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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 followi8pps / ivwl4wm:txk6c pu d37tgcqkn +ar/-* .ng 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 fastest s0rrho aar2o:, n:2s)cq 8k flthrough

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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 r-d 8fjcf dfhh:/n u,c1od?

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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 airl,c18g mw,own4a/ms p increases, what happens to the velocity of sound? (Assume that all other factors remaig,lm sca/n8p4o,mww 1n 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)qz6vi)a0 s ft sound, the velocity of a 200 Hz sound through air a6v0iz )tsq )fis

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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 of6wh1ts wv 6e8g)h8izg a 400 Hz sound, the wavelength of a 200 Hz sound in air i8sihhgev8g 6z1)wtw 6 s

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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 20,000 Hz are c. wduer12/zrbj)be7u alled

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8#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Sound vibrations with fre s 5pg;hi*v5ynquency 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 emitting waves unif5rmed. g -,ak(43ogdx po;wtpormly in all directions. If you move to a point twicdd pmpx4r3t,goekgo w. 5 ;a-(e 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 i6txtxi7*jl mv6 t( /dlc9jumv+*mn-o 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 source aq7 g9j;)3ta*z b gi1hip p4udut a distance d from the source is I. What is the intensity at a distance 2d from the sourceb7;u)zt319uqid gi*gpjpa 4h?

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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 7 *fxfjk23l)i61)phel s tlodequally in all directions. What happens to the intensitjli 7) otd* )plse6lh3ffx1k2y 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 that is radiating e vl ,noq8i82j rri:g(wqually in all directions. What happens to the intensity level of tgoi82rn, i: (v8wqrjlhe 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 bvxzdv w(l j/ 91 hqud;aq9v3f2ecomes 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 w i61ixo-2m xkemitting a pure tone. What characteristic of the sound i 61wk 2omxi-xincreases?

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16#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What determines "loudnes3uc5ioj h*k+j0hf dh* s" of a musical 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 musical notef 3j ci5t9)x:x mvh.zo?

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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 int f42*e-n)d5w tlnvqs wo water

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19#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Pressure and displace5 s4bp/3qg acyment 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 jou * pok6:1cv4vkpb,ep, a+ hthe guitar as a result of thisvv ,+k6:aph4p1ob pj u,oc*ek 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 o3ncx7vbq/x f5y;m;b) xykp4xpen 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 w7:ivdofn 4mvhly7 00the wavelengths of the three lowest tones produced by tlv7 yio07w dhmfv:4n0his 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 pipe of length L is 2 lf5rby cjgr20x;h0b.00 Hz. Which one of the following frequencies will not cx.fbyj20r5hb ;gr 0lresonate 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 ih ,nacw7l, m 3nkw2;da3nt z0es resonating at its fundamental frequency. Which statement wk zlt0ehn w,3;72mn3cd,a a nis 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 end and closed at the other,rz) e4mp izywd)f y0;- 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 leswa;aoirv63 * 73qxorhcj9 ft, ,t 5y.on pv;vngth L. What are the wavelengths of the three lowest tones produced byvh.o5a*7 i3v6tp , xftjc, yvsqnoarw;o3r;9 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 leng9lw)3zxf +v5qfmcub , th L is 200 Hz. Which of the following freque u) zf+qmv59wxb,f lc3ncies 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 resonatingo(g*hnn zy3a 3 at its fundamental frequency. Which statement i3gh(nno yz*3 as 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 spea x:tz df7vgidn53-+flkers driven by the same source. Each speaker produces a tone with a frequency of 200 Hz on a day when the speed of sound is 330 m/s. The p3fti5 g vdd-:x 7+fnlzerson 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 should had6*0dl v8ux :nl0qi pive

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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 particulaxq p*9 w4/z:g k++ zxb:zijsyzr beat frequency is heard. What happens to the beat frequency ikqgzz9+*jbi /swyzp:+4zx x : f 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 explainsih83g9vd:,et,vwpb5po , qd n

