n 1.4. What is the half-angle of the conical shock wave fo)9a)k b r xjw;3.stnkxrmed?

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87#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The Concord airplane fliesqeyba1e 7p5 b( from the United States to Europe with a Mach number of 1.05 where the yeaeqb(7b5p 1air temperature is $5.0 \; ^{\circ}C$. What is the speed of the plane?

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