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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 false statebrx3w cf1zg4uk) a-wvkq 3 (4qment?

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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 fasxfp y ,d+xkfk*j,5dou :n9q3t2og2 sutest 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 steel7o0wa x.vz wu;a(4iczs4i m3ww7 l0go 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 sy88ax) 3:ipr3pj grfuound? (Assume that all other factors remai8rfu38gx)ap rj :3ypin 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 d)(u7 8qtmxey Hz sound through air 8x y7(dq )utmeis

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6#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Compared to the wavelenulvz0y f6p o6*gth of a 400 Hz sound, the wavelength of a 200 Hz sound in a*op6ful v06yz ir 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 thajcfd6ay (4 ge-n 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 frequency less than 20 Hz 3x x7+oi xr;zm/vbn3lare 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 directions 2jgs ga9ip i /cz9io+t,h:6) us0jpfu. If you move to a point twice as far awayg2 )j t p99/i0 aizu ui:sf,j6ogh+csp 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 wagvl;xh7d* bvk1/a* eqves, 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 dist5**0bk9piejbzn z b4 bance d from the source is I. What is the intensity at 40z*b9bkib*e5zjnb pa 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 source that is rneml)ueb t vy .+1-)gcadiating equally in all directions. What happens to tg u mbyv+cee)tl1)-.nhe 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 in all ukqhc4*ypa- od 8f5zi *1 z7fadirections. What happens to the intensity level oqz1h*8p5 o*c7fyf- k ua4di azf 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 followingyy,mf65l*/tse m n.jk increases as 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 emitting a pure tone. Whuyjfc67y2 06a,h;g e -gqzgeoat characteristic of the so haogefg6z0q-y ug e;,y67j c2und 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 krkzi3sm z7c*wg2g0ecxl5+ 2 ?

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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 musicu(j)q 2r4c rbjal 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 wkv: to1 -rwion4c9y7 air into 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 w 5q7od 0*qcd+ n40jgwgeo/htwaves 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 6 gp 7 wqb2(s2p. pqhfke6zx;migw: ,awave generated by the guitar as a result of this vibration. What do these twog ppzk.sbw g(fq q7m pa,h6i2wx2e :;6 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 ends, theref3dey.+sm n 8lleq*qi 3arz*(2hgo3y

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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 lc l6-wtot:xl+qm(; g yength L. What are the wavelengths of the three lowest tones produceo ;q+lxmt(t:-6ygw lcd 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 iak0zd;6w7cme81pv zgn an open pipe of length L is 200 Hz. Which one of the folloa7mvd 18pz;kzg cw 6e0wing 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 re)tospa(wb -zo5h ep d6x34l -isonating at its fundamental frequency. Which statement is corrzx(bp iao63et5lwh- d) 4 os-pect?

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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 onb orkm.5w xx 8h90i2kte 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 arelnw,tle gvqgn u1/*be l66s6nw3z f;, the wavelengths of the three lowest / sen ,n*bg g uqtnll6w6f3v,z6l1we;tones produced 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 resonate in a closer+7+1c )q+dbh jjjp-b1 wbestd pipe of length L is 200 Hz. Which of the following frequ+)tdbh w c-s71 1jpr++bebjjqencies 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 itsj ze53p+ .xhptwx0kp- fundamental frequency. Whwkhx0+z.-epp x35pt jich 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 speakers driven by the s4unxbb8 +:b lo f2q6v.ewe j+same source. Each speaker produces uf8vwe+ bsb2 be 46xo+.nl:qj a tone with a frequency of 200 Hz on a day 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 two sound wav ,5gsml muoycyfvcrw0)59 ) n2es 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 beal q *;nwtno0x2t frequency is heard. What happens to the beat frequency if the frequtqn;lo *nw0x 2ency 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 exprmj1+/cm ekzya7*yi )lains

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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 the ob6jq g+o,qyke4b5al5a serve6ab aeg5+5yjkqlo4, q r 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. The frequency heard by tao54.-vhgfe l+v, uwn( u2 omee6+h qlhe obsero wge+f lq-4v 2nuvhme5h e o,6lu(a+.ver 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 decreaseeg6:m7.kr kav by a fact6mg7are k.kv :or 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 45iu u8vk2luoqrn1(+ph+2q 8si kHz in air is 352 m/s. What is the air temphk8 2su(1 vlqupio28 i+u+nrqerature?

