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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 f;/4x vp ehne t4pg4y(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 fast1bh 2y)f; ictjz.q8u uc vin34est 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 vbw2v/ aa f(+jrod?

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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 veloc) +odketcj* f1ity of sound? (Assume thatc1ofk)+e tj*d 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 soutrs,p ;xjtd-4ytt 1ne), j 6fand througxy 6t a4jrs,tndp1fjt;) -,e th 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 a 200 Hsw,(cv ;df ,xtwyx4+ixeq01yz sound it+d x0cvqfs ;e 1y(xy,4iww x,n 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 frequencies greater than 20,000 Hz are calli e)y4t1dr) 8i9g ergiuqw;)a ed

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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 yg 9u8/:tte)m6b xdvhquency 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 uniformly in all directio0lp4iu+s tv: ct51d irns. If you5lt1pd:t+uic0i 4 sr v 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, inteu-n3or u2ml mle 06et.2iysu+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 distance d from the source is I. 9q.tkzpth4 h4 What is the intensity at a dt. hz hk9p44tqistance 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 that is radiating equally i ;gkb iqsr0p2-n all directions. What happens to the intensity of the 2sr;-0 gipqbk 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 sound0rn/tb h, b8ps source that is radiating equally in all directions. What happens , s8rp0b/tbhnto 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 asdk( (,z r/capd a sound 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 ep:1- vwml7w2dss sl- umitting a pure tone. What characteristic of the sound indm: 21 p--lusvs7wsw lcreases?

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16#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What determines "loudnessqp(9)r kz3p yh/ mmld3" 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 not 6ok/d e11jlghe?

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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 iperacf2r:ezd1 l 0 *7nnto 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 waves a- )ytk k z)btj4nbx9a-re

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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 x h v4w:*zk0od::a6vs20rnhi7sqfzrthe sound wave generated by the gu7zfd0kr62a4h:n0rw io xsh zqvs :v:*itar 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 open at both ea5s k- 4s1mx73mntmei: c9uw( vn ob;nnds, 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 6eg-i pt dwh,jj+ 8jxg6*yj )bhk 7)rfL. What are the wavelengths of the three lowest tox, j+dw)j* )f6-gb t8jik6hjehy7pg rnes 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 open pipe of length L is 200 Hz. Which one*+-jef va3x ss of the following frequencies will not refe3 x*sv+s- ajsonate 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 fundamfqrqnl k0h119ental frequency. Which statement is correct?0k1hr 1qfn l9q

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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 92 u43qbxdbqnw6 cc. iclosed 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 wavel f( rs-z6)wxntel.a 3sengths of the three lowest tones rt)lzfx a sn (3e.s6-wproduced 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 res( z-)s kn uev.p5kwn4nonate in a closed pipe of length L is 200 Hz. Which of the following5u(-v) kp n4ne .nszwk 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 a sjo2. izr5:yot its fundamental frequency. Which statement is corres.o zj:2riy5oct?

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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 tkl1-rov9xi ) * d,qizpbka-p5he same source. Each speaker produces a tone with a frequency of 200 Hz on a dz)x-v- 9p1kilqkp*b5air o,d ay 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, tnogp (m 9omq1:he two 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 together and a particulj-inamlu9wn:q7 r(ddc32 4 : hx3hkzfar beat frequency is heard. What happens to the beat fnhnzc 4ifjhr7wq3ad :x:2 d39ku l(-mrequency if 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 explainsj8z qz ncgr*(kjmd-*:kj 0 pc8

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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 heaz 4s y.udgf(frkf,0xsogbu(bzb9x47 c :6k d4rd by the observz 47 x46(f,: xbcrg0(. duffkug9zbb 4ydsskoer 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 p/z4kmzd,g(k+d yad xz3j+;9v gl:b z stationary observer. The frequency heard by the obg+x3ygdd4 + dz:,jk zb pzz 9l/v;(mkaserver 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 doubleclnskarxj6*)5zx,su/ x5l8 f r a 47ju w*e4ve its MACH-speed, its half-angle will decrease by a ff7/j * s ,)clr4 kjw6u lxuvneza84exrsa5x *5actor 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. Wh+qw.1t 7:teyfzjn bl 1at is the air tempertle: wbzyq11.nf j7t+ature?

