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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 kw *ve.nk7gcc d)ye l.y6l(za 5,gu*a 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 fastesscw-fygc 7z /,t 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 t-e -2 rsvy1-vzq1obd?

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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 in 7vk4qlmv8t,z yy)+vl77lufx creases, what happens to the velocity of sound? (Assume that all 8yv7 7lxl ,4um)t7lv vzfykq +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 zhakvnh)ep ndz9r+bz igbm;+5m/r z/ 2sj ,91Hz sound through +9a)evbhz5nz+ z9sj /d12grbk/ r;pzm ,ni mh 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 2048eytk-ek) vw6n (z x/m(;ycw, rceba 0 Hz sound itykk; nze)xweyva- ,c(b m8 we/( 6rc4n 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 206p:vhe ye8mhou c5)8ein/:.r/pzn ez,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 are ca2:sf 7 x iltoh56fw8h.lu91-elsw3ttqr9 fyilled

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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 a o8ae;ydg5.vlll directions. If you move to a point twice as far away from the soev.ylog;8a d5urce, 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, intens6a5pbhx;4:k3qn na -oo beqf0ity 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 z08o f5hsb y.;nwxkj. at a distance d from the source is I. What is the intensity at a dista8k zoxjy.. 5;nwsh0b fnce 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 ap4g yt 5,qw5triuk.)r sound source that is radiating equally in all directions. What happr)w5tui5y g,. k4t rqpens to the 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 radiatinua mabn,9i5)ig equally in all direct a)m9,u iba5inions. What happens 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 increases as a sound becomes dvzkjo4ccl)l+5 dl -. 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 speakerliw;-mfkvkihe qlo6 t -zb(r8--/ke; emitting a pure tone. What characteristic of the sound incre-k;(;-likw8-zq6t vr eof-b e l mkih/ases?

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16#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What determines "loudness" tyh6hw4*ci i6 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 "pitchga6 )rgkn 7 *ktq2w:kh" 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 6vy:4g qkp82 gym3ro pair 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 waves a:z+ gig85smuy6 *s fzire

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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 ww vkl*q8a0 e6tave generated by the guitar as a result of this vibration. What do these two waves ha v *et08wq6klave 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 xz4,ds zl6p/lt.v 2vaboth 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.8:pc xhp/ietv7/6 um9ys rf8 f What are the wavelengths of the three lowest tones produced bsp6/i/t :r9efy8f c8x m7hvpuy 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 ,( gw8i, atdw6(ipg pupipe of length L is 200 Hz. Which one of the following frequencies will not resonate in t ,g w8iud,atiw6pp(g (he 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 ) yz w7s5f5ztiat its fundamental frequency. Which stat5) z7s5zwi tyfement is 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 close53, yl.s2- av mzvmbjud 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 wavelvc;i(kr -01xyh -mu 6jxrcq4 aengths of the three lowest tones produced by this pipe?(- am6x kq jx0 ry-viur1cc;4h

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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 cl7rc) v bwxp(5sq9.sbv 215ov ,4)dhvzloxbzsosed pipe of length L is 200 Hz. Which of the following frequzwbs)rv)7vb bhq,l9vo4. szc5v2x o( p1x5sdencies 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 its fundamental frequenyvy:ilz7l8/fo ,ks :ovoty ;*zs9f6 acy. Which statfv6za ol 7szv*syl o yt,8y:f9k i/o;:ement 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 saus + trqnbmq++ )jat0tim-2j4me source. Each speaker produces a tone with a frequency of 200 +tr+sutj2 j-0 4)+ibnam tqmqHz 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 w-d2ih .f s:t o,oo+lpeaves 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 beat frequency c w1i,p ei-2ypis heard. Wha2 -iwi1 pep,cyt 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 explain6l hk7)hmq zhh4d+onucoz3*+s

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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 ob((lw,e(6r mh a/ihmq bserver islm,(/h a6ihe(rmwbq (

