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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 false statement? wq15 -4fh ynb pc+h ipdr8z1jfan;c5.

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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 throughknj46olaa 62o)e*ra u

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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 ( 9i;) (h .3oz1 feicseykqgafin 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, whaoe*5mf ccy 4p9t happens to the velocity of sound? (As 5yc9e*4ocm fpsume 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 velocity of a 200 Hz sound c3ezzb:60gw 2vdh 7is througz:vid2e w ch7g z0bs36h 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 wavelengtjrtq/ gs97t7b /6qg o/quyx9ph of a 400 Hz sound, the wavelength of a 200 Hz sound in air7 yqsgq 7/ou9b 9trp/gx/tq j6 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 freque;xdjr wifjca8a z+47:ncies 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 20kt;qs++dkh . q8dbx+j Hz 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 source is emitting waw s,2axeh91uj ves uniformly in all directions. If you move to a point twice as far awayus9 whx1ja, 2e 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, intq-r lge9)t dc)ensity 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 a distance d from the source is Irtzun 9 (0 gi.pbez+dad48 b2j. What is the intensity at a disb(jage n z2+rd t .b809pu4zditance 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 t-d gffczl,q+3hat is radiating equally in all directions. What happens to the in +c-lqg,zdf 3ftensity 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 equallgm/ va.z:r8jpi3gx3h y in all directions. What happens to the intensity level of t i:hgjg8v.pz33m ra x/he 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 fl(humxt 1./l 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 towar cf)6+ar muc7xd a speaker emitting a pure tone. What characteristic of the soundmxrau 7cc )+f6 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 a musical notet*x.rzlb0c rl z (f7h 0xn4fn;?

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17#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What determines the ys,t w1pc k7k0"pitch" 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 into lf5h x6 nu:jtj2 o*ml6water

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19#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Pressure and displaceme)d5u7xp b60*lbugn/bqa7p4 jq3g ham nt waves 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 soua..(ruuc2k8o inp2drnd wave generated by the guitar as a result of this vib 8kado.rn.2 puuci2 (rration. 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 amuvr:bmkf p) 93tkp61 kiunj1mb 68/ hny: v3nt 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 of length L. What are the waveli*az(mqplr8l /a4 x/ wengths of the three lowest tones produced by thi/ *r aw/l4a( lp8qxmzis 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 an8-5snk.tiz.q 2a iu kstd ha.. open pipe of length L is 200 Hz. Which one of the following frequencies will not .ua. hts- sq.2zt. akkiidn58 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 r;(r-y;onqp y ag/o s(,ewhm z*esonating at its fundamental frequency. Which stat;yez g-o;myw(sar(p n*/,qho ement 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 en gw2 vnc0gf22td 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 wave(yj(uwom qp05cy+8a ry6 zoo:p/s 9aslengths of the three lowest tones produced by this jq5a8ou9pom(yc sr+6s:wa0opy z y(/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 laysa0 nw0dye/vfl(:9nk 8j1dwy , yp9 k+7 cayength L is 200 Hz. Which of the following frec 1a:ywy+ 9 w ( fvpkja9knne0yad0ys87/,ydlquencies 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 fundamentphiia1 g;4oy)al frequency. Which stati4;op)i 1 gyahement 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 source. Each speaker u) m*vzhosxcw(v3bk( vh833z produces a tone with a frequency of 200 Hz on a day when the h vhz83zo u)(3v3bx smck*w v(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,t /b7uajb3l/pwdh*+mh( pl ) s the 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 beatdkdyz.xgyq e 27f;+t0 frequency is heard. What happens to the beat frequency if the frequenc.dzyy+2kfgx 0 e7tdq; y 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 explain6 +fiavh;6 n6/ r v7ct)rsvsuks

