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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 actn d 1l)col:, 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 throug-v3uluvl0adq zr89 c9h

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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 iz1n9cq yph-0 q58 zuejn a steel 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 hxr0n(9 *;lja .qaa.x / vygqsnb (qme+appens to the velocity of sound? (Assume that all othera .ybvmn+* s; xqq(.aq9g0 an/xl( jer 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 t) vs c*,i:hjf0ha0qpkhrough air ih :,skf 0j*aqhv0i pc)s

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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 Hz apa76+m un gxz.( cjv9sound inj.z6u9ac a( png7v mx+ 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 apnni/v.m +2f k fx,2kgre 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 Hzih +9oqqew5 swoo2vs/0 u6xa y;di4q6 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 sox)(fzo n ex+ 0xci3j/nurce is emitting waves uniformly in all directions. If you move to a point twice as far away from the source, the frequency of the sounz)ijx3 0+(ox ncxf /end 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 p-pgw4u 80tym.jpkd 9lro 62kx roportional 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 ii jwm.qnt+ *9-nd 4n7x3aym afrom the source is I. What is ty +7qm *i3. ixn4dnw-anmtja 9he intensity at 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 is radia- nrau9f8z0e ating equally in all directions. What happens to the in-f8az0 9 neruatensity 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 inbnu45dcg*/t* myan kd (k i(9f all directions. What happens to the intensity level of the sound? It drops*k/9bk(mf iy (g5*n au4ddct n 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 becomeur gmh )8ao88mrpz2k8 s 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. bvw2l*t( 9izf h,*y tkgri+ot:yb4y- What characteristic of the sou t (r2,h*+vi4bo 9fyz:tgwl-kyt* yi bnd increases?

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16#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What determines "loudne tdcs/ v7o6ke(ss" 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 musicha*xnas*t+ hg ifoabt7(3;3 c al 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 frocf0-)9kn-v dk bsjs t4m 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 whek wz7mk9xcc-2j 74+z2yxu t aves 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 wave generated nl7c7, n : edlfr4it7tby the guitar as a result of this vibration. What do these two waves hannd7t: f7ile7tr4 ,lc ve 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 bonqjm)jt,v68 u)j -a;i qz/cgqth 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 ofr*0agm/ gi8 3amtadd. length L. What are the wavelengths of the three lowest tones pmdaa/ agg8rmt. 3i*0 droduced 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 resonr-ghd n*(g0mvate in an open pipe of length L is 200 Hz. Which one of the following frequencies will not resonate in the mn*g(g hv- dr0same 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. Whi je 9agss7r 0yobqj9)jqv3wr-1,vnx ml06+o qch statement is corresa q)6qo0w 93 r yje7mjn ox vq9,0-+1sgbjvlrct?

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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 closed at the other, ther /6sri76zvsf uypz./tvm4: x,kj9z zte

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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 o8tryty1 abo4znx; .d6j/9b p df the three lowest tones produce4rxtaj d1zdyb8o; 9 t/.yn6bpd 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 length L is 200 Hz. Which of th6gb7zz q09ldh*dipus f 4 ffw06fi .*te following frequencies fiz0hzfq 70fwi . lp6db*4s6*9utg dfwill 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 7k -i exjj3vu4resonating at its fundamental frequency. Which statement is cori4ve-j jx 7k3urect?

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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 same source3j w;+ ;qi 29yhzgbt/nptb,zz . Each speaker produces a tone wtbg / wz;i+tj z3z29pnyhq;b,ith 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 haq:1d xbte vs2(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 together and a)+vk.f5w f95xiq3f1kgv rfummtj +8w particular beat frequency is heard. What happens to the beat frequencyur f wm8w35f qt gi1k+vv x+jkf9mf).5 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 expdadpy) *fbq8* 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 observekk6hhxd+.3)ashq p- sr. The frequency heard by the observe qpsa s3+x6khdhk.)h-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 fr-j+m)m/y9uhqx dndw *om a stationary observer. The frequency heard by the observer i/uwj)*d h x-+dqmm9ny s

