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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 j3j61tx l p1bq:vey r)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 fastessia2w/ cvvd9w)zgj .w/,y+ret 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 n2a jy;ne2fs3in 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 velocity of sounwkt ;,3diom+ cd? (Assume that all ot twci3,;o+kmdher 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 sok568xliyty o*f1zr7 xund, the velocity of a 200 Hz sound through aiyyt5*rk8f x 16ox7izl r 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 o08fnr . wihuzpz8, *fqzl6g wp/ bo+m2f a 200 Hz sound in air op8z0lzu8*wqfi h/n.br p6+wzm2, f gis

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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 20,000b+ vgb8*e29 :ewjm:xd9gxwiz 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 lh8le wquy x;l iz* b+j3+x j3bt3(fwiz8a :q-ress 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 is1k 3yid cf3h6l emitting waves uniformly in all directions. If you move to a 6f3c d31ik hlypoint 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, interanxk3y-)rbdqx+tvm9 u+r9+ nsity 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 fro3 v(q8u aqrd 0;czxsy/nk 1q4sm the source is I. What is the intensity at a distance 2d from thkss04ayq;vz1u3dx qc (rq8n/e 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 dista.2ok8lbch 2 atnce from a sound source that is radiating equally in all directions. .halobt8 2 ck2 What happens to 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 a 15ykejm 8pt(ull directions. What happens to the intensity level of tmtk5juy 1p(8e 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 ashz n/ ;qfko)*o 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. 5/t smhlwc9v9 What characteristic of the tc /lvh9s5 9wmsound increases?

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16#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What determines "loudneikq+bv)e.f j3 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 "pil -fc7 s4imb uu/.ed)qtch" 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 b, qtow/c2l tpq/y*ef.ta82o 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 arex z-zzvpjtv:c 3.. +nr

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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 guitp p3fyd;y6s;(ly1(v uixpo+car string and the sound wave generated by the goy3v;dy cpsy(16 ixp lp u(f;+uitar as a result 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 op+tvpmx 8sfm 4nwiyx4 .zbf;c+gh( )0sen 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 wave6zzv qiz3c5j8 lengths of the three lowest tones produced zivz53qc8 jz6by 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 20wc n.q )43 bvdqx g(78cmfjhk 6la11ef0 Hz. Which one of thka c7ecq b1nqwvx1g f. f)346mjlh(8 de following 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 l4ff- xsikv91 frequency. Which statement is corrfv9i f s-4l1kxect?

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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 o jr) e / 5ypob8h;yo80gw5zlvgne 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 9j .di5f bb) a,7q*uoykepoe -length L. What are the wavelengths of the three lowest tones produce-ep 5udeyi k jf9,oa).bo 7b*qd 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. Whice3l6 dmvs7/ wmh of the following freq m emd/63swvl7uencies 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 resmc z -qt)j4o5q6g(cftonating at its fundamental frequency. jqgt-qmcct(o6 )5zf4 Which 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 sp 8 g4qh -4ouzsfg8 cdy,-d7 1h7vbpawpeakers driven by the same source. Each speaker produces a tone with a frequency of 200 Hz on a day when the szgv48p -osw g-7a1u4 qp8h7yfdd,hbc peed 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 soundxi4n6k2 mwq4 w 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 hear 4a9wy(um uc zygjtm2. gyu9 m+ma3f09d. What 2fyauu u jzmyyc 90m+.99tm ga(4mw3ghappens 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 expla h;sei(z9mph7ins

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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 frequef 8pu rwv5a56rncy heard by the observer a68v pu5fw5 rris

