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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 followirx7s ,yd4nrkuj c(-a+ia wn7,ng is 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 fastes12 ybl u ;i,iio 0hkh:voa-vu0t 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 soundmr p1qjmx*9q. in 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 in2h;aht8w+t omtyat.u4 /in: j 7num o,creases, what happens to the velocity of sound? (Assumeoyaoai 8tu .hnmtw+4n2hu; ,t /jm :7t 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 velo6e,lo on-o:yps*3)kdtel 2) )fbgk;lyw 9mqqcity of a 200 Hz sound throug-;w:y)9keyool)t*mp )b3d qklqle6f s g2no,h 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 waveleil 7 pnyz6:d*tngth of a 400 Hz sound, the wavelength of a 200 Hz sound in air is*d ni ltzp67y:

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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 t b o:k/byhi ypiy,d7h9 y*fb/+han 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 are calle54v2bi eojnv 1d

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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 directuqc4k*b g9p.sions. If you move to au q sb49kp*gc. 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 pr9j wy13k(bbxmc71 kkmoportional 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 from the source is I. What is 9iwc;j:jl.dq pw0x 5i the intensity at a distance 2d j;50.pixlid qww9:jcfrom 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 distancv6k v,e/k /6ar;jsp)jlz a*7 mwckug )e from a sound source that is radiating equally in all directions. What happens to the int u wkk6*gcpear lmv/zsj ;/)kj,v a67)ensity 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 equzrcr u1.(ko .kally in all directions. Whato. (ukc rzrk.1 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 jb 4 /vzolhn/ .dpmh;7as 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 em 5 bj(n.qa6dgab4kvpz6w; j*yitting a pure tone. What characteristic of the bagp6kd(.bw;nz5 *vjy4 6jaq sound 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 rhz-m5p/ hz c3p+(drra 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 musirq.ii,hd(d1 lcal 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 in9,ch k w*4ve(hshnp7pto 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 38 0 ko p9vfj;hme,sufwaves 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 guitdo bwlq(0 de tm;,9.ivar string and the sound wave generated by the guitar as a result of t m dvo0,wq9i;be .(ldthis vibration. What 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 open at both ends, lnh*)tcf f)1oj7 3 x k (uz9qtjqt5-nothere

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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. Wh2 my)z6rpe /kufo5 4+y)bxs fwat are the wavelengths of the three lowest tones produced byswfm fyy 6uk2pe))zxo b/ +45r 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. Whi;1 t-o2z:jrslylh+nl ch one of h st2j1-rno+; yz:lll 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 funfd9r8h r2g;ip35 na tcqi* vf*kal f15damental frequency. Which statemdf2 *f ;hrkfp359a rga1l 8icv*n q5itent 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 d z-eo0uwq3m) is open 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 wavelnarrk) s7mc e8q4+b+uengths of the three lowest tones produced n k47esar 8qcb r+mu)+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 *:7w uzncbbw ,in a closed pipe of length L is 200 Hz. Which of the following frequencies will not resonate in that pipe?n:uw7cbz*w b,

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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 yj4lu+aki,a3m x ls5mr i18e et7e0r:resonating at its fundamental frequency. Which 4eayl sa,i3 t58j kir7 le+:me0umrx1statement 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 s yq5p0ze 4-od7amj05 gxkzi;pource. Each speaker produces a tone with a frequency of 200 Hz on a day when the speed of sound is pdm ex07a4 0gkjqoy pzi-5;z5330 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 waveb99qp;z qm,fx ,jjgkh 59sua :s 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 frequ kr zv 2p6 *j4.iydc.umuty9z6ency is heard. What happens to the beat frequency if the frequency of one of the tones is incr2jzcuykmiv *ru6tpzy. .d4 9 6eased?

