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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 falseidim g 3 ad*h9k0d.my: 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 fasqh 95 +al,aycktest 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 6 m, mta0lj+gkrod?

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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 velocitxajm+f)n/u dij4ylal; 9() pq y of sound? a/iuqjxljl(y9 dman+)p;)f4(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 of a *hbp sunzw 8 .5 vkagpz+0h;y)400 Hz sound, the velocity of a 200 Hz sound through ainpbgzp)w h;a v+8hu0 y.kz *5sr 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 h5a;7l;2hy hzh9gb02 ur( lh/tb,pckicxp 7 iHz sound, the wavelength of a 200 Hz sound in airg/k hl7th7uc 29h, ;ii ;2(hcxp abzry 05bplh 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 H2a.he t kd1pm*shz2:bz 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; ,nf:tdwyqe -gz9:ur 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 sourceg r4zchf t87pdy7g:q 9 is emitting waves uniformly in all directions. If you move to a poi7gcqdrf: y94p87z h gtnt 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 proportional9kbs7c 1ud .mx 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 smfqk7)qwzmg. o6 ue lv(*;ai+ource at a distance d from the source is I. What is the intensity at a distance 2d from the sour *u)eq ;gm mv+zi7w(kq. olaf6ce?

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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 tha*yptp y3aq 3b .w lg+dg.+seiqh 12dy5t is radiating equally in all directions. What happens to the intensit+q t5.peysa2pw ygb.3 + 3g1dlyqh*idy 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 rd f6fqok,s0 12sgtgmdd6/8 h in all directions. What happens to the intensity level of the sound? /sfo gk g612d tdmsq06, hdr8f 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 a sound becomec5 q ,gfe/+st-)bgav bs 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 c6bck ed-a. m9(mcam1kharacteristic of the sou ek1d(a- 6amckcb.mm9 nd 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 mgz 7mj , r+) kq go08,rcw6bnb8vnhv*jusical 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 musical note? zt)e.5 t(bbtl

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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 int.sbk xpg.55 rbuwt:t*o 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 wave;gvw b vq00bx:s 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 wave generat6 j1j33: ajt,dsrtelzed by the guitar as a result of this vibration. What do these two waves have in common?j3a :dtrzj 61 estlj3,

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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 openfv/fay1j(- b anv.0nr:rx ,g v 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 x7 q./ln52fvuztr- 011e rz v ezqo*zjwavelengths of the three lowest tones producerz etl*1fv ezu5.-jz2v7qxqn 0or1/ z d 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 o ) qz*s6yznfu1 1fnc.a;ncaf,pen pipe of length L is 200 Hz. Which one of the following fr1az).cfnny fn1ufz,sq*c6a; equencies 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 frequency14np4+ b+tgzf/z fmik 76 eoac. Which statement is cc 6fzpe4zoa7 4ib1/k +fg +nmtorrect?

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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 whicep(pj-v 5ydq 6/bmq/w h 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 kzirp twc 4)t9mw5:v3 of length L. What are the wavelengths of the three lowest tonesict5km:z 4v3t w9 rp)w produced 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 in a closed pipe of length L is 200 Hz. W0cur 9of4h3ms hich of the following frequencies will not resonate in that pis04mc ufho9 r3pe?

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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 lxlw/yey/f0p, z*a )oat its fundamental frequency. Which statement is correctex z/a/0*) plwfoy,yl ?

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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 speakef1 (bmltd0 du9r produces a tone with a frequency of 200 Hz on a day when the speed of sound is 330 m/s. The pel f9(0du 1dtmbrson 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 t4wb5at 81pq5wj5td numl)y ij 13 v1mhwo 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 beat frequency is heard. Wnc)i(aud dbzp9b6 (-z hatb) (u6c9izna dz-bpd( happens to the beat frequency 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 explainsstq8fxa:lsl 6o( t 1c56dqu e5

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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 stationarl7) lg q i)2dx90jt h.booa6vcf2u gz8y observer. The frequency heard by the observerlg gz2t lo jxfb68qa cd)voi).2 u9h70 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 sta ,a:v; 3dz tcqh-pk9cntionary observer. The frequency heard by the obsercp vz hk3-ac;9: qn,dtver 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 decreasegjm7 z5 crb,i4 by a fact4gr,b5m7c jzior 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 45 kHz in ai2m7fsydubj6+m y o ;a,r is 352 m/s. What is the air tempf76umj+; syadb, omy2erature?

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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 spgx4z b+s s e;+ xw;znom2)edk1eed 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 bat emits awu3ef/3c),oznr ) x mf shriek whose echo reaches it 0.0250 s o /3,f3rn ewcfuz)xm)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, ana:7 2zcw-vtu zd 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 seeing a flash of *o7o:.f npjsg lightning, the distance to the lightnisf: o*og p.7jnng 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 on a da.a +-ixf vgq 6l4t w:4(d6h2jbc hkwgay 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 2.5 s l ljlw 9y/ut47sater. How deep is the well? (Ignore air resistance, and as lyu 7/ljt4sw9sume 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 s1s u)ykzn 3j zej1hs:7ound wave of frequency 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 ai;qrwb-qbgsg i 8 z1i2(0lc6ec r 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 sound with invycrx a-yg n8s5cz-dk2hx*7 d4akj .7 tensity $10^{-3} \; W/m^{2}$?

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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 s3 +n gjqahw 7l 3r95bb/fnj/glound?

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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 l0 opjgwu10c mm4:c 3yof two sounds with intensity levels of 70 dB and 40 c3 um:j 0py0wgmcl4o1dB?

