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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 az9h 5 9uq9 kqym+r9noh false 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 f*h lrhvp3:ga;.7mdhx 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 48wnt b k5lq*jky4k)m in 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 sk:hfelg1p p8;ound? (Assume that all other facepg 1k ph8;l:ftors 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 b7o2wvdzm 9q+ Hz sound through a 2v9zqbdwo7 m+ir 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 wavelgfo4trw 3yegl tc .;zo *** ;mg2.wqvdength of a 200 Hz sound iyq4vrg tc* f.z2.wgo dmgo*3;;ewtl*n 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 frequenci9kr20 a( 9anopl4.dt)n4ka w rh0bb xjes 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 less3k dm9/4hlkfb/*orc86fa m;*p,dbl(f v jx lq 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 ww1aplohp vzn385*+d zaves uniformly in all directions. If you move to a point twice as far away from the source,no5zwpl1*ph8+3dz va 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 wavr0rs 6yq;v0c ac okyi7ie*f0 /es, intensity 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 I. Whmqud6 dsdz;7 t)70m dwat is the intensity at a distance 2d from the sourm7;6d d)dud 70zwqtsm ce?

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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 equally i vo*bki+:udv, ;hib;/1 gsa oin all directions. What happens tsib:*,+vv koi ;1dio ahg/b u;o 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 e2-u*iq)(wktk s pex4pqually in all directions. What happens to the intensity level of tw4ukq t p*-ix)e( kps2he 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 a sound becomes l qnhks9und. 5lr1.q s6ouder?

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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 speak.5fgamrj6 7vvw6oo g :er emitting a pure tone. What characteristic of the s o7.56jfg a6mvo wvgr:ound 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 notew,j a*aahol.v:)*t qe ?

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17#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What determines the "pix) k2mrt* g*oqtch" 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 fro7 tc/o-zy3cb sm air 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 (s9 vr:kk)cvw *saw+cwaves 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 ses9:-je;tnk 4iv8yw qound wave generated by the guitar as a resuq4ki sye-vj nw8t9e:;lt 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 bothb8mhc -ong 4m5 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 twmz8* dg2dgbh4*pu- vycw.8 of length L. What are the wavelengths of the three lowest tones produced b.chwgdt m-*8 dypg82 v4wz* uby 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 lengg kx-ry9 qjtc5ps04*.u. g nbeth L is 200 Hz. Which one of th g p9jbsku.c.t r 0x*5qgny-4ee 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 frequency. Whqwyedte k0(djm-: 8 :g(d1xxnich statement is cod j(-wxy e8:k dgq0emtn:x(d1rrect?

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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 vx 2cht5a j0/abf */esis 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 7hlud3-mqdxlk- .g fi s.5bv9x+jh- i wavelengths of the three lowest tones produced by thiu+-k9jqi xx b-d 5 fsgh7v-mllh.d3i.s 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 20m/ x)du *rnww20 Hz. Which of the following freq w2/mr*x)dnuw uencies 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 resonatbo2scz w)ku)c;lig1)ing at its fundamental frequency. Which kio scl2gwz) u)c;) 1bstatement 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 bj+ piob qgk :3w)ogi5:y the same source. Each speaker produces a tone with agi:)ki +qp bj :oogw35 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, the twj9u-cf cya z:jcl(k fr8j:27 mo 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 0/cdzt514edh i0yhvc a particular beat frequency is heard. What happens to the beat frequency if the frequency of 0 01dd/c hz5hitc 4yveone 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*c ip5)g65 drv( ksauiins

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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 f/,h jgpa -z 1jud5p2eby the observ/1 5h fdjgjpe z2,uap-er 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 st .)dcf2:y1h,lx5*r )vzmoi a x /dnbndationary observer. The frequency heard by the obsexi dv5a:hx,)dn.o/cy ldzfn *r m )21brver 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 t.5 f ,nqwvalof hc*2kqh8rq4 :tsuc+)o double its MACH-speed, its half-angle will decrease by a a k t)w5cl hrnfuvq: hs*2c8+4ofqq.,factor 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 s; u wpfx0lmn;s4 n87vlound of frequency 45 kHz in air is 352 m/s. What is the air tempeum7f x lvnw0;p ns;48lrature?

