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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: 游客未登录  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 statemen3xp pev ;,lm)mt?

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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 fasb0bt4;2( inn jvxrd1y test 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 rod: vedijt .g8u,g2g (tz3wn+oq?

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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, wha3g1pw0t43c)6zipzm mg qwr ,n t happens to the velocity of sound? (Assume th gmi6gzpw3nzq4c 1mtp w03) ,rat 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 throc tpu*pnh1k o5z*m3i w*1is-d ugh*n1pc*wdikz p*1uth s5iom -3 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 40. u.l(bkzd 4ui0 Hz sound, the wavelength of a 200 Hz sound in air bk z.4(ud .luiis

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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 gyq+xt.b(oy8 oreater 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 with frequency less than 20 Hz arh3vzpub2o9 s+ e 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 uniform:zmpwe-n i( b,ly in all directions. If yop:ib-w z ,mn(eu 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, intensity is propor-8j wpsosa1r (tional 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 )/lwqqha,k8d d from the source is I. What is the intensity k)awh,8q qd/ lat a 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 9fie99hk ef)+*fr- fj xnp)gr is radiating equally in all directions. What happens to thegff pef) +ikfx j 9*rn-r)he99 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 8iqhp1)+jwt*.)ns run eob9x is radiating equally in all directions. What happenb1 t*)ns9jwie +pnrhou8)q .xs to 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 increas 1prug9a9xk .les 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 pur0vm yaev+7l 5:/cdn emyk 0b3(z og0dze tone. What characteristic of the sound zz 0e3mc:vy lva/mg0d5b(k7o0e dn+yincreases?

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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 ,jp 6*-m2 qvm*pkomqh 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" o+yo bt 33kivq/f 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 water od0v4n-ux3h vqr y67y

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19#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Pressure and displacement ww,pym ztlk2d g. l927 uwy8z3xaves 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 .to9 x9qw ,mi*;u:c9fx-zd s+ jly kwdwave on a guitar string and the sound wave generated by the guitar as a result of this vibration. Whatdi-wjuosq,9z9f:.y xd k9m+;cwx lt* 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 y1r1m: /z)kqluva8 n vopen 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. Whaxkx ntkha52.s 5b r00bt are the wavelengths of the three lowest tones produced by th2ks5 00t a bnrxxh.k5bis 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 j+k (rs 1cgk:iopen pipe of length L is 200 Hz. Which one of the following frequec+jk(igk1s : rncies 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 L91w rfcvzk8p2z22 0cu4isa xk is resonating at its fundamental frequency. Which statement is correctwvcps94k i0r 2ucxk2 21zz8fa?

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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 op kxlh+ucn5 +45x/ t:efwu4h9dv pcfo .en 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 rt-itc7 7fyqo,-ca3g s5a.wbthree lowestc -boa.ctyqt 7 5srw7,agif 3- 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 closed pipe of l*g 7 vm0-xb;lhw7qr qeength L is 200 Hz. Which of the following frequencies will not resonate in that pi 7x0lh;qvr 7web g-m*qpe?

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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 ,v weo/w(yiv; fundamental frequency. Which stateviw/ oeyvw,( ;ment 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 b8jy 1rv0pamz0c 16kzby the same source. Each speaker producesr0y m vpkbja 0c6181zz 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 waves should hajlungwt x+i6dv t94hj,8- sl: ve

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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 aw j5sg12ouqa 72pa r)together and a particular beat frequency is heard. Whatr2 1apq7jag2s) o5 wau happens to the beat frequency 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 exp8y bvdv7;du 15mwj di y,.xfv3xaxl65lains