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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 decrsq pg-cc98; nlease by a fs-9;8 lcp cqgnactor 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 frvfwvb5-.g )6docf6ffksp 90dl ea+j 0equency 45 kHz in air is 352 m/s. What is tho5+j c-0 wb9f p6v fakff egdsl6dv0.)e 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 speedc wbm6o0t 1 .zr/i4edm 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 is 340 m/s, a bat emits a shri 0q2mhegt o +/k/r8mteek whose echo reaches it 0.0250 s latg/t /2t8m ohremqk0e+ er. 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 4mj12k9h+oyymc8,adstj,lv 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 after seeing a flash of lightfwq*ikhy5o/sjean ) sg )to-tyn--- 3ning, the distance to the lightn- 3-ys5oe* -fsk)yt/ia t n )g-wnhjqoing 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 af2*naxs e75cl 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 z 2d/nji(;skjunw22 9 pii-gls later. How deep is the well? (Ignore air resistance, and assume the v( 22sijguw;ldpk jnn-i/9 2izelocity 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 ofmv ; ) 0cq/8( ;fs -v1n+bcrfdfudwmny 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 air a) sey wiis7 qhc ve0*gs/z:7n.t $23 \; ^{\circ}C$ 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 witro amgnr vky qkj5(/g* *45x8e tuc,j5h 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 intensityxrhuv0q7t:k9y1g 6 sq 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 intensity leto7 gw5n07i 2 c/k-yhpt:osqx vels of 70 dB and 40 dB? k np y ih7:2s5gc7xqt0w/-oto

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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*/ bzw rvx3tdim::si8 15 engines in a garage is 100 dB. What is the intensity level generated by one enginidb mr3 tz/*8x:ivs :we?

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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 frd + b78nd3g,fj w6psurom a source that is radiating equally in all directiw7b3gud8r j6, fndsp +ons 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 is radiativ:ca,t vco7/png equally in all directions / ,vcv7toac:p 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 s u*2oj7, sg*6.;gl ikstttpjof power, which is assumed to be uniformly distrib*7.kt; tg,j i g2ssuot*j6spluted 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 5.00xw;7, qjg +u-d3vmctn m from a barking dog. What would be the intensity level if two identical dogs very close to eu+m ct dxvjgwnq7-;3,ach 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)xgx9q yusw vh34v1; d a sound source the intensity level is 60 dB. What is the intensity level (in dB) at a point431y wsvxdq; 9u)gh xv 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 what m am0vsxx*c0h1e u-1 fdistance will it 1f1ca-u ms0*hxvmxe0be 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 frequencydpo+ v6bw q6,x of 1200 Hz. What is the frewqxdob+6p 6v, quency 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 thej1y4kl-gs y 7m ow+phcue5; 9h third harmonic of an open pipe is 900 Hz. What is the length of thsy7lh4m ej+1pw k5-y;ugc 9h oe 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 open p-m9aiikr.m 6*0p msfhipe of length L is 400 Hz. What is the frequency of the lowest tone that will resonate in an ope.f-mhmsp9i6a k *mr0 in 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 both ends has a length of 0. zcq2 fp55nyxnaa/q l-th5u--ypj8 o*80 m. If the velocity of sound in air is 340 m/s, what qlc5- yypx5o-na5ju* f8 pt2aqh/z -nis 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 bd.j1b98q 6p 7s sbcffa 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 closed1noo0rmt; /9n wrhew6edz72 u at one end is 330 Hz. What is the frequency of the third harwr9 mhez 10;r7n/nu2oe tdw6 omonic?