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32#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The Doppler shift exp9sl4zo b .14ghlg2a6pmyam/*qpfe.5c c i7o klains

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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 hq: j5ce.nvd 4aeard by the observecn a5:jq .4dver 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 f4du *on4ng r9srequency heard by the obse *u9osn4 4gnrdrver 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 decrease by afv5aye)l0(m u facto0ly( auvmf e5)r 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 bd1ob3rhrxw.: 2j k6o 45 kHz in air is 352 m/s. What is the air1owbkx:3o . bh6 2jrdr 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 v,o)bc+0v:w( jv vfkbin 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 shriek whosegde1 ;0ln mf/5t)9 hp md68smuhdfn0m echo reaches it 0.0250 s later. How far away was the ofmdnd;g t)h0n85 1lm9fs6 hdmu0p /mebject 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 heh54 *bz8+famsth2ewm ar 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 lightning, the distance ohhmgr jb (*: 3nqod/kk2,u2f to the light hq b o*gr2h:n 3/ojk(2u,dmfkning 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 or b np++:q qw7n-sb1xnn a 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 he3h (6ey tr aghb3qsln.r0+8ak ar the splash 2.5 s later. How deep is the wel6 qra.hl0n+ 8eb(sthr a3gyk3l? (Ignore 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 sound wave of fr8 n*y- 3jrfhdgpw/ jqqaiuddrv(/ .. :equency 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 wrom;8j2jwbio dyi ;y0 4k)b.$23 \; ^{\circ}C$ 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 764rh z;.fr)kdnt y8:ffgxb c 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 intensity of a 7( n5 s3/ 9pq:+-x+f vezkfrcfogfrg/yqp 2n5d0-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 iar 5*5; x. 4dz/u iquc ;si7nnnls.:hjf5j pxintensity levels of 70 dB and 40 dBusx.s5 zqr:h/ iinajl n5d;x4c uf; *.p7ji5n?

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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 dnmbs 5( -v:c nk+iq2tbB. What is the intensity level generated bicb mns- 5(nt+2 kqv: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 g94z: m zhjtvll)5wo: is radiating equally in all dir : g9t4l)lz5ojz vhwm:ections 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 ibm4rl v/ii0f 76/7q7zdbf f dxs radiating equally in all directiv4/l b m6ir 7qzf fx7d07id/bfons 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, wh/j3j+t/4xddo:f k frbich is assumed to be uniformly distributed in all directions. What is the kj /bj f:/ rd+3fxtdo4intensity 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 bn h ov7e-46bncarking dog. What would be the intensity level if two identical dogs very close to enne4-cob vh 67ach 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 intensity level is 60 dB 8o 33oj j-rik6k4mhqrs/cc;.xj -kgu. What is the intensity level roisj3k;-.-jj cxh /u ckqk6m3rgo84 (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 fro y0+iji ;hth)um a point source is 95 dB. At what distance will it be 75 iy)h h; t+ji0udB?

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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 compqi t5xp mrnn g0*35y)alex tone has a frequency of 1200 Hz. What is the fr 5q )*mn5tayip3xnr 0gequency 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 s )8vmes:rp-:.nqeui harmonic of an open pipe is 900 Hz. What is the length ee-.:ms p :unq8)sirv of 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 pipe of length L is 400 Hz. What is /t. ;yvyw whm8the frequency of the lowest tone that will rm;/.yhw w t8yvesonate 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 both ends has a length of 0.80 m. If the ve xwe/ e8l-q9a5*vajbelocity of sound in air is 340 m/s, what is the frequency of the second har8l9-ja e5xew/a ve*b qmonic?

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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 teceldne6(2f1q)1q2wihi -z jtmperature 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. 0o6he::v ew3w wg kzx0:pemp1 What is the frequency of 6wkz:w01 0e oe px3h emwg::pvthe 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 shortest pipe closed on one end that will have a fu qz;x+bh )q,.w9oofh,l gv5wp ndamental frequencyzxhv 9phfo+;, g,). w5l qwbqo of 60 Hz on 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 is in a roo ,j )uu0y2 tx7 jy6byf),pprlzm 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 the te *:n:hd7wiyihmperature 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 t7 3duc6e47wu oml: cqcstlxac:335nk a-dt- qhe speed of sound in air is 340 m/s. What is the fundamental frequeue 7c:-l t:qmludwa3 64 k7n3csx- adtqc5oc3ncy?