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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 obsbsk*ndd ux -06hag 96b0 u9sxk*b gn6 bhadd6-erver 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 herau l6 0e86pm ks;yvr*ard by the observe 0*lr;maue6 sk8ypr v6r 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 decree0 6 capf4;2mhr nct1base by a factor e;n ch21br64acp mft0 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 kHzw c:gv1o(4jkbfiu5fnl +7kc ( in air is 352 m/s. What is 15:ioj( ku vlccg7wb(4fnf k+the air 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 speed of sound in air atbjuj ab 7)3p/s0yog/q $0 \; ^{\circ}C$ 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 who6i8g(b9pcwa ose echo reaches it 0.0250 s later. How far away was the object gcw6(8pibo 9 athat 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,vt 2b 0d4zi;n qq5il;a f)pcd) and hear the 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 aftev - )zt,qk0bsmr seeing a flash of lightning, the distance to the lightning s0zkqsv,- t b)mtrike 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 day the texacf *dnv 0;5kxn7(ju 6g-a/ amhbly+mperature 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. Ho4 tgj9e;ks*9l g6qdp6b c qqzi/v f9e4w deep is the well? (Ignore air resistance, and a9c s;9qpkz4 *49jfd6/t6gq bqgelivessume 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 ep962k6pqx9,0 lmqg nulw6 yn 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 a oead(3 /3kdv) cgnwxu 8o4g8nir 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 level of a sound with inte g; t0-mz dlmq;a1 1ws9f/ghczetbk9,nsity $10^{-3} \; W/m^{2}$?

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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 sound9b 5 3r0tn hvrpmld0- f(.pfvc?

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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 inte vv g9.q9lve.tnsity levels of 70 dB and .ge.9v 9lvqtv 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 engin nw5+7kasyg9og4z a+tsv 5 5yyes in a garage is 100 dB. What is the intensity level generated by one e7vy 9+ot4wags +zgyny5 aks5 5ngine?

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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 dghbnlch d +b3 u2ok7wvps8 /6 9ywu59in all directions ics7bo 2ly8g u9bv h9 wd5nkpu+w/3dh6s
$6.0 \times 10^{-10} \; W/m^{2}$. 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 ramo/b k u,ws ssts ;zv,/pgo-)*diating equally in all dirksms-/o p uwts,o/,vb);zs *g 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, whi pn6 7du36hdzmw 0ealo,n9lk/ch is assumed to be uniformly distrlowu6 emdkhp 37 d/l90nza6, nibuted in all directions. What is the intensity level 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 5.00 m from a barking gvur -pk0 ety a),fyyx l /hu5bv1a3+(dog. What would be the intensity level if two i5 t0vva a/luf )(1kxeb u+ ygp,y-h3yrdentical 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 inwu f4 ,tq*1/cim7gvm from a sound source the intensity level is 60 dB. What is the intensity level (in dB) at a point 2.0 m from the sou7ifg ui4, mt/nqw1 vc*rce? 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 sot(k,; 6hze; zg0wxzmk urce is 95 dB. At what distance will gz;kzhk0;(me xw,z t6 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 ah;drmuti 1 x6g-a40c frequency of 1200 Hz. What is the fratm4u0dxg 6a -i1;chrequency 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 op2kf67mfjb/ ixen pipe is 900 Hz. What is the length of the pipe7xmb2 kf/f j6i?

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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 pihbq l3de, y io6e/k,o)pe of length L is 400 Hz. What is the frequency of the lowest tone that will resonate in an open pipe ofod, )hyk3bi e,o6 eql/ 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 velocity of spy.cb7l7vfr 6wxtav(i h76d 7ound in air is 340 m/s, w77cxv (6b67hrp7il f w.vdyathat 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 temperatedz jv/;7m or)j/b6vj+zx +pjure 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 onexzm;gap, uj2o,/yv hn2c0hp/ end is 330 Hz. What is the freqhp,vcm0jza;x/ 2h,pn o2/g uy uency 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 shc)q2 5d1inc kp;2/qr3sv, vuab4dq mcortest pipe closed on one end that will have a fundamental frequency of 60 Hz on a day when the velocid22 p1m ;)5a,iq3cukvv / 4qrcqdbncsty 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 roo ,:6oywul+n l+yqg; gvm 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 inkh :kv .qe dg,yef0h/pez5- e,+4gtp g 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 ndcg2a.4 x/o wj/cd5 a+a5 jbbof sound in air is5/ajj+o xdna2.4dbwc ac b/5g 340 m/s. What is 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 of the same ld;ah2 acy1)ct85 f famength: 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 of the closed p8)dcm1f ;ah2ca5af tyipe?