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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 is the intensity lzx1 8,s0 jfzpgm5.(ygj7 cuzlevel generax, 5y8u jzzg m7sgjpcl(f10z.ted 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 is radiating e(yl wml ls 2f :arc)x+mk)03hvqually in all dirxcyl0:f(+m)arlh sw)l kv 23mections 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 ofi8vm)mbtska 7e 2)3ym 6.0 m from a source that is radiating equally in altimsvymea87 b 3k))2ml directions 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 is assumedqm 1zyq n86c5b to be uniformly distributed in all directions. What is the intensity level at a d5yc1n 6bq8zm qistance 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 barking dog. u*fk:g)d fh)l What would be the intensity leveldflu)*)gf: hk 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 mt5u -9/+6swksa nv tfl 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 e+ua5v-wtsk6f lt / 9nsqually 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. At what disqwpt/mh e*e- n)k g:7rtance wilw*q 7en)-ktm:e/ phg rl 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 1200 Hz. What +q1 (so+i*ngv:ia pkm is the frequency of the fourth hmnaoig1(v*+ p:i +kqs armonic?

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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 i6 ;qft1g/ qxqxwy0+djs 900 Hz. What is the length 6xgd+qqf0w;/ q 1 jxytof 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 o8rg, : u6z3 ytvfj,a8qi1ggjef length L is 400 Hz. What is the frequency of the lowest tone that will resonate in an open pig8i63zuyj arqgv81,:ej, gft pe 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 lecwypi9e yl 6c19kbv:8ngth of 0.80 m. If the velocity of sound in ai1y8k6vy: w c9blpe9ci r is 340 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 a room where the temj4w9w lx8piwuz) ti 3:perature 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 am)zvoo rm/9vz)w,)uuc) y 8zi pipe closed at one end is 330 Hz. What is the frequency oiz wu)c o r/m9zuvm)v8yz)o),f 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 oq 8z; tyfnm-f z;bv07lji6k4that will have a fundamentalynm 8ozb;7ffl ;j4 - qi6kt0zv frequency 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 temper 0(0 cxccs1 2gt)r1r rdus8sgvature 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 temperatuvdvnwe*ggn 2ng+3q ).8( kn fkre 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 sou j:(n,l vv1wmund in air is 340 mnjl u,1m(vw:v /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 and the othee 20 onkvi01djr is closed on one end. If tdekov0n2 1ji 0he 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 frg+91z,keij/** qjkcyk5 yb rss h2,nxequency 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 sous i* kjky2+ *sn1 h,j9exyq kcbzg5r/,rces 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 anph/e7mh8f dm 9d driven by the same frequency of 500 Hz. If the distance from a person to one spe8em /d7 9hfmphaker 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 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 f h3paite0.u,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 the fnevweh59bun75r.2 i3nin r a(requency of a musical instrument. If the tuner hears a beat frequency of 2 Hz, what is t9ni5h7re.r nnu3ba25ew (i nvhe 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 respectiveh):hqs wp )lu kzqn245ly. What beat frequency is heard when the horns are sounded on a day when the velocity u)k )sz5 :lhp42n qqhwof 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 violig -ak tfsfd;ed.c )t9+ns in an orchestra are 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 stt.ds k9fc);tf -ed ga+rings 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 speed yd5d;jg d- ijl 9y6kye4oa-4jof so6;gyj4-a i4j yol5d9kj ddy -eund. The observer 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 frequenc -* oidspabowb.8;c e:y of 1000 Hz) approaches a stationary observer at one-half the speed of sound. The observer hears a frequency o;b.c bo8sepd- oa:i*w f

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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 1000f*pf oz+ iw+f) Hz. If a listener moves with a speed of 30 m/s away from the source, what is the frequency heard by t*+oifw f)zpf+he 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 traveling at 35 m/s on a dayys( fx/3/q v*jqu ch)m when the speed of sou //(ms)yqvfu* hjqx3c nd through air 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 trai+k1 qu ouv*vxo/; vjr1n approaches with a speed of 30 m/s. The frequency of the train horn is 600 Hz and the speed of sounrxvo;uju1 q+1*o v/vkd 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 400-Hz whiut5 ) mhmv5f)hstle. Take thfv)h mht55)mu e 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 12gfbvu j10onnr xli )d,m/laa2f9n 95;0 km/h toward a stationary train. The train blows its 400-Hz whistle. Take the si;a mbvo)fnl1 g5x0 n9ludr 9f n2,aj/peed 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 at 120 km/h. The train blows iq.mo 7y piof5nn7q 46lts 400-Hz whistle. Take the speed of sound to be 340 m/s. What frequ5o pm.yif4oqnn7 76 qlency 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 a(k; ;)12clnqjz hkg ydway from you at 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. Whanc kkhzg l2dq)y(;;1j t 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 the speed of sound in air is 3etnyyd qp8(l/o +8n5s40 m/s. What is the frequency heard by an observer if the observer is moving awayt+pnoq/8e8l 5d(ysyn 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 Hsh+n4k5j,f/o xker/ ebjv3:j z. Assume 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 wib/:joej ,rj5x+e3skk4v nfh/th 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-e0q f;tsa.h 9qkHz signal is sent out, and a 42-kHz signal is returned. Assume the speed of ta0fqesqh9;.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 shkobue8*bl 2 . ggsz7(tock wave produced 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 speed of Mach1fi 3adv- 4wvs( knfv7 1.4. What is the half-angle of the conical shock wave for4w inaf f37vv-v k1(sdmed?

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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 Unitoj(iw5g n+5um 7yw xd0ed States to Europe with a Mach number of 1.05 where the air tempdyu+57ww 0gim ox n(5jerature is $5.0 \; ^{\circ}C$. What is the speed of the plane?

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