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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 sta:zkqrx: (las3agmdck5r g ( 5:tionary observer. The frequency heard by the observd:(c sg(55r:k r3aalx: z kgmqer 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 de5wlvn3nng +h fl n73n(crease by a factor nln(wn7fgh3 nn+l5 3 vof:

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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. Wha-,4;qr1d,smq br mdu at is the air,d1,;q4 r b-msurm dqa 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 p:b4v/8i:b uz 1vfsdu 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 is 340 m/s, a bat ebu .n*8:py ekmxy/r+e 6vbw1l:un;dn mits a shriek whose echo reaches it 0.0250 s later. wrnybn:e/emuly1vx k*+n8.:bd p;6uHow 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.gx+ z:x1zkq3m00 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 flash oso:ry komlgr-o:oy00 vxe;hv-;3 vn2 f lightning, the distance to the lightning strios m-lry : yov; 32:x0h;grvnoe-k0voke 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 temperature is pyuby59i6b va6a m0t3$15 \; ^{\circ}C$. 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 j a n*f(0qwl .-n-oz+ewjw+ xldeep well and hear the splash 2.5 s later. How deep is the well? (Ignorea0+ xn-l zfjeww -w+o(l .nqj* 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 soune.68kc-y ckbh6fbe 3jd 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*totedv2+ zl76p+ao gir 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 sou(sm gc 5icxk +cjgl-5av +f8t)nd 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 intensity3nrtp9krhwvp86 oaj 3+ s/sg4 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 s 7ya)o1b,2;ufomw ty-j+m m qoounds with intensity levels of 70 dB and 40 dB-jmu mmoob,7+fy1; taoq) w2 y?

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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 iy.x2*zsx1 p r.u1pmias 100 dB. What is the intensity leve z1xmaxs 2iy.p p*.1rul 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 ofs(bu +8lxw+fi 6.0 m from a source that is radiating equally in all (++bx il8sfwu 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 6.0 m from a source that ia8:rn e au7iq5s radiating equally in all diruq 7ai:e 5ran8ections 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 assumedcs0g8g qn: wq4 to be uniformly distributed in all:w cq0s4 ng8gq 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 dq ej2bs33wvh5tgs ,(d :y/ayfog. What would be the intensity level if two ,s/ yj qwth:5yae3gd (2fvbs3identical 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 j o,fvzyr ,pe7h)f6 0kintensity level is 60 dB. What is the intensity lz jvrf0ey fk) 6ph,7o,evel (in dB) 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 95av8 *dc78l;vwpwan n4 dB. At what distance will it be 75 dB?w;l4p v8*nw dcnav8 a7

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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:gd1 7 x+ukzw rwdt5o: of 1200 Hz. What is the frrk 5:gw+o7 :w tzu1xddequency 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 9003 zape0xw7 8j)qycc:z Hz. What is the length of thqewxyz j7 0z:)cpc8a 3e 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 resonate1 ulq mit,lbcfe06z9) in an open pipe of length L is 400 Hz. What is the frequency of the lowest tb9tmu 0 lzfcl)61, eqione that will resonate 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 at bot atvx,i wox9e0m5gx;fh8rgw-6l 5 bp.q7 u.tkh 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 seco.euawtt w68m 7gvlb05gqxp;h if9k .- ,xrxo5nd 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 temx4s(zuqwt sj/ 5 etyx+:1s(fuperature 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 one end is 330 Hz. What isgm1soyl* 9k8p the frequency of the thi oy1m98gkl* psrd 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 closed on one e4 s jwbo9z81;oqqn/*:oawxtl nd that will have a fundamental frequency of 60 Hz on a day when the velocity of sound is 340 m/oax 9lq j8sb4onzot* w;q/w1: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 tempera64nnj x (5crcuture 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 wherezd6gir 3 -x4 y,qlmkq+ 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 b7rha5 d x6.t r2*bishof length 0.75 m is played when the speed of sound in air is 340 m/s. What is the fundamental fi xrsr2dt5*a6b . b7hhrequency?

