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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 statemea j5x ,:9tsejl) zg,lf,9 lmhr9gos2hgs xj;2nt?

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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 fask r1vt*ylvr(2auo7y +test 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 itybp ye3co*/cv8n d:,n 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 int5zgy gq 5 qr41)qbtb2creases, what happens to the velocity of sound? qyb5g)z1 r254tq gqbt (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 ofns a690 asoosgmcj0 lxa2*7i+ a 400 Hz sound, the velocity of a 200 Hz sound throughsc 607on0s*a9aj+algi s xo2m 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 wavelength ofn02gni*r7vzfgp9o 0)3d gt q d a 400 Hz sound, the wavelength of a 200 Hz sound in a )9f0ti*2gq3v zd0onp7gngrdir 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 freg 4 ik,6 y4-jt8yohodrquencies 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 freqdb ylemx c2bm khc 0:0r68ol lh9y*p23uency less than 20 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 waves uniforj v(87x(h6/ edhduuxt mly in all directions. If you move to a point twice as far away from the source, the fhu7/h 6vexux(djd8(t requency 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, iq:ti,(kpsf h+ ntensity 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 thd5ny (+;yjm xsld39tqe source is I. What is the intens 5y9n 3qyds; l(mdxtj+ity 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 source5e0e zn8f;8hd6fq nf/2n de oc that is radiating equally in all directions. What happens to the intensity of the sound? 80/d n; fen86 efqzo2cdfh en5It 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 shwvi s e1lzr6e):x ga)9 +;oqyource that is radiating equally in all directions. Whlze)r+6a:v;i9x )s gywqo1ehat 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 n9v-:1gqqyfl 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 speaker emi5l eu pa *yejkt;jwo,4su20c6tting a pure tone. What characteristic of the sound increasess0k4;le5 w ect2 puujayoj *,6?

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16#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What determines "loudnr+v/m0mv)..dzuf jrz e 9 w.gdess" 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 "piwyf ht:tu(6tg9ox0 g9tch" 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(adw.vv dg*1r 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 waves bl6gok ibj2yf l. v24.8(m uimare

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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 l-.16bgwsc lv the sound wave generated by the guitar as a result of this vibration. What do these 1csg.lv-b l6wtwo 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 whicd/f5c c;j 9wi vt tfg9rw*7g0zv(p ty7t3 *jgvh 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 of length L. What are the wavelengths of the three /9 glqn9)apby o9cb *vlowest tones v9a/gn99q) c*ybpl b oproduced 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 one xzgc1-x4jk i2of the following frequencies will not resonatx j-4i2gxk1c ze 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 fre y(:kcuy4 qi759 l*kckv.vnjmquency. Which statement is cor y:. cyc7km5kqvi(ju4 n*kv l9rect?

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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 andz;ze r)am3 tt- 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 length3;b+hgwlyt9(xwz 0 :v9t kbhj L. What are the wavelengths of the three lowest tones produced byw:h9b +gybxt 0 hvl9z3;(w kjt 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 lenghc,yi9jyc -8s th L is 200 Hz. Which of thesyc8h -9cij,y 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 fund:f2tc3 rpf 3keamental frequency. Which sp cf2 f3rt3ek:tatement 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 spea bdxazpb:- 2br-eu2y;ad :1sqker produces a tone with a frequency of 200 Hz on a day when the speed of sound is 330 yb q2e:2-b rapb;z:s d1u-axd 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,*hnp5 9(ryz 9pynw(jod*k9e l 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 particah s09fjg 6;j219/ypmzzf vta ular beat frequency is heard. What happens to the beat frsf6ytm19h 2gfa/zazp0j;9 jv equency 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 explainti2c*f e te7 yknp4o0z fe9-)cs

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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 statj 51s:v cui0nm: jj5br9li1wd ionary observer. The frequency heard by the observej v51u9bmj1l: :s5di r0ic njwr 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/hyf1 20+w)gnzlgb rt,dp.pr 1b/gfp heard by the obsprgp,+/dwhtfyg. z/1g) 201rb pfnlberver 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 93lp -avhuz bf3wt*(bMACH-speed, its half-angle will decrease by a fac (lb-9t p 3vbu3fzhaw*tor 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 4ba,t oovd3ji6qg o+a;76l gs(5 kHz in air is 352 m/s. What is the air temper7ov3aj,bg(l 6;oo+qd i6ts agature?

