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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 rrl-m4 x)+a+bx- + exfrm +msgis 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 thrwrmb; 4l7z,paly-: a gough

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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 stee*, b2:sy t;dt1cax qh*jpy ts7l 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 of4 d-ktc uy-js* sound? yjd-t*ku4 -sc(Assume that 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 velocity of a 400 Hz sound, the velocity of a 200 Hz sound throqpjn6d*n f p+vg,dj-sr *3; jhu pg r;nf3hnvjsd+6 - ,djj**pqgh air 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 of ajx:0 zl5yzg(q4hyow 4 o:a5su 200 Hz sound in airax y:4o0 y 4wlj(:zqshuz 5og5 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 grea9 vyo 2gvqoz91 vooz,-ter 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 wit8r (h5lqxa nvrz0m7b0h frequency 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 uny (ssmb2ac/( axbo4:l h/9ba7v cx:yp iformly in all directions. If you move to a point twice as far away from the source, the frequency of the sound h aospl/2:vcb:a/a4xc(7yym( x bsb 9will 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, inteej6,d brb:g3f nsity 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 distancec-- 22uajo vkw d from the source is I. What is the intensity at a distance 2d from thek j-- uow2ca2v 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 g8 p8ix;hjvs 9i7b8ry yu8hjf. (1h githat is radiating equally in all directions. What happens to tbrv1 hhu(8pis ;if9y8jx8yg .7g8hj i he 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 that is radiating equally *uc 1ko9pkqu /in all directions. What happens to the intensity level / cu91uk*q pokof 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 w5ydwe4 5ll )fpld9 3pbecomes 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 em ,nho6(1c kezgitting a pure tone. What characteristic of the sound inoz,hk c6( 1engcreases?

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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 ofr.7ja+atz onq kwar48-; t) 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 "pi; u1l0afvh+ m: apt c38q8oe3doh0uuwtch" of 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 into mt hocu3 x*kaiv/ -5g5water

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19#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Pressure and displacement wave(z,x6 cvbmw66 g0*hw l7q zdremp2+qz s 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 +iu( +rhd;svr wave generated by the guitar as a result of this vihvs +;r(uid +rbration. 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 both x-((ns ifeg,qends, 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 l nd(l+2 m4ek; agrub(xength L. What are the wavelengths of the three lowest tones produced by this pipnk2+m4urbg ;e((lad xe?

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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 op+aw wru4* j3ny:efd z8en pipe of length L is 200 Hz. Which one of the following frequencies will not resonate injra3n d8w *:fwze+ y4u 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.o; 5 / u/owstp;foil,m6p*lsv Which statement ipms/5fw v l/;p,ou;6t*soo lis 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 close9 ;452dztnufelgpaa76 br ts 8d 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 pipk -4:2 wvpqnuxq q8f(j0r0mt pe of length L. What are the wavelengths of the three lowest tones produced by this piprq8vq: p20pqmnf 0t kjx(w-4 ue?

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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 h;mgpo z, 5 x(fics*q,ru.ll/a closed pipe of length L is 200 Hz. Which of the following frequencies will not resonate i*qpc (mfog5szx/,,rhul.; li n 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 kb)q5 wqyk3rj24/m jlfundamental frequency. Whic j23q bm/k)r54ljwqk yh 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 spe isdowbe5k5yl.ks 7a v)x5zp(:z;d5takers driven by the same source. Each speaker produces a tone with a frequency of 200 Hz on a day when t75 sby; sd a5)d5z5k:it lezvkowx.p(he 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 shou7: mofuji o3,)djti2 zld 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 msxh)x ;z pe3z bba:0/frequency is heard. What happens to the beat frequency if the frequency of one of thep e/zxbz ms0 )ha:b;x3 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 explain),pu6e h par,jjzf;g a/d06bjs

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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 b4yn4rr 8xysl 0y the obserrl0n8r4s4yxy ver 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. Tx:jdmx qt mv5p )e8iphyr84rr4k1 y-,he frequency heard by the observer ishxr)m1,854:qp jt8ey-x r4 pvr km dyi