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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 le 2:. zaf() 1xq7r-*n.tx tvwftitstakngth: one is open and the other is closed on one end. If the fundamental frequency of the open pipe is 300 Hz, tt1trx.vf i q2t7k fw ztx(-:.na)a*swhat 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 tc*q o g;os 5zl/xn1me)he velocity of sound is 340 m/s. How much farther back mo*gl5s)qc1ze;/ x on would 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 driven by the same fredh.efsy. zpfx56 3xj *quency of 500 Hz. If s3.6y.5z hjdf*pfxx ethe 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 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 frequencig, t 5tr,0trsbes of 440 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 to tune thpu(c-vg4e m( 7a nwk5oe frequency of a musical instrument. If the tuner hears a beat frequency of 2 Hz, what is the frequency of kwv(oan5e7m c4 (p-gu 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 proea agu (m3v1mnf )0e;nduced by two horns are 6 m and 7 m respectively. What beat frequency is heard when the hornnem3f1 0 e m)uag;va(ns 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 found to pro .sh1:/wdfkio duce 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 so.: k/hf iws1dame 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 sta,l9fy mj 3ab*ntionary 1000-Hz sound source at twice the speed of sound. The observer hea ,nj bfmyl*39ars 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) appb iab:wgtj)4n 2 r:l /hlna+s*roaches a stationary observer at one-half the speed of sound. Theananwjlb lh4*+ g/ sb 2:ti):r 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 speed of9 .mjjc *stja 3y8h2rdu h9b28t)clav 30 m/s away from the source, what is the frequency heard bc8ajd998v)bsyh22j h3at rcu lmt.*jy 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 e 7e*k .-dml2myx5kbztraveling 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 ey.*m x k md7lz-e2kb5the 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 stationaryf0edyc bzqvy+.j;6h t8eb( 9 w observer when a train approaches with a speed of 30 m/s. The frequency of the train horn is 600 Hz and +jebhc 08;edt fyz y9.6qbv w(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 bl2;do:-gy sa veows its 400-Hz whistle. Take the spes;voye:a-g2d ed 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 tra4 rvre 5hbhh:;rc21ygin blows its 400-Hz whistle. Take the speed of sound to be 340 m/s. What frequency do you he 1 h;gb5vhre4:r hy2crar?

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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 its 4q8m.feti/kz.f *;dnk*mt) m c00-Hz whistle. Take the speed of sound to be 340 m/s. What frequencyt fc)kkd. m;m*mz/in.eqft *8 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 blows ohe, (hlsm+p;its whistle, and you hear a tone of 400 Hz. T;sehm( o h+l,pake 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 spee .)9sx, m 1knzi-bay+au/ d riazj6so(d of sound in air is 340 m/s. What is the frequency heard by an 9-.,/r()d6y +iso ziab 1jnma kxuaszobserver 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. Assui.cx3 /ykeq 6agu6 9yqme the speed of sound in air is 340 m/s. What ise6.a yx6 qkygu3/ic9q the frequency heard 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 ob ye 0z ro-txxh u4u2mzq5 1w7w)b/sjh)ject. A 40-kHz signal is sent out, and a 42-kHz signal is returnerhj1e4-qbyhxw0 u 5) z w/u)o2tz sxm7d. Assume 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 sho( *qff9tit2fc hhy3a0ck wave produced by a 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-0v,n1dmda6 ju w.-eh5cjbs e -angle of the conical shock wavenwd5-ehj1vsajmdbe 6,.u c0 - 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 l,fvz/vb qf)d r -,mum t4g*+fa Mach number omvfg,q4+*bfrt l u/z -)dv,f mf 1.05 where the air temperature is $5.0 \; ^{\circ}C$. What is the speed of the plane?

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