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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 statem*hu(s jx9q hs8-ds w.uent?

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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 fbjlp-pcx26ozk 1ot 2*astest 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 ro8 1(ezyac+g wed?

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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 yv i270xtfp -uthe air increases, what happens to the velocity of sound? (Assume tha7u-vxyf t p0i2t 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,5zfq1xftb ,jxm+ik* ezl +( a 400 Hz sound, the velocity of a 200 Hz sound through aie+,z( ,*a5z1kt x+ifjmqlxbfr 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 wavelength of a 2,5h law31x eas00 Hz sound i h s1e3a,wlx5an air 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 20,000 Hz are z;it* 8:uwo pjcalled

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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 c3wkao3.oo ; 0 -vmvk.hcza0 voalled

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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 c8e8)av :9 qn tsfst2jsource is emitting waves uniformly in all directions. If you move to a point twice as far away from the source, the9tf)evjc28 8:s asn tq 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, xdl+( e2 ssqg3intensity 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 Ik8yu bg -u/i0ge56ofb94x lel . What is the intensity at a distance 2d from the sourlgob6- kxu4e/90g58eu il byfce?

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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 radiating equalx1)f km;vq,zfh f(kf9*k 2p xyly in all directions. What happens to the intensity of the sound? It reduces tof1q 9 ,f kz pkxmf(y;xh)f*v2k

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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 e9j5nyoql . f2p-. akzrqually in all directions. What happens to the inl 9.k -2p q.fayzjro5ntensity 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 incrx d yw0m*9/sewsm7;smf9m :w oeases 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 emitting a pure tone. What characteristic of4q4o gp r, n:h .buli4u+r5kdb the sound increashlour :4+ bkrdp.n4u 4 bq,ig5es?

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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 musical3tm6 ts, phdny dr,o** 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 ,wndf6 1q m.q9imm g.amusical 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 in908 fifqjklt9*(fry.on na,y to water

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19#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Pressure and displacea*6szu5iqm lw +/9fz jment 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 sound hji6 7 ( caz6jmmouz0cn 55d7ozcz/t 6wave generated by the guitar as a resul/ j imc0 6um576 zhooca7tz(6dn5zcj zt of 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 which is open at both ends, t8feo.blh(l +dhere

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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 wavelengti,)3c .dsolpim,g( a bhs of the three lowest toneb acp.gl (),3m,isdi os produced 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 infgckky5 /yl . (lsu ivls0)7 mz;a*kif.l6n-u an open pipe of length L is 200 Hz. Which one of the following frequ ysgi.( lu6m ;kkcz/u5*yf l -vai)klf 0s.ln7encies 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 fund0a v -kw,kz 2lo;no7sgkti-h;:*ef lkamental frequency. Which stateme7;-f l,k; ak o0t 2*lswvi-:kokngzhent 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 w/otq8n ln:6rb zrjo +2hich 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 wavelengths of the three l ,w) ui-oqcw6zowest tones produced by this pi-o qc,wuw6 zi)pe?

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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 07fu7,im1gm6ftpx am a closed pipe of length L is 200 Hz. Which of the follow7ug, 7m ft6fmp10 aixming 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 fundamental frequen ;1 hz5 n:caha4+gippmcy. Waa+cmh ng; z451piph :hich statement 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 driu hh 7*pcfjko45 g9iq.ven by the same source. Each speaker produces a tone with a pu9fchh7 .q45*kgj io 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, tf)gx4neu 1g1fhe 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 s9z3i zyz, t:in3puy+a particular beat frequency is heard. What happens to the beat frequp : nyu3z zi9sty3+i,zency 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 expz1bew :x4+fq)c9yv ;shc-grvlains