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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 MAgxb)t7d3 l 0sdCH-speed, its half-angle will decrease by a sbtd7l 03dgx)factor 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 frequen0 x2kku0 1fd 2i9-q rmtt:zisgcy 45 kHz in air is 352 m/s. What is the d xs z 0t9tg-2:qki1f2i m0kruair 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 speei5:;o jpp d(azd 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 )4cywpu7)nb5 x bgqz.is 340 m/s, a bat emits a shriek whose echo reaches it 0.0250qu5 cx7.)gy)npzw4b b 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 the echo i gugs r/j7kr(j3ylb 3*m7ewn8n 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 f zxgqg1+b ;zb,lash of lightning, the distance to the lightning stg;z+xqz b1b,g rike 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 fromr.mi(b.-1n 8*kj jxs,p x pjhzf*a;mz 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 splash 2.5 s b5 fm.ct)bsi.later. How deep is th .bs 5cf)mtib.e well? (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 ai, r7jm/p sg);bo y+atwr of a sound 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 airot26 h,ey l: oe.wll(,yqxdp0 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 l)2mkp 3 ksqgb0evel of a sound with 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-dB sou3e5om cts9a7)yihng 0nd?

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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 i*weqy +i6sfe06z/edn ntensity levels of 70 dB and 40 dB?6ne0+i d/qe*ewfsy6 z

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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 1sxq x a3 4r:ytg1hos-/5 engines in a garage is 100 dB. What is the intensity level generated by /s 1xoqrxyat hg: s3-4one 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 *k 4xywenb2x dutv+)( 6.0 m from a source that is radiating equally in all directions )evk+*x w(xdb nt2uy 4is
$6.0 \times 10^{-10} \; W/m^{2}$. 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 radiating eqnel n:u c tid:7dw;kz 2zpu 0;cf34t/qually in all dirwniu27::3pz;en zkctq u f;0d tcl4/d ections 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 9f wmf+i vjqth9p)my3l,13 nl assumed to be uniformly distributed in all directions. What is the intensity level at a distance 5.00 m ,f )m+ wn9mv3ltiyp3jhql91f 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 di 8rhp8 kfi aqo243kd4nib+e)ystance 5.00 m from a barking dog. What would ek+8 y4nb24 d)pi8kai ro3q fhbe the intensity level if two 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/w42x x+agw .jp fwp; -d)liap intensity level is 60 dB. What is the intensity level (in dB) at a point 2.0 m from the source? Assume that the so + p4pwx g)a/2lw axd;.i-jpfwurce 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 5.06 axzo6 7eo7qil0h;gd ys/l6p m from a point source is 95 dB. At what distance yld0gp6;hs 6 ox677o/ zlqiae will it 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/v 5/ti*c wpgd has a frequency of 1200 Hz. What is the frt /wcp5vd*i/gequency 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 harmtx3au9hq48cm onic of an open pipe is 900 Hz. What is the length of the pip9 tc48xumhq 3ae?