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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 atf p( faasf36ieno a0gedm4p5a2en-b0; j* e-s $0 \; ^{\circ}C$ 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/ry:n p vvyio0uyw.9o c248js air is 340 m/s, a bat emits a shriek whose echo reaches it 0.0250 s later. How far away was the objero2p :/ o8i9y4cjyuv0nyvw s.ct 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 + xjarhexsk7 gixv y,+)0bl6;c))a gds. 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 .gdn9i xo+fu9to the 9g+x .nu fdi9olightning strike 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 cliff on a itq qg-hv02aroz w *(pfp.j.- 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 later. How deep is;x/tu 065dg*o5wsor .r mmr hn the well? nxmtrr.5o0h;56gsw *uod / r m(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 frequency 500 H zv(f3mc susmy*;1lv8 z 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 at5q df *nai/,ywe7xpu .gdlnejj8-o -- $23 \; ^{\circ}C$ 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 oi g0rznb fca)b2k3;1z f 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 /0e: oe3fk;k 1dzb+x4ujplsh 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 intensity levehxs rg,1 r7ir/ls of 70 d,7xrhrr g1/si B 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 p;z + syek.pm/intensity level generated by op/p+. zk; mysene 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 radiating equally in wwj/5f798 nnxzay 2fwall82/awnfy7 xj5wn fw9z 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 e1fjys ) t+8:pqbeg:u 6.0 m from a source that is radiating equally in all+ 8gbe) qj:u tf:ys1ep directions 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 - 1vx/enc4r8 /pf kkqbn 1t.ovis assumed to be uniformly distributed in all directions. What is the intensity f4n/ 1v1nkx/c8 p eoqr. tvb-klevel 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 dBfk6,c zyxxv 3.;giyr y3.z(ra at a distance 5.00 m from a barking dog. What would be the intensity level if two identical dogs very .y k;xiz(y g6y3frc 3.xvr ,azclose 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 dBo,uf xj ctg6,yg*j4t9e) x i1s. What is the intensity level (in te9,g) ,fy g1is4*c6xxo ut jjdB) at a 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 5.0 m from a point source is 95 dB. At whu3by( j cc4ic-at distance will it be 75 cj- 4yb3iucc( 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 com:;3lnie 6tkf8gyyz )vplex tone has a frequency of 1200 Hz. What is the frequency of the fourt vt ;iln3fky8g:zy )e6h 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 xhpv*re4k+ s 35tzsh 0is 900 Hz. What is the length of the 3vshxht4 ezs +kr5p*0 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 resonate65d- s *yqyb3fr7ww ps(y wa)w in an open pipe of length L is 400 Hz. What is the frequency of the lowest tone that will resonate in an open pipe of abwpdy wy6rw ss7)yw-(*3q5f 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 enda l yieqgj414-s has a length of 0.80 m. If the velocity of sound in air ij l q4y4egia-1s 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 the temperatrtp-;,p hu.ewt 5:y xlure 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 ac3c1 59ai3osm oreh:4sm, e 6 nscatf;t one end is 330 Hz. What is the frequency of the third5,9c ocnif 3ams e1essc;:o6rmt 3ha 4 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 tb0or) sto nb t)/z,nc2udw/ea )*y.u shortest pipe closed on one end that will have a fundamental frequency of 60 Hz on a d2n so0)dub otrnab/, /y) et)c*.twz uay 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 wheresl/y 6yqkrz82hs/l 8 n02hrdr 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 .u0hsw /qww0oca1 ps1 in 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 jqcq(,l)7nf gg+pch (speed of sound in air is 340 m/s. What is the fundamental frequcc )q n,(hf (gl+qgpj7ency?