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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 byz j1hbhb:l0d6 d2 kym: the observerm hhd z2:6yjb1b0: kld 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 observ ,u7hnml yk/i*.j9cj;aj;tq fer. The frequency heard by the observk q7jj;f un9tam .hjc,*i/ y;ler 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*(-,rt tixzf gw 8efk9 its MACH-speed, its half-angle will decrease by a fackiwftg(t9z- x 8,er *ftor 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 4 :rob(7ldwj) i5 kHz in air is 352 m/s. What is the air temperature?(j wob) r:7ild

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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 sdm/ u o(t4xn8 bsv+oq)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 a.bxew7 g zq fyg1g1;q-m5es)kir is 340 m/s, a bat emits a shriek whose echox5kq1q.z -1gw;b7sm) efgeyg reaches it 0.0250 s later. How far away 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 cliff,/ c0dvzn2 fly8 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 s after se-m1x,tbmu j 1qeing a flash of lightning, the distance to the lightning strike is abouqu1-m ,mx1t bjt

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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 temperature is .o*sx(i .c 7wsmz6y*r)zdhe h$15 \; ^{\circ}C$. 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 h9 3p clcx.t8cpear the splash 2.5 s later. How deep is the w l8pccct.9 px3ell? (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 kzc7dco5 ohyml v-n5kr.. m0/7c(ph m500 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 airxvxo3*:u-tt e 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 intensityu3j-e mq7px m -,bnhm4 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-dB sos ra/ er8-ktmu-a l:)kund?

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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 intensitic0fkp e0)*s zlhmh5z* es of two sounds with intensity levels of 70 dB and 40 dB? p5mhf00*ez*k)zs hc l

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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. kgfdr/vgflcbq5zw;6v5u0(; k4n0g,z s3u kgWhat is the intensity level gkn( q5fgv6k;lczgw u u 00f /vg 43z;brdsk,5generated 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 -w,9ioip xt5bj s4jsz/lli ic1 +y5t6is radiating equally in all ditji -zl / i95 5+xiisyl4b1ops6 w,tcjrections 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 distae mes /nqa.k.1nce of 6.0 m from a source that is radiating equally in all directionssnee1ak./ qm . 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, which gdm(*cm/uvq od2wq 29is assumed to be uniformly distribut2mqdqd(wgv uo /9*m2ced in all directions. 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.b-jg;ivl(sv jd+ 5cc)00 m from a barking dog. What would be the intensity level if two identical dogs very close to each od- j cvij ;5+gvsbl()cther 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 so+va /zek2l5 2pn/:x rx a(vfgzund source the intensity level is 60 dB. What is the intensity level (in dB) at a point 2.0 m from the source?( p2fr52xkl n+:zagxa//zvev 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.x )a/yfw,d 0db0 m from a point source is 95 dB. At what distance db wf0/xya) ,dwill it be 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 frequency of jxtf c73vagf*rb /,x61200 Hz. What is the frequency of a x7 g/3tj, 6xvc*brffthe 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 thqd9brs cu+/.s(lm4dv qkz,k +ird harmonic of an open pipe is 900 Hz. What is the length of the pipe?+s9klc.b4+/d r(qdqk u, mzvs

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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 L3ok .b-vhq;o u is 400 Hz. What is the frequency of the loweub 3;ovqko-h.st 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 velocila 1*(;1e e gu8flok 3oaz-ddhty of sound in air is 340 m/s, what is the frequency of thef uald*e;ek1glh(z38d -oao1 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 int d*qox6uy +ig+(2 zua 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 en*d jh)m r70zmg ow6,tzd is 330 Hz. What is the frequency of the third h0,jomdgzwr7 )*z6hmt armonic?

