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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 fahq xc(c3lz 2 w.bi,y1f6 hj0fplse 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 i*bl.of :ej: z abp9n0fastest 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 rodn+i )yojohp 8h;0 r+bf?

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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 happens9/1 jlpccxw 1 bgk52bw to the velocity of sound? j/ wkwg19cbx1 cp5 2bl (Assume that 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 vem 3yhe9fio9 ;xlocity of a 200 Hz sound through air3h mxye9o f9i; 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 wavelengtha/w eu gh3+7gjds cxiy.e0 u09 of a 200 Hz sound in a/acwg7ye .ugjse030u 9hx id+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 than r7bj5gwm(3 pt+n mj9m20,000 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 cal0 r hfkb/hbg z/tcw;bn-9b6/dled

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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 sourcehpv0 5;(g8pth xi ;8c5mf o8d( bkubte is emitting waves uniformly in all directions. If you move to a point twice as far away from the sod( 8;cx5(p uothkh8bpvbit e580mgf;urce, 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, chsxpq1: r+m+h 6hox y ;2h2uwintensity 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 .zt su;vcq-cy8 0p3 j-p* gqdxa distance d from the source is I. What is the intensity at a distance 2d from the source?y3uc stg .qc-dp 0z v*;pjq-8x

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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 sourceelgvl51 0 :iac that is radiating equally in all directions. 1e0i5l l gavc: What happens 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 radiating eq 07 3fazvjmkqnya1w 31g uj0*xt)dsd 5ually in all directions. What happens to the intensity level of the sound? It drops buv)1dam 0saq1gwjy*z 5fj3xn 3k t0d7y

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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 o,kmue 68wj 6 jz08mpvas 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. What characteri0vg 5febk3accyza+g1 )t (6etstic of the soa6fyce3 eg0k1 cbtzg(v) +5taund 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" iiz(ct/mekys:,jb .0of 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 musicarqi+g9fe7e1(xn-s/r7i- a q q6sijkcn :mv1t l 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 wateqvk4 pgyxs4*,u,li v46 ,fgvw r

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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 akh.2v duu5,gdieh e ,7re

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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 thr7fa31l 99fi yys*2tmsd53ztiw 1v pxe sound wave generated by the guitar as a result of this vibration. What do these two wavy9 s 59yf *3daim 3t2r7lftxpwi1z1 sves 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 bogogcvoi2g ; pve ,i:3*th 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. What are tvv:ykuck 76-i6u 5agghe wavelengths of the three lowest tones produci:uakv7 c-kvg6y5 g 6ued 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 pysx/5 la -kys: lw.u2one oflysa/l x w:pu-ks52 .y the following 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 resonating at its fundamental frequency. Wawmm0 s+ x6hd7hich stated6ws0h7ma+ xmment 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 closed at the can6r*6 wnfat9l*9uc 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 leng5f o8ao7 6ccd3fz) :wl7az9 ;b esjlrpth L. What are the wavelengths of the three lowest tones produced by f75oz:b68jlr9do7 ;wlp )ec3 csaf az 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 resonatelh7 l(au8sp)z;e/ lk f+a- ruu in a closed pipe of length L is 200 Hz. Which of thur(7hk)ulpe+8 /ual s ;flza-e following 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 at its fundama;vl wfo1dg+ 4boam(7ental frequency. Which state 47og+afvm;a(bd lwo1ment 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 same source5vgil 1,5t 0bjh)z9yokzx: 2uf4iw xc. Each speaker produces j: gifx iv5yzb1wu k52tox09 h l),4zca 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, tmpe,v p9*jg4c;y5ab qd4 )ylrhe 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 particular(b2,6tq ;n)l.xffyi7lv pkzf vz)vw- beat frequency is heard. What happens to the beat frequency if the frequency ofv7w;,2il)lt6(vv bfkxq .yznpf-z f ) 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 explains5v) 44bvop ekv

