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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 falseal4zj m+as5 1. djfl)m 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 conduwx,gb 75k2 exucted fastest 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 d ;vy1dv+ pf z s3d;e:j5twy 3eus7u3tsound 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 increases, what happens to the veloci*pkt3 q1p f56b- oh7cbxjaj:q ann, k-nxob7 0ty of sound? (Assume that all 7xqp,x3f -otk*kqo ahbb7:-bjnn cj6 p a510nother 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 ofw 7zvu; .e1nuo a 200 Hz sound through airuw;ez.1ov7u n 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 wavelengatga)k1 v d/wu(gnie s2s40q, th of a 200 Hz sound in ai saivku4enqda2 tw (0g/1s) g,r 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 zeh:x6 9 jm fl,ufc+jhc(jpjp+z)3p: greater 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 arrepf8s+55grav z c )x3)zgi rpv i9;t-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 uniformly in all directionsgn93pko3cyaw 8 o xjid952nsb0/ df/l. If you move to a point twice as far away from the source, the frek/9fj agnp5/ wynxi 9 ol3b30sc2do8 dquency 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 inl i*-*uqwl*es 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 sop3di icnj 6kl2ra 1vk+ ;iwv88 iu2do, cx9um-urce at a distance d from the source is I. What is the intensity at a distance 2d from thed nu+,- ca2vlvm;io93 i2c6dpuri881kxj iw k 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 radiatigdq.t4 v1ho -cng equally in all directions. What happens togdtv1h-4q co . 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 equally in a40ndez(f e zf /agp0knqn/6q x8k64xmll directions. What hap0a (e //6xd z0q4 fkx feq4pnnkgmz8n6pens 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 increasesy+j-1iq(atr t 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 speakerqw7pi 2g :n0+z7hy5plxm8xsp emitting a pure tone. What characteristic of the iwpm + nps 78:yx2zqp0 gx5hl7sound 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.zhpq,j/ :nlrcp. y 4tf z.dc.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 w p 1(asvuuvc)/vxw./" 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 air )s4 ( 6z8(jawegnqf zrinto 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 c;wf2p0n7 6 upouhdv2waves 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 guityw95w c4gz s+var string and the sound wave generated by the guitar as a result ofwz9vyw +c4g5 s this 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 whl;jej (rjo;0w e vg2q:dfs 35vich is open 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 dcdcfl4zra1 75s7 45mln9nlpof length L. What are the wavelengths of the three lowest tones produced pn4fd1rd794n z75lc slcla5m 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 u1grd8l.2g 8xz-m kaq Hz. Which one of the foll -8uxkarg.zm d 2gq81lowing 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. Which stp-( uj22xiapfa0n9ny3 s jt8 hatement is co(2 nx8n93 sjf aptuh2jaip y0-rrect?

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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 atojgh3c 7cu8r9 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.ukkf*sfro3z pth;:5kw ;jpnl-ly - 9: What are the wavelengths of the three lowest tones produced -lk rkphn-p; f:tzywos; j*:lku593fby 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 cl l)u0lwksks;c1t/nv ,osed pipe of length L is 200 Hz. Which of the following fresunktv)w s ;c1,0k/ llquencies 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 frequency.nzgug(f +pik7ii9*l / Which statement is correc 7z nil+i(k*f igg9u/pt?

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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 spea2qi;81- dax ttl. wgekkers driven by the same source. Each speaker produces a tot tq wek;g- 281a.lidxne 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 havesjjna*6ncrr/ ( ) j*kn

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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 soqlf(jdetk1 gc e 1..:zunded together and a particular beat frequency is heard. What happens to the beat frequency if the frequency cetj:.1qzf k.gd(1el 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 exp,o9+x 4kqksv6uz 1fof 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 stationixnmd85rgf, -)bt mg0dcl b8+kni0-cary observer. The frequency heard by the observeb,c ig88m gdt5nx-+cf)0bli0kr-dnm 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 from a stationary observer. Thy.i5;s )*ptb,axf) 5 uzeys sce frequency heard by the observer* ie; pxbtz,ys5acy uss.f)5) 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 wijms26c9x4 )tupda/ dv ll decrease by a factor ofd d)pcs96 /avxujt2m4:

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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 45abn)9 twu 53st7kzvdgnt*pt u25q(1p kHz in air is 352 m/s. What is the air tem3t1pk 2t5pdn*g(qtsn 7tuu bvwa z9 5)perature?