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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 f(b; slcgq vilo,8v:6 jrequency heard by the obser:o6gc,b;i8j qvvs l(lver 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 it3-a4z:l3jo1tmelghc9 g ,i u:+zzzdts MACH-speed, its half-angle will decrease by a fact:tmzga1j4h:i gl+ euz3- 9o ,c3dtzzlor 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 ultrasonick*zh vak;l q1/ sound of frequency 45 kHz in air is 352 m/s. What is the lh1a*/kzvk; qair 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 tlb j,k7,u lbq4; 8ft1jlnhx rj+o(2h 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 speo+ ; hsibp4e0 c(r8sjoed of sound in air is 340 m/s, a bat emits a shriek whose echo reaches it +ho b8p40 (oe;rissc j0.0250 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, and hear the echo2 d kslkni;aps fm r:.8kr+y-4 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 i evv/g e(p8+llightning, the distance to the lightning strike is ab vge(ivp /8e+lout

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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 clifu:kan0-w j1; lc +iqz-ag8wo uf on a day 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 later. Howcwe)bd 3q ;2mil4-e0- ;wg 9xqqoqplx deep is the well? (Ignore air resistance, an9-qm4q-x;oqwllb gx)qi 3d02wc eep ;d 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 500 o,l,f(yqayx / 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 dcl )ejr;n5k +$23 \; ^{\circ}C$ 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 s8lojzpw,erz8j4 d ;7j ound 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 sou,mkhf;2c 3xi o :bwf/ji0gs4 hnd?

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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 with u o6w/ixi-h v5te/ iud+6( vtpintensity levels of 70 dB andd 6tt/-e p+iw6 v /iihv(xo5uu 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 bew 0py8 jf35vyy 15 engines in a garage is 100 dB. What is the intensity level generated by one engwepyjf85yv 03ine?

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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 ab5cx:l-hxi pca5r4i-qv 0z7 of 6.0 m from a source that is radiating equally in iqhr acbcpx 5lx: -4-va5zi7 0all directions 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 source that is k(k8 dvl-* ajefhi(7h radiating equally in all (lvejhkh i(f7 k8-d* adirections 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 assumed to be uniformly4cduci .4aw mh/p 7lh- distributed in all directions. What is the in4-cw4id h/mu c.lp7hatensity 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 a vd :fwet:l u 6r(9jck jz)8mu/ezs5)qt a distance 5.00 m from a barking dog. What would be the iuf5 qmz6zkv: 9t) scdr8u:jjeel/( )wntensity 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 intensity level is 60 dB. Whk4s c,-v st+e7:ea ssl nfkz*-at is the intensity level (in dB) at a point 2.0 m from the source? Assume that the source radiates equally in a:ls4sks7n -f, csaketv+e*-z ll 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 f6dktmyb 1d) :qp6t8rr rom a point source is 95 dB. At what distance will it be 75 dBqtyd1 r d )p6r:86kmtb?

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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)euv 7p z(vtk6 a frequency of 1200 Hz. What is the frequency of the fourth harm(zu6pv vet k7)onic?