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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 th fn .ecskq*57ke 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 of sound in air is 340 m/s, a bat6ybb n85sw m3x emits a shriek whose echo reaches it 0.0250 s later. How far away was the object that reflected back the 6sx 8y5bmn3 bwsound?

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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 thewk pyql3 tq(6re*oaoub)4o 3kvydl4 58(fa l ( 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 flaig v s(:-qv:swsh of lightning, the distance to the lightning strike is aboutviw(vs:s-qg :

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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 tb5 sxv41bizn3+h 7 kneemperature 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 s later. How deep is 3y7nmvhaj cm x)pvz4 : pbp*97the vb9jz py37)va7cmp: hpxn m4* well? (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 frequency nqu j0*zp9w 8xmtfb f-jf241x500 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 airvad2 y13 5vlzb 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 intensity level of a so :*hytnk )ri;uund 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 obcg a1toyk)s 4)q5ej b.. wcq3f 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 intens1uwu4bei; (vtki.5zpyj8/jm i .p s)m ities of two sounds with intensity levels of 70 dB and 40 dipiiju4m ) 18(swybpumv e..5tkzj/;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 by 15 engines in a garage is 100 dB. What .k6 r2ds8c6, lgsanhmmf4mq .is the intensity level generated by onehks,d8f m.ql6 rgs4 ncm m2a6. 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 is radiating equally mc:txm1o8eh: o1r .-p mjb 5rjin all direct:mb moe8p xt1com1 .-5rj rj:hions 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 frh dpfw,f6 b1q/om a source that is radiating equally in all directions 6 dbf1w,p /fqhis
$6.0 \times 10^{-10} \; W/m^{2}$. 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 assumed to7/.3z rzxr0e*v fqgn r be uniformly distributed in all directions. What iszqzrr30rxv7 fe /g*. n 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 fvk+ 554p7lqq fw;k. xbrbzie:mbvg-;rom a barking dog. What would be the intw kf5berb mvbzvk ;57.q;+qxl gi-4p:ensity 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 from a sound source the xg4 (erobcjnj: +qgfw50e8w.4pb -4d 4 cnuu rintensity 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 in all direction gcjrp5 nu:wjb(.e4 4wcxboeqdun+f4 -48 0g rs.

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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 pointr tjp ;gpha7 xft1kp xtk0;6+( source is 95 dB. At what distance will it be xt ;fjx0kt7ra p6p k;1g (hpt+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 th p-obkqho01o8l6/dwone has a frequency of 1200 Hz. What is the frequency of the fourth harmonwlk-/p ohh01dob8oq 6ic?

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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 leng) xf4r)pebkk *kf4pxbk )r) *eth 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 the 2 akr ,gn,ih k2gd9hrw) d8:kffrequency of the lowest tone that will resonate in an open pknhk,wgradd98h i ,k)2g:rf2 ipe 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 velocithl8a,lc 0 3;r ul4cunwy of sound in air is 340 m/s, what is the fr,38;uncal40 wrhcl ulequency 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 v22(umnk uyaj055 pmlin 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 frequency in a pipe closed at one end is 330 Hz. What is j1j.wv o 3vlib7j,od0the frequency of the thijdwjo7.v j3l, v01b oird 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 will3,l,z/bw kd wy have a fundamental frequl, ,ywd3b /zkwency 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 room where the temp pg -8xmwx,y7gerature 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 thgrskk vlmt 3/azc-bn 2 *p*ry.lx/ 06pe temperature 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 szivi0w qp1bv sc7/0 b4ound in air is 340 m/s. What is the fundamentbb47 s/v1picqiv 00wzal 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 an1 za/zi p3yalowu0 7j8d the other is closed on one end. If the fundamental frequency of t i3 8lo10yajp 7zw/uazhe 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 m t)xazl8c ;y*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 so;yc) xa *8mtzlurces 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 5 /t0fqsp8op.h00 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 other speaker? (The sound hs f o.p8q/t0pspeed 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 frequency?+)tm8nmxo+4w :j55ijb( u sl qmz isll6d:c6o