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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 eznb5kx ycjob2/14: i the obse5cn:oe zi21 jk/bby x4rver 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 depar okamaqy 6k y12p5a8.kts from a stationary observer. The frequency heard by the observ 2yamkkaq865.yakp1 oer 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/ hv7a*yw;datizcr ,6 its MACH-speed, its half-angle will decrease by a fact ;6c rza7tiw/yd,v*ha 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 45 kHz in air is 3q g2rkcf 2g*g352 m/s. What is the airq2 gkg c2*3gfr 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 sp7xd.t crrn,. peed 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 emi j 6;bl v:av5c onfk6*4sus;upts a shriek whose echo reaches it 0.0250 s later. How far away was the object that reflected back the sounl p6v*suf:5k4 o;6 cv bj;sunad?

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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. 5 ;de vk*9 nxxkr8lq2l 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 distan4yj g w-r wal0px9u)6mce to the lightning strike is-ylxpg4u0am w)w 6 9jr 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 jz6ic 93 vemp1day 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 w rd om.8q 7e;ydo0;pctv. ru21d evst9ell and hear the splash 2.5 s later. How deep is the well? (Ignore air resistance, and assume the velocity of sound is 340 m/9m7td0 2e;o;vdrrvscty q1ue.8d .ops.)

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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 odcpy 5(1zrkn8k;y3ed f 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 air at b h25 or ol8i)i6d1tat$23 \; ^{\circ}C$ 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 wl 5r+iknax hv aih6828x r)*whith 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 5 a3du xy+wx,c tru:3j6/ mcvlhtl 4*usound?

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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 ir+c-2;ow-p f9h 8n vv,.kt ajutvcg (cntensity levels of 70 dB and v kw, 8-pvn-9tghcrvfc+ .c o2;tuaj(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 intensit3o:3zcv m z nw41roiujy(h)n :y level generated by one engine?nzwn3:(1hco i3 4z)ry vo :ujm

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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 sourhvp 3rz iik *uj62)2xdce that is radiating equally in all directi36x*r dv2pzk i u2hj)ions 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 i *gynapmzb;)d44an fj l44 9ugs radiating equally in all directions is44fzm)lpgn*gja du bany 9;44
$6.0 \times 10^{-10} \; W/m^{2}$. 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 uf,cv 9iq g+l,40ol6p fm1liz5n n8iuassumed to be uniformly distributed in all di6nll,51u+qpfl8 mfv, u cgiii4z n9o0rections. 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 dovlk o2dz+g+ m7g. What would be the intensity level if two identical dogs very close to each other are barking?g+ l+72mdkozv

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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 sowc k sotq ;u/6vk x5(b-ko74fturce the intensity level is 60 dB. What is the intensity leveksb tw645;qvfxuckoo-k 7 t(/l (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 i 4pl7i,z.ccn m from a point source is 95 dB. At what distance will it bi4,lnic. z 7cpe 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 fwdwdb.av 2l:u.-7tu5 u6gqf frequency of 1200 Hz. What is the frequldtb2ufva5 u u:df g.w. -q7w6ency 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 pip1ziew-,wli ,wq(w x. ke is 900 Hz. What is the length of. xww 1qelizkw,( i-w, 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 open 8(p8fc t-y4q ky* fvilpipe of length L is 400 Hz. What is the frequency of the lowest tone that will resonate in an open pipe of yq84f( vlt8p-i kfy* clength 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 hx lig0v/.jkv: as a length of 0.80 m. If the velocity of sound in air is 340 m/s, what is the frequency of the second har0/: ijglxkvv. monic?

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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 t) 5,,z t fgh g,r1 dia,9btbup7 ikbxgo;e)6peemperature 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.9 qmld-,bx4kz What is the frequency of the third xlmzbq-k ,4 d9harmonic?