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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 tn 2txoh;w+vwm+9 m9amhe speed 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 ofh5v6, 8sq*iufubwbk;qw*9 u l sound in air is 340 m/s, a bat emits a shriek whose echo reaches it 0.0250 s later. How far away was the object that reflected bac qwqs;uh*u95 fv8ibw 6k*b,ulk 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 4.00 6 dzc )yht*h;zsje79as. 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 lightnintrkzx6 q.8 6org, the distance to the lightning strikt68zor6x .rqk e 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 temperatury7jr gnao 5;sk4r8vz.e 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 4kkyzs2 1g3*gq)ko kd the splash 2.5 s later. How deep is the wk* ks1 z odggk3)qy4k2ell? (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 f;aj+ x5kclg3t4bhj1z ejyj)*(td u8x requency 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 aprymnrck n(.6c; /+v $23 \; ^{\circ}C$ 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 intensico /vsai6a., zty $10^{-3} \; W/m^{2}$?

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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 jnosre1 /b-d7u/wgn g ty3 y13sound?

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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 wog*-efr82b*f4nf tj nith intensity levels of 70 dB and 40 d8-2ofe*rfnn4gt j* fb B?

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49#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The intensity level 28oh)yvtit d5p+p77nadwe / e by 15 engines in a garage is 100 dB. What is the intensity levep2yot+dthev 8p w)ae5i nd77/l 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 of 6.0 m from;tt 2/ vouznj0 a source that is radiating equally in all directioo;z2t/t n0vju ns 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 q 2j0v dts 5dctfi1g5mhv/49pm from a source that is radiating equally in all diresg0 5dvpt it/1dmf5 4 q92vcjhctions 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 qd6(so wq6u/w pf3yk0power, which is assumed to be uniformly distributed in all directions. What is the intensity level at a distance 5.00 m from thyu6sfqdpw owk(3/0 q6e 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 d2 sg (kx.-z f+;fdpbdkog. What would be fd.2+ps g kxfz;-bkd(the intensity level if two identical 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 ypcqw8 p0pj/)xl2e*zfx:: ad 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 source? Assume that the source radiates equally izxw2 08 :pp*p)jdc:/q l xfayen 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 57w.w03v pvaw v.0 m from a point source is 95 dB. At what distance will it be 75 pavw w3 wv7.v0dB?

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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 of 1200 Hz. What is theyuyxu eshdj87m**c8y 5/ce .7pa 8u jbi.v;lc frequenc.*mi yhy .c da u8ycb*e8j7eucul8v;jp /s57xy 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 openiecm2.fz0x6 blu /;vj pipe is 900 Hz. What is the length of thl2c v; bzj/6.0fx uemie 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 oqps1 ncvj 9a 8ak ;z,upq,d7s2f length L is 400 Hz. What is the frequend8pj2zqsusc7 n a;,av1 9p,kq cy of the lowest tone 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 both ends has a length of 0.80 m. If the velocity of sounq l3w :m;ajr:id in air is 340ml:r:w ;3 jiqa m/s, what 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 oh ;,9k p/+r.evq zuib lkps(-a 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 frequpnqr27w e3i w*aot)c+ ency in a pipe closed at one end is 330 Hz. What is the frequency*3t)e2wa+ocrw p q7 ni 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 shortest pipe closed on one end thh s5r)dj2o td6at will have a fundamental frequency of 60 Hz on a day when the velod s 6d)rhj5t2ocity 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 where the te2s /-yy*41r mtlje uurmperature 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 temp n7))3( oukheirhbf :cerature 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 sound in air cj 5s(ou 6gd+tto0n.tis 3t +t on6dg uso.50c(tj40 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 a;mr; fmw; wh3q(gx 7tvnd the other is closed on one end. If the fundthq;;v r7( 3xm;wm fgwamental frequency of the 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 each emit a frequency of 800s1 zjz.x5s a/aykje,- 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 n.z1 a 5 zjj-ssyxe,ka/o 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 v1 gsn* -jpjb41lhl i6by side 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 l 4i*s1 jj 6vg-nblh1pno 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 beat fresj)9)fjw q tgw4zcw*c4t:u9 cquency?