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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 the frequency of a musical wdc/qp zhlc 408m0*xginstrument. If the tuner he*ld/w mgx0hq80c p4zc ars 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 two horns are 6 m 3vw p2oyo 0a tfa*l4s .u*.reoand 7 m respectively. What beat frequency is heard when the horns are sounded on a day0l2 atas4r*e*pw.o3 .yvu foo 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 orchestra are found to at,l 6t e,cpq5kh3l7l; ;wpkxproduce a beat frequency of 2 Hz when a frequency of 660 Hz is played. What percentage changetq a;tl ,36pp5k, c7;lhkx wle 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 o((4 tmrfo;jdit(f f:sound source at twice the speed of sound. The observer hears a frequency ((:ird oo jf4m;f(tftof

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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( ae nq(yde/w(ph8u+f Hz) approaches a stationary observer at one-half the speed of sound. The observer hears a frequence un+fdpew(qa(y( 8/h y 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 um7p:+ drar7bjnm v*4of 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 ajb+mmu:47rp*7rn v d 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 800-8o 1/k9 pm/i*7,jf8w lksawmsiwv/zkHz siren. It is traveling 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. 91p ,mikj 78f8wssvo* /imalk/wzk /wWhat 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 st)v o1: ylb0v6bzz tckfk-51qmationary observer when a train approaches with a speed of 30 m/s. The frequency zm1c10tv5q :-z yovl6bkkf )b of 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 h8f: rqsb268bh+8k +r p cqkevtoward you at 120 km/h. The train blows its 400-Hz whistle. Take thbkvh 6e88cr:h 8k++ qr2 pbqsfe speed of sound to be 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)cjuex/mq : ctbuh toward a stationary train. The train blows its 400-Hz whistle. Take the speed of sound to be 340 + :h:jx utcec+bqu)m/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 9mcul xm9f vb96v*w6j fca7t0 blows its 400-Hz whistle. Take thmv70 lbvx9*t f jf c6aucm9w96e 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.a+- isl3il ou 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 isi- 3solau+ l.i 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 bxs;t+ )tmqy+j 2:qpmu e6w o6speed of sound in air is 340 m/s. What is the frequency heard by an obse+mjw;:)yb xp mosu t et+66q2qrver 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 airnaftyxhhn h d7 +tmpr2jm9 ;k,m7h-. n.x- ul- is 340 m/s. What is the frequency heard by an observer if the observer is 9h m,kd ht7-h2j x+mp yt.ln 7nh-f ma-ru.nx;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 )cdt*utc. dm9 annw,vcfkr7.:e sc7 , signal is sent out, and a 42-kHz signal is returned. Assume the speed of sound is 345 m/s. Ho:acktrmf)7c9v,dec n, tdn.* c .wus 7w 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 a3n,xe)y e hgmutgm17 g mg;wep( )xm4; 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 half-angle of ,z:/l5 yvhle4;x4cfke2 nv kx the conical shock waven/e5 ex h,;vz4lfvkc24yx: lk 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 fromz+m6(nkxeku)l2y1 kl the United States to Europe with a Mach number of 1.05 where the ae1 2 )(lnml6+ku kyzxkir temperature is $5.0 \; ^{\circ}C$. What is the speed of the plane?

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