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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 sttr/qqjlzt1+7rv g(nw sj 83o-ationary observer. The frequency heard by the observer+njq v/ 37g8-wztl sorj(tr1 q 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 frequency heard,+tnczpm 0 o1w by the observeztw10, cmo+npr 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 doubl-a 8-0xtquolnzh8qovrw xf:y5 8)0 nwe its MACH-speed, its half-angle will decrease by a factor otr w lq-:uqxa-n z5hn80 o v0xw)f8y8of:

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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 ou-e*9o sylah 6f frequency 45 kHz in air is 352 m/s. What is the*o s-hu9ay6l 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 speed of sound in o-7el9xty. mzlhz n(0air 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, lw(kn0- tfrj 7a bat emits a shriek whose echo reaches it 0.0250 s later. How far awa jnlw7 -(krtf0y 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 cliffh efsmb, q9x4,dxy 9muyo4y3 /, and 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 p.-dyr5n)b hdiv5 sx 7s after seeing a flash of lightning, the distance to the lightning strbir7 sv-dx. ynh5d5) pike 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 .g182vx izt cbday 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 2pse c) mon1m+f :59k/m/lgoqz.5 s later. How deep is the well? (Ignore air resistance, and assume the velo1mm) nfo g+p/lmk :z59c oe/sqcity 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 frequev8 vir8o wld 1imyb ny5*1jl95p an4g0ncy 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 airc5f 7b,)ugdfu dzn x97r8bs: m 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 intensit jvgfuosr7-an4 2n 1,ay level of a sound 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 70-dBzrmy*-ry d1pq oq35;t no rl1, 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 a qonvg:,62fb(3mf eu of two sounds with intensity levels of 70 dB avg2 e:au6 (3mbfnfo, qnd 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 b(- uwhoajvahp)n8e8t *m8) yey 15 engines in a garage is 100 dB. What is the intensity level generated bajv 8uhetne oa*(-)88my ) wphy 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 ,gvj: jw75gh(cj sk:w+ m qu+em from a source that is radiating equally in all directi ,(jqwjs:vc w gm ueh:j++k75gons 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 k/n,6leer- p ysource that is radiating equally in all dirr-,6 eklpen/y ections 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 1gh +3gcwxj. m: mW of power, which is assumed to be uniformly distributed in all directions. What is the intensity level at a distance 5.00 m frommx w+cg 3gj.:h 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 distan6imp j9hi/e1kce 5.00 m from a barking dog. What would be the intensity level if two identic6m/ ejiih 19pkal 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 soun52v ljzi+l4hxd 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 radiatv4 + 5jzlilhx2es 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. 6. u /v dq *;mcvb7c,h: t8llozgmro-jAt what distance will it be 75 d hbtm,u;7g/8lzm:volcq.6jc*ro-v 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 frequency ou pim- 0j :6j9:dgwzqef 1200 Hz. What is the frequency of the fourth harmod i-pem0j:j 6w9 qg:uznic?