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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 aii+/wwn8g 2eopdu v,v7r 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/s, a ba y -ju-rdny6z0t emits a shriek whose echo reaches it 0-6 dyr z-0njuy.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 the echo in 4.00 s. The temperature /g7tfm1jt35 y+oby vz7rqy :fis $0 \; ^{\circ}C$. 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 seeinjh94 ) *c8 3y:uir4iirmwzcuzg a flash of lightning, the distance to the lightning strike is c8u:z44c 3ir *rmw)iu 9hiy zjabout

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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 temperakfmqxo:t-es/9 b;. 9lsre el 6ture 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 intz 3.f3/tb vzkno a deep well and hear the splash 2.5 s later. How deep is the well? (Ignore air re3 vz3 fk/ntz.bsistance, 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 fr/w6qrh /rse4 e/mkif-v/3zf dequency 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 atm*:i: 8ky qq u2n:/gvufi 3uh tpxi5m* $23 \; ^{\circ}C$ 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 wit2zs lw5(o zrv 45idc61 v+c6xbgzqbr2di..n dh 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 ea..w)ml. k7rh2dv2/zhpa su of 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 with inten7/ pul4 :grm9f f /buc0oc2yczsity levels of 70 dB and 4 2b gr/fzu79 ul4/ 0ypfccmo:c0 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 thx50 sd a9a tjfi-++lxu5(tpwm e intensity lea9pwl x0ju++itxtd ms55-( fa vel 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 from a source that is radiating equally ikb f-gun+dgen8uz- .l:3 ( afvn alk 8f+(ave- 3 ugz:nu.f ld-ngbl 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 dakxe /no.9 +cmistance of 6.0 m from a source that is radiating equally in all directions ik9 cx+ma /.neos
$6.0 \times 10^{-10} \; W/m^{2}$. 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 assumed to be dm ,6uh bj/*g z.zyuj4uniformly distributed in all directions. What is the intensity le mu j 6uh.4yj,gb*zz/dvel 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 5.00j/w 6kr 44ebs:z0fukfw oe 1c6 m from a barking dog. What would be the intensity level if two identical dogs very close to each other are bark fuwck/zrsw4:jeefb 660 1o4 king?

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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 i sp fqwyh.j/5f/m .li,s 60 dB. What is the intensity level (in .hm ,fwi//l ypsq .fj5dB) 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 9(c (nmjj45mbzsm 4 c wp6-d8xhivp6p4 5 dB. At what distance w8hcm4d -mzpvm46p4(b js5jn6i(w px cill 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 has a frequency of 27+1 cplrc8 x n/epwip1200 Hz. What is the frequenp p8pr2+w1xn7 i clce/cy 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 lel1m eb g,+7 (q1co-q8nirszxength +gq(1s7ceb o8 nelqz rmx1- ,iof 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 ope ,kg8+x2k sm5chbb rj(n pipe of length L is 400 Hz. What is the frequency of the lowest tone that will resonate in an open pipe of lejmxc(2kk ,8+s gb5rbhngth 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 velocity 7(a tux-b 6q2k2/2faswm2xrbsq3av gof sound in air is 340 m/s, avs2(/m 2 xga6 a t2sf72q3bx-ukwr bqwhat 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 dhr:vv 6 bd32thc5gsr k 8t75pa room 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 on gxbo.7ril+ k-e end is 330 Hz. What is the frequencgk-o7 . bi+rlxy 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 thxtm xqn/- e.t/e shortest pipe closed on one end that will have a fundamental frequency of 60 Hz on/t qxe.xm/tn - 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 ix ey1k:2d:c wf8q3fnr-.knze s in a room where 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 in a room where tjygdq9c 0z*(( )m;vwqbi y*pxhe 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 plablqkveiz4)6zoa7vzqvhagmc+ h f 7008y,c 61 yed when the speed of sound in air is 340 m/s. What is the fundamental freqc faom civ+6l) yvaehgz0 48,z 776qhqvk b0z1uency?