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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 a;z;zdpl5 tte/ ))tpk t4axs3nn open pipe of length L is 400 Hz. What is the frequency of the lowest tone that will resonate in an open pipe 3adp5etsx)/;t ltz;n4 k)tp zof 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 0.80 m. If the velocity8 vy/.2uk vx2 kqma;aw of sound in aiy vkv;xq 2 a.wm82a/ukr 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 q 6nzvsbgb3gv,7c/; xuuo8uj f 2ht+.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 freq4/(o ewcp-nca +s(4mwqainzi.z 1ez, uency in a pipe closed at one end is 330 Hz. What is the frequency onm4aw+(i1zinc e wcszq, .-/ep a4o(zf 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 c;.-qye jx1zx cn58aqhlosed on one end that will have a fundamental frequency of 60 Hz on a day when the velocity of sneahq;8yxx5 1jcq -.z ound 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 t m)ywd4;9ma agemperature 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 temperatx,wxzdu 5l 9s5ure 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 lsxkn u.3 x5w;y6 esll* 2sbq/ttoe8c-ength 0.75 m is played when the speed of sound in air is 340 m/s. What is/ wt ul3c5-ssbqk y*xn 2l6sox; e8t.e 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 o b+4d nvga9j2ff the same length: one is open and the other is closed on one end. If the fundamental frequency of the open pipe is 300 Hz, what is the fundamental frequency ofa9jv 4 bn2gf+d 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 velocittflid f+nada8.l3(2l z5v zd :y 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 wo:i28lt d vf.n l+ dad(z3af5zluld 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 9zo 6bk-rsv 8vmx4u6pby 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 possibleos4rv6-9xbvzm 6 pu 8k 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 Hz8qi3n75ohu qj 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 u/ :s1u.w /orwhha; peoi4v0s550-Hz tuning fork to tune the frequency of a musical instrument. If the tuner hears a beat frequency of 2 Hz, what is the fivorh;h 1 swso w/a.u/u :pe40requency 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 c 9gsgyn. .d; s2*1 5;hhef-xbzdqlnp and 7 m respectively. What beat frequency is heard when the horns are sounded on a day when the velocity of sound is cp.dg f-y9*sdqenb ;5h l2 gn1zx;h s.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 f( g,rc p37bpeviolins 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 ,(7ep r3pbfgcthe 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 soun d,t6gwm9d *nv17mjc)5 w ia27h yibfid source at twice the speed of sound. The observer hears a frequency o *ti1 )7,fbg2wn a9i7ihycmmdv 65 wdjf

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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 frek; gg)9 pipgm8quency of 1000 Hz) approaches a stationary observer at one-half the speed of sou8m9)p ;ggpkg ind. 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 12*4 c/1p ux3 0ud0snje e)j8fy wqpiftbxp0rof 1000 Hz. If 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 ipxn3p 4/i2jq*ec1 fe u b0 p)dwju xf1yt0s8r0s 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 when tp lss h+ 4y*z4 ude7mzp/gr(r)he speed of sound through air is 340 m/s. The car approaches and passes an observer 4/l7 gr m z4pdepz+y)huss*(r 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 train approachvc3 x 5w*.ewq ijohb k9z54u7ues with a speed of 30 m/s. The frequency of the train horn is 600 Hz and the speed of sw9i7v4bzek5*q co wx. h u5j3uound 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 km2yrq 9xppgg0.ve rz8;3 utae -vh t.p)/h. The train blows its 400-Hz whistle. Taku38qp2vpegr.ygrvh e z 0t-;p a)9 t.xe the 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 its 40u** 4pgm+sm5d:e- is .rex vil0-Hz whistle. Take the speed of sound to be 340 m/s. What freiedev x usm* i5.4*:mgsp+l-rquency 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 blows itqm43 s/qc( ny)itcw ap rao647s 400-Hz whistle. Takc st3)wmanqqyri /c6o44a (7pe 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 fro0q pbr(r3rn:g m you at 120 km/h. It blows its whistle, and you hear a tonb0r( 3:rpqr gne 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. Assunq s-3;ux3w,y7 rtv lome the speed of sound in air is 340 m/s. What is the frequency heard by an obsluw3n o3ts ryvx 7q,;-erver 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 2r:u0.0j cdo o63zb camy b(3hiqi:y oof sound in air is 340 m/s. What is the frequency hearrqjcu3b z(y0. 3 y::bi m2da60iooochd 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 determine the speed of an object. A 40-kHz signal is l wm+)1ku 5ykmkcc3 w8sent out, and a 42-kHz signal is returned. Assume 83u)ckcy+k5lw1kmm wthe 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 produced by a5 /8qom.m8cn7kf2xp e4pdhtz eqa 41z 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 half-akus6 ,v:)esqn ngle of the conical shock waveq,u es6v:ksn) 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 jobd wc) z:b(ix/e68caji/ d,the United States to Europe with a Mach number of 1.05 where the air temperature c/wx / jbce,i zo8jd():id6abis $5.0 \; ^{\circ}C$. What is the speed of the plane?

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