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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 stationardcj .bra1-6.a4sd io dy observer. The frequency heard by the obser.. dasjdaord14 icb -6ver 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 statioerw;:b:, 4oqxsev5 zrnary observer. The frequency heard by the observ:vrxs br,4eewz ;q:5o er 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-ang ehdpspnh 4p .q9*rptcne.o,ut0r ;+9 le will decrease by a factt,p. 0ph;pp q rdcnre4 *oetsh9+un.9or 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. What isngz)y1qg05e5k zegw 4l t2wa7 the air tempergakg7 z 42)l5e0g5 1nywwze tqature?

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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 in air at rpxbw* i3o4e) $0 \; ^{\circ}C$ 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 emits a shriek whos- ts1tt95pszo s)uy(96 rsulne echo reaches it 0.0250 s later. How far away was the object that reflecplsu169 sts9trtny5s(o) z u-ted 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 ihe2dh,o0wdn47i *4goka b wh;s $0 \; ^{\circ}C$. 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 am3hw/ak(:l t s flash of lightning, the distance to the lightning strike isk3mlwt( hs: a/ 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 te6 a r6xthfr2a( tx85ukmperature 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 sprcmiexg9 : b 3wp09) bc45dvlater. How deep is the well? (Ignore air resistance, and assume thew4 : 9eg9) c5pr0mbdsvib3xcp 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 wavo h6mr rui/z2*e 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 at h)o qk+mzdf7 pdm48/j:po2lq$23 \; ^{\circ}C$ 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 p*m5diao/ m*(h:n ts pwith 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 of a 70-dn8revp /g6gxax( (p/zB 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/ot4lha t 69 x9fsc)cu sounds with intensity levels of 70 dB and 4fox)9c6c tsatu9l /4h0 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 int(l-ncfw):+;h dzp j lkensity level generateddl+(zf pj );hnkc:-lw 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 kx1+ mz2 ree7zoq1fq;m from a source that is radiating equally in all directionzkz1x q q1+72 ;eofmres 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 distancz,co qcxxh) 0g3-* ylwe of 6.0 m from a source that is radiating equally in all directoc x l3h)c0qy-x,*gwz 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 is ass-z 0,oc-shyqyq*m 4m mumed to be uniformly distributed in all directions. What is the intensity level at a distance 5.00 m from ho0y-4q*s -z, cmmqym 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 barki f;+)jkdlxbd/ng dog. What would be the intensity level if two identical dogs very close to each other are d ;bx+)flkjd/ 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 qy ji3 7z79cis1f:qxs nib:2jfrom a sound source 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 ra 7j3cq791i2zs jx bni::qsiy fdiates 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. v/po0af4 qy 4mAt what distance will it a vof0 y/4m4qpbe 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 y b(pwp.obs(i49a 2z/ c(pke bHz. What is the frequee/bi 2kpbp(4p( ycb o9w .za(sncy of 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 900 Hz. What is the ldcvgw.ad-ikp)4l vm52- 9l lg ength of llgiadd v 5)--gcpklmwv2.94 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 Ljxv jmz+4uq) 0 is 400 Hz. What is the frequency of the lowest tone that will res04jvujzxm q)+onate 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 a a./k wh:5yiwcx5vtc -t both 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 s.hwv waiy cx :/5-k5ctecond 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 roomkjyskvwz: v6 ep+n h2d1k (gw/ 5v6s4a 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 atu/jlemri8n+ l 1s:qw)mxp x74/wwc)g one end is 330 Hz. What is the frequency of i lm q we1)n)cs xmu:l+jpw47x//gwr8 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 closep2o1pa,xlmgwo ) +-x9 on hqi0d on one end that will have a fundamentm ,loan+0 xohp)o91 xqgi2pw -al frequency of 60 Hz on 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 temperature is5;xl8 xux0hv3bj y no h329y k:ubef1l $20 \; ^{\circ}C$. 