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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 900 Hz. What is the l91t(c/h wnzofength of tfz1/o(h w9nct he 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. j..v7 kd vc5lk.7eyhs What is the y sj.hevvd75l.kc.k 7frequency 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. Ife* e9yrfq1a3/-jux.y+kf da o the velocity of sound in air is 340 m/s, what is the frequency oa x -qroyu3 kd/efeyj9*.+af 1f 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 a room whep02zp ukn lc9(g6t0 vdzj1;i rfa,g9ure 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 closed acgj udxzt-s9eaa2ppzy /qu,5 p f+: ++t one end is 330 Hz. What is the frequency of t,+c: +p zytjzaaq9/ d+e p2p-f5sguuxhe 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 6euw.ge4pp ; jqve5r) end that will have a fundamental frequency of 60 Hz on a day when the velocity of sou4;p jgereq u5e6).wpv nd 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 temperature isfs 8-:xjgt,ynzmse-,om- b * y8s(fjc $20 \; ^{\circ}C$. 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 sv/g7sg 4qeim+pcp:0erature 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 speeiis8i3z v w*a48rhkl s( gs;6fd of sound in air is 340 m/s.lw( 8ak sizs3h4gr f;is*6i8v 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 closed onm2e h7-/cow)cdvr82j ,9mqom,fl tgj one end ,lm,jov9ed2jm o-7ccm 8q2tf h/gr) w. If the fundamental 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 800 Hz in air where /hla+nj teo 8esi0l3( 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 tsi8hn (te+0lea / 3jlohe 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 )2viwvjl g9*scl;1 et 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 foll g1e9v2;icltsl*wvj )owing 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 Hop 6b(sch5:hypr ,cq6 z. 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 t 0;u5ya hbgs7ehe frequency of a musical instrument. If the tuner hears a beat frequency of 2 Hz, what is th5u7g seyb;0 ahe 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 producedh/ v8*aa klm44 ld-;lyol ,ydc by two horns are 6 m and 7 m respectively. What beat frequency avmkyh4 o,cl l/*4 ;l8dd-ayl 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 or x rz;8vq nw gl+9nud-9w3:eghchestra are found to pro l w3 qgrdhv+ ug9w9nnxz8;:-educe 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 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 a 2vs+yiyx:.:e1mz 2 fnzn)okgt twice the speed of sound. The observer +vnmy2 : ziefg oy)kn2 :1.xzshears 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 stzlm+h(:ic .im)p bdiq m9m. m6ationary observer at .cmm pm.mi(qbmdz+)i i6:9lh one-half the speed of sound. 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 frequenczvbc2k 49*etu y of 1000 Hz. If a listener moves with a speed of 30 m/s away from the source, what 9kvt 2u4*zcbeis 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 travelind7* u yqx,uu0r+5y( a9rqxwtcg at 35 m/s on a day when the speed of sound through aiy0qrax xwdt7uyq5c* r u+, (9ur is 340 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 heard by a stationary observer when a traz.mm)d8c vqdbzp252 p in approaches with a speed of 30 m/s. The frequency of.z5z) m 2db2cp mpq8dv the train 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 120 km/h. The train blows its 40q*qjf3/t)zd g+y1r hs go;vp 00-Hz whistle. Take the speed of sound to be 340 m/s. What frequency do;ft *yv3o/ r0g1j)zgsqp q hd+ 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 towa3 r.vd( 3ueyr -bpqcp+rd a stationary train. The train blows its 400-Hz whistle. Take the speed of sound to be 340 m/s. What frequenpr(r3dp3ucvy .-+b q ecy 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. Thed9n 5jjb.x )c6kmk ,vw train blows its 400-Hz whistle. Tak bdw nj59,k6xmc)v.jk e the speed 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 whistle, and yoexv0 5k+ovpll8ivnou4 id0 2 (u hear a tone of 400 Hz. Take the speed of sound to be 340 m/s. What is the actual frequency of the whistl4lp80i2e doo n xk( 5l+v0uivve?

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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 speed of sou*;3i+o/n koii)9 l: vxdmtw gbnd in air is 340 m/s. What is the frequency heard by an observer if the oi n)x9mt/b dw3*ivg:o;iok+lbserver 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 traor2+5l(tvkpw: iucxiv):h ,orrw 3v7in horn is 500 Hz. Assume the speed of sound in air is 340 m/s. What is the frequency heard by an observer if t,3x:) it(vivl rcr+kuw vr 27:opoh w5he 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 theatfet i7 1bo-8a4st i1 speed of an object. A 40-kHz signal is sent out, and a 42-kHz signal is returned. Assume the spee7-4a1ibeso8t tia t1f d 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 shock wave produced by a sqwgu bvbj2dqw31m;- * 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 au8w +tp o (*pb+8/xk: chgoxqof the conical shock w+b/*: co p(xxwkthqag8 +uop 8ave 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 Uni zz0.(p2g fkxnlyhf-2ted States to Europe with a Mach number of 1.05 where the air tempe0lf 2nkhg . zfpxz2-y(rature is $5.0 \; ^{\circ}C$. What is the speed of the plane?

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