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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 p4mvraa(21d2jw k /llother is closed on one end. If the fundamental frequency of the open pipe is 300 Hz, what is the fundamental frequency of tvmr 2jaw/1al ( kld42phe 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 freq x1q,bql un9.wuency of 800 Hz in air where the velocity of sound is 340 m/s. How much farther back would source 1 have to be moved so an observer in front of the sourcesl, b.u9qw1nqx 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 freque m;9dohg; r*lfncy 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 spe;;d *h frm9ogled 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 8o6ddrxw.de uoswlun ),3z0w** h3u x440 Hz 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 550-Hz tuning fork tkw)9z(s1;zu,ne z xql o tune the frequency of a musical instrument. If the tuner hears a beat freql 9u ;1xqz)sk(w nz,zeuency 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 sounds produced by two horns are 6 m and 7 m respectivelyu/gtuq15xki+f md: k 1. What beat fdu /xf1u k m1:q5g+tkirequency is 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 two violins in an orm( +cl( nmc9ybchestra are found to produce a beay+n mc(m(cb9lt 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 sound source at twice the spx isvy9qu1 ce pm85-/meed of sound. The observer x mi8v-qe9ps15cu /ym 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:zmka1-hrxvp4r3x;z(5 o n jh a stationary observer at one-half the speed of sound. x r14 3o;(hkh-rpaxnm5zvzj: 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 of 1000 Hz. If a listener moves with a sp weslza, jjorc 60-/5leed of 30 m/s away from the source, whatj l c5,0wsz/ eorl-ja6 is the frequency 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 sirj o5u 77exhks4 mzll9:ho6gn2en. It is traveling 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 frequency does the obsemnl6e9gus7 7 h42h zjlok:5x orver 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 byft+nhbu 1cq22 a stationary observer when a train approaches with a speed of 30 m/s. The frequ2t+cbnh 1 fq2uency 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 youwe g-dg6n542kwu;i3: nq gdiu at 120 km/h. The train blows its 400-Hz whistle. Take the speed of sound to be 340 m/s. What frequency do yoei;gnui 5wqdung: 46dk w23g-u 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 k8oy .c; 2sedfnm/h toward a stationary train. The train blows its 400-Hz whistle. Take the speed of sound to be 340 m/s. What fr82f e; ydsocn.equency 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 tra9du4l cjm7lpo89ojamk,q: k/ in blows its 400-Hz whistle. Take the speed of sound to be 340 m/s. 8apm9 o/qkc9jkdu:l4o,jlm 7 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 a, *qpesm84 wtug,pg4blows its whistle, and you hearg , sgwaq*u ,ptem4p48 a tone 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. Assume the speed of sound in air ivv,yslh:54h4:zua e k,b m4 q)m;ke sss 340 m/s. What is the frequency heard by an observer if the observe s4 v4:msba h,mlze:qku,);45e hy skvr 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 of sound in air is uo.42w9 ipgmn340 m/s. What is the frequency heard by an observer if the observer is approaching theiu mnp4 go92.w 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 deter6+r 4r 2mp- ha,lwyjnr-n;nq vmine 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. Hom ,;nrr wy6v n24 r-+apqjnl-hw 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 supersond)e l:,jzw4pf ic 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-angle * qrw;q cl :.8a4tlmmll jlv-oo88v1b of the conical shock wavlt*orob aw -8:j l; mc1l8vq.m48lqvle 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 flies2+ g3a ohkruyyi+ i99ba(ow)w from the United States to Europe with a Mach number of 1.05 where the a gh+ wy) akri oi9aw3boy2(9+uir temperature is $5.0 \; ^{\circ}C$. What is the speed of the plane?

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