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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 sj g5sde1t x+ :cq2.gvthe same length: one is open and the other is closed on one end. If the fundamental frequency of t:1x gj gv.qc5ds2e +sthe open pipe is 300 Hz, what 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 eaca/v v/h2zyduh+ 0.ta rh emit a frequency 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 sources would hear nou + a0yh2tvdvh/rz./ a 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 sid7n5i)l.x n vvde and driven by the 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 othe57.n ilx v)vndr 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 o6t7r8o1j6h0 s-n bcfso7 gxyd z:uw+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 0*9nallc5d28a m e yavtune the frequency of a musical instrument. If the tuner hears a beat frequency of 2 Hz, what is the na0m52cdy a8al9e v l*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 3ayw k2hmq.9q sy.v-g 6 m and 7 m respectively. What beat 2gy. . wkqqy-a93vmh sfrequency 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 vedhc9:1 f71k iqjed0niolins in an orchestra are found to produce a beat frequency of 2 Hz when a frequency of 660 Hz is p dec70he1i9:djf1nq klayed. 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 sgs):aq)k ub,e peed of sound. The obserge)sbkqu :,)aver 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) approat5 0;lltfqg z tq.oe31ches a stationary observer at one-half the speed of sound. The observer hears ;q f5qt1lt0te 3gz o.la 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 ma ( :wqgk02vyof 1000 Hz. If a listener moves with a speed of 30 m/s away from the source, what is the frequency heard by the observer? (The soundkav ( w:gq0m2y 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 travelingz14ub)inqkz k g:6lv( 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 chaq)v:(z16ikk 4uz ng lbnge 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 stationary observble0de+o 0fr5bbh* dtd 3i8 9f*yv;tder when a train approaches with a speed of 30 m/s. The frequency of the train horn is 600 Hz and the spfyi*t;fe0vdbr5odl +dhb 0b8dt*9 e3 eed 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 1fb7jcpus3cf s40*0 t.mjb9cc20 km/h. The train blows its 400-Hz whistle. Take the speed of sound to b j 0c4cm.f3pstj fb09sc*cbu7e 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 traizflt0 su /11yh4k,leis )qf4 cn blows its 400-Hz whistle. Take the speezc1qfh l4s0uil1/4e, f )ky tsd 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 .ygq)v(yvrwm38a 2 v hat 120 km/h. The train blows its 400-Hz whistle. Take the rv h3qyv8y2) gvma(.wspeed of sound to be 340 m/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 whis+ nh3w8b9kah;cg(f/ u cu mtd,tle, and you hear a tone of 400 Hz. Take the speed of sound to be 340 m/s. What i+u nkg3cd,w; 9mh8t/ bhfcu(a s 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 cqro i*aght2ao-c04 + speed of sound in air is 340 m/s. What is the frequ0oc2 4tao-i +hgaqrc*ency 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. lia w;9uur5u 6(zxb0p Assume the speed of sound in air is 340 m/s. What is the frequency heard by an observer if the observer is approacilr bzxaw06p(9uu ;5uhing 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 s7eb;im8fz08okjel , n; ws x3object. A 40-kHz signal is sent out, and a 42-kHz signal is returned. Assume the speed of sound is 345 m/s. How fast is thebsw7s emzkoxil83n8fj;e ;0 , 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 supersonwk b(dly:;c/v n4q-ocic 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-angliiu. ogmf05 e(e of the conical shock wui.im fg(0e o5ave 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 fl9g8 g + oizci(r.t5xst8e4zebies from the United States to Europe with a Mach number of 1.05 where theixe.54tc(zb zg+is9reg8o t8 air temperature is $5.0 \; ^{\circ}C$. What is the speed of the plane?

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