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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/s-1j 4*ikjbjnjht4p1cc8dzj o4*fk tuning fork to tune the frequency of a musical instrument. If the tuner hears a beat frequency of 2 Hz, w4-n 11c*ij48dj kctbj z*fpo h4k/s jjhat 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 two horns are 6 m and 7 m respecti29a7l nhka/nx vely. What beat frequency is heard when the horns are 9/7nla h 2xaknsounded 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 v4gy;p* c21mxg y9h+m gwj iu/iiolins in an orchestra are found to produce a beat frequency omjcw1y4gy+ *hpm / gg;9xuii2f 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 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 thez:4a 1+x53xz-hl lc, kar mfoz speed of sound. The obse-+43zcalaf, ko1 rz lxhz 5xm:rver 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 stationh x 9io4z 58bn/paiuj)ary observer at one-half the speed of sound. The observer hears a freq aii4u/zxj b5h8o9 pn)uency 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 o*hh,ws f,zbr *f 1000 Hz. If a listener moves with a speed of 30 m/s away from the source, what is the frequency heard by the obs,wh,r*hf b*z server? (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 35 m/s on a day when the sfv1) c g6rl7slv) k97imlxw9v peed of sound through air is 340 m/s. The car approaches g9flv)m7c r7vs 9i6l1v)x kwl 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 heard +(ymw :b2 ia4p igbpg4d*m/rk i (r9egby a stationary observer when a train approaches with a speed of 30 m/s. The frequency of the train horn is 600 Hz and ebgpkd 2i(yi am4(i * g/gwb:9rpm4r +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 tsvr1::z-(pax5sz z bcrain blows its 400-Hz whistle. Take the speed of sound to be 340 m/s. What frequency do yozs :cz 5brsza-x:(1vpu 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 bx 32 5lxv)ow6p( gbuzstationary train. The train blows its 400-Hz whistle. Take the speed of sound to be 340 mv( 5o3bwxzup lg 62xb)/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. ,qijba2oqc 0 vg,ry 6, The train blows its 400-Hz whistle. Take the speed of qacojg, 0i ,6 y,qv2rbsound 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 12oyby e9980i3)wkbhn o m;g+n f0 km/h. It blows its whistle, and you hear a tone of 400 Hz. Take the speed of sou39on+ikyb0m);ho8b fe 9nw ygnd 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 horvi: *- pk)mzodn 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 speed of 30.0 z):ip kvmd*o-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 spyt5thdfx;9mb bh: t,6 eed of sound in air is 340 m/s. What is the frequency heard by an observer if the observer is approaching the traimt6h hbt y:9f5dtb;x,n 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 cny:0n jxea1hrgo /0f ro6 zlxw62*g .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 the oz cxa o xn 0n2eh:*16 olfwgr06ygr./jbject 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 sphovzsy7x hj239 f*9 rvz b.,lvv;(gu upersonic 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-angle of the conical v3* gf (a25kq;qixaq rshock wave r5q fxq(i;a kqv3g2*aformed?

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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 Stk5eixvl1/hjcodt;71/wh r: tates to Europe with a Mach number of 1.05 where the air twc vtr/j/7k: 51lxhtdh e ;o1iemperature is $5.0 \; ^{\circ}C$. What is the speed of the plane?

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