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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. 3drny yk-6zsrq k-d/ rld- xp54 k1.yj What is the length of yk xlk1d.4sr djndr -k3-qz y-/p6y5rthe 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 lengtwkm-+2 xsknr d* tt5z3da s9t;4qln 1ih L is 400 Hz. What is the frequency of the lowest tone thkkmzn d9qt4lasn3wdt* r25st 1x i +;-at 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 lengthgk z)g*kwp -l2qm)qmox;;fq10* kss k of 0.80 m. If the velocity of sound in air is 340 m/s, what is the frequency of the w2 oq)k s1*qp;;xm sq* mkgzf)gk0l-ksecond 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 t z2,k 7letfacr u(,1kroom 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 sam5o-q s6 ypxlll+;6one end is 330 Hz. What is the frequency s6 sl; -y+a5xopmql6l 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 that will hav;z8q 7tk bos2ie a fundamental frequency of 60 Hz on a b t2kzq o7i;s8day 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 thgp3edtv4,l dj8 hcscw q9k6a2:,sc (o e temperature 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 temperatureys9) c9 ; , 3oq l*xuj9x)mgms*tbgwnm 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 a5y uu c,j/t ej /s*dl,:d; qw,lqvrit,ir is 340 m/s. What is the ft*5dt/ji ew,, q :sj,,ql;yu /vdrlucundamental 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 ofz is *doo7m5p5th+u )o the same length: one is open and the other is closed on one end. If the fundamental frequency of the open pipe is 300 Hz, what isms+5o7z oho*u) dp5 ti 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 eac ve9bn :ato. hr/ j,1zo8t.8t lwo-parh emit a frequency 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 soub o8e vraaw.zlr,p t1 not8.t-j9h/:o 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 b ic(p5dl no79i j.y w..v:p-jlgay 0icy side and driven by the same frequency of 500 Hz. If the di.7.adi j g(oy0lc:vp.ii w95jlpc ny-stance 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 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 freque rlzhi1;tbem48o5 j. q5dk5b lncies of 440 Hz and 444 Hz. 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 t0ij5u)p s j8chamu22eune the frequency of a musical instrument. If the tuner hears a beat frequency of c805i)uujjs2 ma2h ep 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 produ mp9w : i2ajoultbw;7fas0k4/ ced by two horns are 6 m and 7 m respectively. What beat frequency is heard when the horns are sounded on a daf7w0mk ij;lawt: a29 /4posu by 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 p;lptom 4ws.1 orchestra are found to produce a beat frequency of 2 Hz when a frequency of 660 Hz is played. What percentage change in th1swp4t.lp ;ome 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 stati7n zddme50.ka onary 1000-Hz sound source at twice the speed of sound. The observer hears a frequenck0.admd5nz 7e y 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) approacvisx:5dekc1 ss i1pgbnj 6 /*(hes a stationary observer at:issn 1/j61cv*sbp(5kdexi g 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 frequency of 1000 Hz. If a lyly yst3on s.(35nrf5 istener moves with a speed of 30 m/s away from the source, what is the frequency hyt no35 3yrl(f5n.ssyeard 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 traveling at 35 2s/v 6q0frf6jcg 8grrm/s on a day when the speed of rj6qc6/8g 2 rfrfvsg0sound 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 station1j -ja*8bqyg nary observer when a train approaches with a speed of 30 m/s. The frequency of the train horn is 60b- ygj8n1aj q*0 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 blow*xax fn3pop7y a-:3wms its 400-Hz whistle. Take the speed o nypawapx3 *ox:f7-3mf 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-irbj;rtzwx n,: m 7f2/h toward a stationary train. The train blows its 400-Hz whistle. r2r7,n-jmtfb ;i: xwz Take the speed 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 tra0iencf- ;8-cmerno(yg rv,q+in blows its 400-Hz whistle. Take the speed of sound to be 340 m/s. 8 eynvnm( +r,; -qe- cricf0goWhat 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)e* w55askfl p 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 is the actual frequency af5lwps*)5e k 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 5*5/sy2e+z c o (cbjhhb00 Hz. Assume the speed of sound in air is 340o *j+ byb/zs c(chhe52 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. Assume the speed of souo a4 oie1hde4,nd in air is 340 m/s. What is the frequency heard by an observer if the observer is approaching the train eeo,44ho1ida 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 oe*4,( pvv :nd j2rlm s drpw yunuq-1)dk5v(y2f an object. A 40-kHz signal is sent out, and a 42-kHz signal is returned. Assume the speedyl-vn4rn(2,)uwe1rd jd y2u*k : pvqpd msv(5 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)c u7,i xysai0 0r6bnt conical shock 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 speedss-v e( 30t rbgwsxs;,r 5v-sb of Mach 1.4. What is the half-angle of the conical shock wave ss-rs( ,- 0b5bet3rwx vgs;vsformed?

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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 tj2hxt5waot(.9p+e)mq oly n 95 bo+c ihe United States to Europe with a Mach number of 1.05 where the air temperature is ttyq99.(cx2ml ob+5ia)wh5 e+npjo o$5.0 \; ^{\circ}C$. What is the speed of the plane?

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