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 teml yz ,*gx jv1mlw235giperature 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 th/ kf;f c3ha/a 4qofnv;e speed of sound in air is 340 m/s. What is the o 3f qaa /kf;vh;/ncf4fundamental 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 c :rtr+25zg:cl 0btws length: one is open and the other is closed on one end. If the fundamental frequency of the open pipe is 300w tr s5:tr 2cl:0zcbg+ 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 velocity op 3z8cfdae+ttmh3b: dq m,h3; f sound is 340 m/s. How much farther back w,h3: 3 zbdqmfe hct a;mp+83tdould 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 dr; ugl +n(ykn9ziven 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 sound speed; n9zkn( gluy+ 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 the beatf(z4uure 6 k/q+y9aiq 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 pg4x6jal* my)to tune the frequency of a musical instrument. If the tuner hears a bea*pj6lgy4a )xmt 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*kl+qdp r*;zamqjg-fof f4 ;6 w.v mw2s produced by two horns are 6 m and 7 m respectively. What beat frequency i6;om; *4zj-gkw*drpq lfwfmvf 2a. q +s 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 *:h tqx67hvae 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 the tension of one of the strings would bring them to the saea h*ht:7vq6 xme 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 sourji as iw aan47*.pi.t3ce at twice the speed of sound. The observer hears it4 .iaw7j npi.3a*asa 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 stayh,f5/l9 a-m 3m:t ene3afwg td1fa7qtionary observer at one-half the speed of sound. T-ewq5amdag 1haef3tl, n9f7:3ft/ myhe 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 otdvhu/h ll:51f 1000 Hz. If a listener moves with a speed of 30 m/s away from the source, what is the frequency hhu/5 :tll1dvh eard 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 travexox7shiqr 4*l6 tb:. aling 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 roadside. What change of fre*xa4oth7 sbiq6 l.xr:quency 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 statioedwa p-s-- ;,s4ss1kzoj )ayaeq8 ha7nary observer when a train approaches with a speed of 30 m/s. The frequej 8 -a h7 );ae4qw-s-padsezka1o,s syncy 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 toward you at 120 km/h. The train b5v*( l di/tzb fe9,1ygi8i epalows its 400-Hz whistle. Take the speed of sound to bi5z ie agl(/ i89 byfvet,pd*1e 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.p*vk; - o 7,lepecnb+b The train blows its 400-Hz whistle. Take thklc;n-b o evbp+p7e*,e 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/h.:zecn1.sv5ve(-pmiqt)/o uj The train blows its 400-Hz whistle. Take the vv: tuo1p qmnc/ e(- .jz5)iesspeed 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 froki118pvjeaqu89t- o s s.e3dqm you at 120 km/h. It blows its whistle, and you hear a tone of 400 Hz. 1q 81u qpki3jevs9ot.8a - sdeTake 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 / qd ,b,jugt (d j;k9p*,to1kwqcnf0dthe speed of sound in air is 340 m/j;/pf0qgt*bj (,uqto,k9dkn 1d , wdcs. What is the frequency heard 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 jlsc y d) oqgaa/f/k.46azb:1is 500 Hz. Assume the speed of sound in air is 340 m/s. What is the frequency heard by an observer if the observer is approaching the train with a speed of 30.0 ma 6/yacsfq dk1)zlj ob :g/a4./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 o3x fgf(b-en u2 hv mqy;gy*-:df an object. A 40-kHz signal is sent out, and a 42-kHz signal is returned. Assume the spee n-eq gxg:d my(uf23byv-;*hfd 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 produced by a supersonic aircs1oy6d -k hy;8nos-c 58boj rwx*qmk ;raft 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 wg4g7 lu*eean ,i(t)ed of Mach 1.4. What is the half-angle of the conical shock w,wule en g7 4a(gt*)eiave 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 flies from the United States to Europe with a6jxh,c3yhg v- Mach number of 1.05 where -yc,hxvgjh36 the air temperature is $5.0 \; ^{\circ}C$. What is the speed of the plane?

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