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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 ve3a:ttv.zfmb8i t 2+v yov7 6azlocity of sound is 340 m/s. How much farther back would source 1 have to befatomaz b3+.:tv2v6vi 78zty 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 driven by 6k2(t9s -nszzlyu4 t y,fbu3vthe 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 is 349utsykzl 6b 23z(tvyfu,- 4ns0 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. s n-9ybo20w02tmac di 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 frequency of a (e:(h ;fvwc/fac b;8s qh9 uvpmusical instrument. If the tuner hears a beat frequencwc 8f ap;us(e fh;q v/c:vbh9(y 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 thee h(kn9czhp6qd4;3 , o34ygw4n, j*mck ifdx h sounds produced by two horns are 6 m and 7 m respectively. What byw qd;fe4cjn4m g xo3*9( k,cz43hp,k6ndhiheat frequency 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 orchestra are f:xzt/ dorc(m 3ound to produce a beat frequency of 2 Hz when a frequency of 660 Hz is played. What percexr zom( t/:cd3ntage 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 speu4 o go7xb ,rw;uim2v/ l/lcc;ed of sound. The observer hears/ lmc;uu;i xg2 7r/obw,lc4ov 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 stationary o(i fnjgudq8 +0 h(4x+vft pdw5bserver at one-half the speed of sound. The observer hears a frequen x84ugnph5ddwjt+f( if0v+q( cy 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 wit ;kyh4u5,- nmvoslag4 h a speed of 30 m/s away from the source, what is the frequency heard by the observer? l 4k;v-uynm45asog h, (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-pn2c 2gyq;(w nHz siren. 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 dog;cnwpqn2y( 2 es 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 bo.4n s:ujfm jsi-ew- a/eb:;wy a stationary observer when a train approaches with a speed of 30 m/s. The frequency of the train horn is 600 Hz and the speed of soue-/s;mnfwa .:jio-u 4:bejws nd 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 tb;i9l )zqk7b/khm- ca oward you at 120 km/h. The train blows its 400-Hz whistle. /;kzmhlbb) i-ca7 q9k Take 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 statiil 8matk0dgh704bcin1+ r s: monary train. The train blows its 400-Hz whistle. Ti mh kst:a+rmln gbdic04178 0ake the 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. x7evg8w.qhm 8w;,s ql The train blows its 400-Hz whistle. Take the speed of sound to be 340 m/s. What frequency do yoqw8,h qvx7s e 8;mwl.gu 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 kmd jnz ,7k2m8cp/h. It blows its whistle, and you hear a tone of 400 Hz. Take the speed of sound kznd 27m 8p,jcto 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 5006t5pp x)mjn6b Hz. Assume the speed of sound in air is 340 m/s. Wpp6tmx )j5b6nhat 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 is 500 Hz. Assume thy nx0n. fma4-fe speed of sound in air is 340 m/s. What is the frequency heard by an observer if the observer is approaching the ynf0-mnf4 x. atrain 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 o v ; -/s* wiiwfqs5a;llq+1owrbject. A 40-kHz signal is sent out, and a 42-kHz signal is returned. Ass1;5or-w+/laqiw s q*;l vwfisume the 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 aljy *h6vldy 8.5/ paqv 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 Mac l,:zv4 o lreoe86nas-h 1.4. What is the half-angle of the conical shock wave fn 6e:e4lv8ao,o lzsr-ormed?

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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 numbe7ccwdfo )i+x+ r 5t0nir of 1.05 where thnxrfcd+75)io w 0c+it e air temperature is $5.0 \; ^{\circ}C$. What is the speed of the plane?

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