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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 funne)cq n0z,h ht;-y d0j-cpx jz9qy-m2damental frequency of 6hy9q 2 tj0)qmpzn--xj; cenhc,z-dy 00 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 tempezui s;ls;84 a;ct7t.* +hwybd*wlptmrature 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 tq28f,jmyb )v/ a+ nbpshe 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 sound in aiau7 1y-7vhn suhl56 mcr is 340 m/s. What i6 navuyum1s57hlc-h 7s 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 saml:++nofw::h d v:hz5b5isw i kkvq*h, e length: one is open and the other is closed on one end. If the fundamental frequency of the open pipe is 300 Hz, what is the fundamentvk+nf hd *q:i5ww::,+bh: h5s zvlkio al 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 the velovvait lqj-maj,+ 13n1 city of sound is 340 m/s. How much farther back would source 1 have to be moved so an observer in front of tji, 1 m-ajqtl+1vavn 3he 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 place7n,b0hj*yb g ud side by 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 no sound, which of the following is a possible the distance from the person to the other speaker? (The sound hy ,n*jgbub07 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 i-tp,i4xg2h9lo) re)g(e shae:c a )tthe 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 tu,8 5s/jdgvcgc ek+ct 2ne the frequency of a musical instrument. If the tuner hears a beat frequency of 2 Hz, what is the j/2s8 5kdcgv+ ,cgcte 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 are5/r:0r uwcsfi 6 m and 7 m respectively. What beat frequency is heard when the horns are soundir5fus0 /:crwed 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 orchestra ar6x3:oko xhvn8/ t lbg/p*v,mo)z9emje found to produce 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 woullxpm: txh3kjgooemo6 /v, 98 v *bn)z/d 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 the5t 4in ) k lgk(3zwg(y2tj(pss speed of sound. The observer ngi(s 4 lkt2)p kwgj((y5zs3thears 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 100x-s dvqwio4 (y 5(bpf-0 Hz) approaches a stationary observer at one-half the speed of sound. The obfi -p(dw- q 5(sxyvb4oserver 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 frequency of 1000 Hz. If a listener moves with a speed of 30 m/s 8owcp )d vsd):8gbn+s away from the source, what is the frequency heard by the observn8pd s)gc8b :)swd ov+er? (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 whenh.p beqb3 n5f91bam 3g the speed of sound through air is 340 m/s. The car approaches and passes an observer who is standing along the ro9abe1h .pf qbg53nm3badside. 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 train appro 0g9ttl1(/n+tp hc hqtaches with a speed of 30 m/s. gc0/nt9t h pl+qh(1t t The frequency 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 toward you at 120 km/h. The t*z yw-eu/wjv)h2dg6b)e)zny2z0yy e m49icl rain blows its 400-Hz whistle. Take the speed of2 zz04l d/ew ))9yy2-ciy g w )v*zebnejumh6y 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 toward a stationary train. The train blows vgos0+ngvt/3 its 400-Hz whistle. Take the speed of sound to be 340 m/s. What frequency do ytnv3gs +o0v/ gou 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 400-Hgsa , p9cho0l:pu/b8f apk40u z whistle. Take the speed of sound to be 340 m/s, g/ 0suo0k cb:9fuphapl48pa . 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 b7..*/uno w,auckauk kt2h f:hlows its whistle, and you hear a tone of 400 hwktckf*. 7uho/2 .n:ua au,k Hz. Take the speed of sound 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 horn is 500 Hz. Assume th +bia-m d ja ,zn1xc07eg.tx:ne speed of sound in air is 340gez,nnmi 0.xtaxb+c7d 1 -aj: 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 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. Assumtzopl 62-t t:qe the speed of sound in air is 340 m/s. What is the frequency heard by an observer if the observer is approaching the train witq6-ol:tp 2ttz h 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 40y0w2vra qqu5hd+w blqm+ h 1d,r(5 h.y-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 dhqr+w 5b5,2q1w.lmq y h uy0ad(h+rv 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 produce um;d+z9:ql chd 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 speu9. c 3lwb9*uzfc e8vzed of Mach 1.4. What is the half-angle of the conical shock c83 f v*b99ezc .zuulwwave 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 United States nc6u ,6okcitffg,p--ix r5 w5to Europe with a Mach number of 1.05 where the air temperatuc 5-x6urg fipo6-f ntw5,c ,ikre is $5.0 \; ^{\circ}C$. What is the speed of the plane?

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