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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 ot;wf1k x +yb,xxtgzzhat//6m kv me*98her is closed on one end. If the fundamental frequency of the open pip* 9z x86/wyat+z;g1fb e,mth mxvxkk/e 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 thel) nrlz, 2qdy5 velocity of sound is 340 m/s. How much farther back would source 1 have to be moved 5l,ny qr)zdl2 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 si+98 ne fbchae b0y(d3pde by side and driven by the same frequency of 500 Hz. If the distance from a person to one speaker is 5.00 m and the person detects lihb ce0 pn+a8yd f39e(bttle 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 the beat zhgp5;.oj +tbkfk;v4frequency?

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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 tu:b9v+)rhqn clmhfd 0 3ne the frequency of a musical instrument. If the tuner hears a beat frequency of 2 Hz, what is the frequency of the instrument?qb)+ vn3hm: l9 d0rhfc

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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 6j*v ozwq8)ci5 m and 7 m respectively. What beat frequency is heard when the horns are sounded on a day when the velocity of sou5z*w8q io)v jcnd 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 twoh3c3kx1/ga9,n/mame 3c uzg2md/ zm q 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 brin3d/3 az 19mgc,k/cemm3 qua/xhm 2gnzg 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 kwuh,, /*3bdi:tgah:zv + khbstationary 1000-Hz sound source at twice the speed of sound. The observer hears a frequency bb 3 /h+ik,h*duvk twg:,hza: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 f :)hbk izp16y:05sfe rpgb (dlrequency of 1000 Hz) approaches a stationary observer at one-half the speed of sound. The observer hearedif( h )61k5zbbpg0:sy: lpr s 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 7z/ 06x.tfkqbo7v;c sg xh9fca listener moves with a speed of 30 m/s away from the source, what is the f7f6x 7czv;/ gosfcxkbqt9 .0h requency 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 35s ),th u..f uxpwh)ip: 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 roads f :.s .piux),tw)hhpuide. 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 wher y af79kc+gjc5:w 2cgn a train approaches with a speed of 307 +cfwrjgkyc 9acg2:5 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 traveling toward you at 120 km/h. The train blov5v rox-py7 u-ws its 400-Hz whistle. Take the speed of sound to be 340vupxv 7r-oy5- 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 zb,. +vb1fxl o),b hmqstationary train. The train blows its 400-Hz whistle. Take the speed of sound to be 340bo ),vhx m f,.q1bl+bz 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 120q*tv4qu0-;ur p hk,dh km/h. The train blows its 400-Hz whistle.-4*dkvqhp ,r u ;tquh0 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 awaetl4v/uy3y85f 3q axst ;.f wky from you at 120 km/h. It blows its whistle, and you hear a tone of 400 Hz. Tak4v qk3/x8s5u;ff3wty a.el ty e 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. sc03p.r4 cs3h -psn9 i nhmv7lq,q+n rAssume the speed of sound in air is 340 m/s. What is the frequency heard by an observer i0c3l rnrcnp,sqv h-9 3 ms7. 4+iqshnpf 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 tc3m qd,wryt32b-cx zo3kye;9he speed of sound in air is 340 m/s. What is the frequency heard by an observer if the y3-, by;cwok 23tqzxrm3c9edobserver 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 pe56 2 r54c+:isc :biqaymbbwspeed 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 th 64:a+:2bq w5bseciypi r b5cme 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 supy;wfkc w1)dlx3.64orbdtmpo.vos2 /ersonic 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-angley+ 2hu7pe1(iz jjwo/fp7gci * of the conical shock wave2 h */+ji7op pui(7cwy1ejgzf 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 a Mach numbep76zo3kf .qnzy,/ c0qqek d a:r of 1.05 where the air temperypn,q a:docz/60.z k qfk37eqature is $5.0 \; ^{\circ}C$. What is the speed of the plane?

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