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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 en.mzsqg5(ejtut o 06-ed that will have a fundamental frequency of 60 Hz on a day when the gej6to05 q.m -tuz(esvelocity 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 whqv4;svyd )hf* ere 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 the temperaturk b:df/4 mb8k d;c.u/akvecb5e 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- 1u+m;5fw skp kqenuq,c) r9g m is played when the speed of sound in air is 340 m/skw) 1+rne -kp,ucq9s;g5qmfu . 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 len j6/.duq+ tlq:m8jclk gth: 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 freque:k j 8jtq+.q6cm/ul ldncy 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 80xkk 9-.egf4 hf )e-tuo0 Hz in air where the velocity of sound is 340 m/s. How much farther back would source 1 have h ) -efkkfoex t.u-94gto 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 th4b0d;)kcgqn r; 6 ugh0 8zw,s z sfmy1yuf6zn0e same frequency of 500 Hz. If the distance from a person df, u0y wgnz4;)0 syucg6n18sm hfrzk;bq z60to 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 frequencies of 440 Hz and 444 Hz. What is the b - w4,u+ hv* nfwglvgxofragez;c00g .v ).9jveat 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 grh,o:r: ef d,tune the frequency of a musical instrument. If the tuner oe :h rrdg:,f,hears a beat frequency 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 twt e)vltwk6 :1 sod1pw(8t4vsio horns are 6 m and 7 m respectively. What beat frequency is heard when the horns are sounded on a day when the velocity of sound siopwtsvt)6v :kl4 e(t11dw8is 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 tfvc hbpxq:cb17 u9x aq:f62 f4o 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 woulff19qvqh cbac4u7 x :f:62bxp d 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 13pe ,aj5i,qjj(cjg kf:kcj7y 1vu)-g000-Hz sound source at twice the speed of sound.fg aiucec)j (gkj vp ,:j5j,jyk1-37q The observer 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 a stationary observer v nh13ga4lef/j;d7iz at one-half the speed of avl4j h g edizn7/13;fsound. 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 li1mjhfa: u3--iz/nkbl1oz c/dstener moves with a speed of 30 m/s away from the sourcln- u: ja kzbdi1/mf1z-o3/h ce, what 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 siren. It is traveling at l.gf* 7 d6a+zel7nm ra :ds;bv35 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 stas6+f b7 llr;ngaded7maz:v* . nding 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 hewf+lau:zf o(5ard by a stationary observer when a train approaches with a speed of 30 m/s. The frequency of the traiff w( :uoza5l+n 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 1 vvee3jv-rch--alr:420 km/h. The train blows its 400-Hz whistle. Take the speed of sound to be 340 m/s. What fr -av vc:vh-jer4rl-3eequency 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. ;b)6*xlm2 yfxv*av pk The train blows its 400-Hz whistle. Take the speed of sound to be 340 m/s.xy* *vkfm x2p;lab6)v 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 (tb 1chtwm7n 3from you at 120 km/h. The train blows its 400-Hz whistle. Take the speed of sound to be 340 7n1cb (mtw3t hm/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 from ib9tvt -nwy(( you at 120 km/h. It blows its whistle, and you hear a tone of 400 Hz. Take the speed of sound to be 340 m/s. What is the actual fr i9t(-(t bwyvnequency 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 hor8x2p5p3: jq ok(u3yd 5pczzjun is 500 Hz. Assume the speed of sound in air is 340 m/s. What is the frequency heard by an observer if the observer is moving away from the train with a qc5j(kp: x z33yu8o2 ppzj5du 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 ox*1j(ba/uve( 6zhhfa f sound in air is 340 m/s. What is the frequency heard by an ohh6 ezaaf/bj (uv(*1x bserver 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 speedzjf2wf 20j/oqm1w: zp3vobb6 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 fas6jqp10 32m bfbwjf z2/o:wvzot 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 con6waw 7* xk69 ej5 dxoqjjmabh v::*v4kical shock 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 had)1aoye /*st gtk9rg6lf-angle of the conical shock wave forka 1t 9r)/6ygg *teodsmed?

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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 Statehgo4 ukomwm y7*/a 65ns to Europe with a Mach number of 1.05 w6*nah/w4gu ym7o5 mokhere the air temperature is $5.0 \; ^{\circ}C$. What is the speed of the plane?

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