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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 end l-ec+e: s.1l 8p1qreadgbuj; that will have a fundamental frequency of 60 Hz on a day w r ll.-qbee+ap81 ;ecg:djs1 uhen 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 whr:e hlj-c ps(/vg j9y;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 temperatuu-:z / d 0ln6wvd+izeure 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 of sounfnuj f8v6pm3h:ohr i,9wp k*0 b.ed -dd in air is bfk.i:p0dp8hn3 e,j9 *frmvu6wodh- 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 length: one is open and the other is close)qkc 74k/wyt i+.ji ted on one end. If the fundamental frequency of the open pipe is 300 Hz, wt.cy)qi jktkiew 7 +4/hat 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 Hmhfv:ug /qd qul4c 2*4z in air where the velocity of sound is 340 m/s. How much farth2/mvh qcu4q*lf4g :du er back 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 frequency of 5003 t8hh -zjyuv1 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 jz1hvy8ht- 3uperson 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 l2an/befxls6-nn vv4h/ (p4f 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 + /pl7ofa7ybslcp/l* the frequency of a musical instrument. If the tuner hears a beat frequency of 2 Hz, what is theof+l cy/pb s7 allp*7/ 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 respectivelyga abc8/u ymkst*3*4 k. What beat*yk/3amk84 a g *tcsub 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 ol+j9pr4n v4 ferchestra are found to produce a beat frequency of 2 Hz when a frequency of 660 Hz is played. What percentage change in the tension ofp+9jnv4r ef4l 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 1gw*a5 k/*yhf h:8qor-l; e 1ppaqa8lf 000-Hz sound source at twice the speed of sound. The observer hh;:- pq18*ef 8lq/prwylgkof 5 *haaaears 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 fgztskc erg:2+k,n 9)of 1000 Hz) approaches a stationary observer at one-half the speed of sound. The observer he : rfkn e2,+tgk)csgz9ars 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 1j df6j6p9si gof 30 m/s away from the source, what is the frequency heard by the observer? (The sound speejij g6196pdf sd 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 35 r.;gv trhn q8ju 3kilx w435t1h3dgh6m/s on a day when the speed of sound through air is 340kxjth h8314ig3gr; l5hru dnv twq .63 m/s. The car approaches and passes an observer who is standing 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 heavgxh ;ux45bb;rd by 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 x5hg ;bb;xu4v 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 blows its2sa gbo5b+ajjm8p e :-of2-mu 400-Hz whistle. Take the speed of sound to be 340 m/s.josbm+a 52uja8 -pg:bm o2 e-f 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 t4 e+xdkl 0 +xcrc-.u;5zozycxoward a stationary train. The train blows its 400-Hz whistle. Take the xd05+ ro+e4zz ;-cyxxu klcc.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. The train blows its g v+84p n:pflv400-Hz whistle. Take the speed of sound to be 340 mf +pv8g p:vn4l/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 you at 120 km/h. It blows its whistle, and you hpr01 *q mtmz3cc 0lbz6od 6gy0ear a tone of 400 Hz. Take the speed of sound to be 340 m/s. What is the actual frequqm b r zp6yg*l1mt c3do00z0c6ency 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 8f ;p0mavp8+* y;xkk j-x fbebhorn is 500 Hz. Assume the speed of sound in air is 340 m/s. What is the frequency heard by an ob0fm8fv;kb*+8xp - exkj b;ypaserver 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 the speed of sound in air is 347,nrj 0ivy h(v4 mu ugup.x)i:0 m/s. What is the frequency heard bi(gunpj:r.7ux,vy4 h vm0)iuy 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 object. A 40-kHz sxf ;kxa d ar:0jnk,5cy-x c(:uignal is sent out, and a 42-kHz signal is returned. Assume the speed of sound is 345 m/a;uyn c-0r5: ca(f, kxj xdxk: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 :c8r2 viu yd-aproduced 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 yok0 q,ky-w(sMach 1.4. What is the half-angle of the conical shock wave fyow-kk s( qy,0ormed?

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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 fromhsjl cx ;-9t3d the United States to Europe with a Mach number of 1.05 w3s 9xdl-c;hjthere the air temperature is $5.0 \; ^{\circ}C$. What is the speed of the plane?

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