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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 airj zt u1.d4iw51uzgg1o( lis/g 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, i9u(e yn8xts e7pl2bb8if6k6a bat emits a shriek whose echo reaches it 0.0250 s later. How far away was the object y 6b 68(uii8efx lkpb9t2ns7ethat 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, ah55xu bbmrq0, ; .mu )rbeyc3 xs(ic-mnd 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 seein9 budi2g*;qucg a flash of lightning, the distance to the lig*ugubcq d9; 2ihtning 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 4:x zy3hom b di ((uu) *aiv.lk)p*jrcon 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 r) mvb;)uiy8 va deep well and hear the splash 2.5 s later. How deep is the well? (Ignore air resistance, and assume the velocity of sound is 34 bri8vv; ))myu0 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 ff6c7t msxc +(bc /nrm2requency 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 aij+x rul0po1). o4cepur 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 4 lnwb4ywps( 9intensity $10^{-3} \; W/m^{2}$?

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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 7lzc is (bp-,oir fdr8)1 rzy8uz,0( tf0-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 inwsdk)n +5 -s92mxeew stensities of two sounds with intensity levels of 70 dB and 40 dB? n+-d 9wxs)ese25m skw

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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 garagezyxjp c6.p+( 4b x8bne is 100 dB. What is the intensity 4 czepn.byx8 x( p6b+jlevel generated 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 i8vi1afr3y mj 2d c38yzs radiating equally in all dirj8dcz i r383aymyv21fections 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 fromc gw/qkin 4)(i/6oy jl a source that is radiating equally in all direct 4n/y ko/l)( q6gijwicions 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 f4z3bd1c 6 xz8nui )kjuniformly distributed in all directions. What is the intensity levfci8631jbknz 4 d u)zxel 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 from a barking d2yp96cz9.n5 qc zy2k 2z,p- efwhp aisog. What would be the intensity l 2zszcwyh5ka-fz.pe pqc926y ,9inp2evel 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. What uq4ygr2c/ k9f ck 8 mtn -5ev1v1:tzmlis the intensity level (ml ecv ufmzyt ng1vc t:19kq-5842 rk/in dB) at a point 2.0 m from the source? 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 5.0 m from a point mw:zrmx:8 rqseb3b,3*f5c;(r79m m rtji j uosource is 95 dB. At what distance will it t(iw rrj8,9o 3mrzum mb:;73smx ec:*qrb 5fjbe 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. What5b 713xecc bew is the frequency of the fourth h57 bexccw3 eb1armonic?

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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 harmonbkwf)-du4 j kful0 n /b-;zlk*b mw6(zic of an open pipe is 900 Hz. What is the length of the pipezd*-mf /b-wzbl(k)fkw l;6 knb4j u 0u?

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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 lee(wdgll n237ength L is 400 Hz. What is the frequency of the lowest tone that will resonate in an open pipe 27g3 ew ledln(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 velocitys.gl s:)hng) b6y6kwx of sound in air is 3 )yngl:6 6wb. xgsshk)40 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 3/ 6*ac cvl9edxzr r kuv 1-ogm*nb4l,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 piy s *o79eohhomo(8a (ype closed at one end is 330 Hz. What is the frequency of the third harmonyoo om(h o8(y ea*h79sic?

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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 pip*/*anfnfme.f e closed on one end that will have a fundamental am.ff **fnen /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 r7ezek*:v d h+zv:/mqtemperature 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 wher2x;:necpur xq,4e 5a py/rb5ye the 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 0.7ooocw y8- g(f,xgn+cs2a( * hs5 m is played when the speed of sound in air is 340 m/s. What is the xs+(os -cwfagncoy*( g2ho8,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: ife:9 .bgii7xone is open and the other is closed on one end. If the fundamental frequency of the open pip ieibx :.f7g9ie 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 ea45/ t hxivi*40 tyqlylch 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 sources would hear no sounx4iv5qt/h i*y 0yt4lld?

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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/57nh v . 6pfwkde n)o*6adthay side and driven by the same frequency of 500 Hz. If the distance from a person to one speaker is 5.00 m atfdenahw/o66aphkd.n7 v* 5 )nd 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 and2p5pho epq4zja: 2w; sfj2k+j 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 tune *kqqmrsd m4tu/ts/-4 the frequency of a musical instrument. If the tuner hears a beat frequemk r4dsus-q/4/* ttmqncy 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 .x :lm 7v,iqd,x )rmt43+iu1ls jnyassounds produced by two horns are 6 m and 7 m respectively. What beat frequency is h4l rd3)q,n7js i1ix ,:a .myuxm+ tlsveard 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 violins8zpoj fj81; xe in an orchestra are found to produce a beat frequency of 2 Hz when a frequency of 660 Hz is played. What percentj8xf 81jez;op age 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 at twice the speed of .,(7mey mg4/3aqgo cbbk 8 e5g9ncot fsound. The observer he.eon ok59gq8emfy3c7 mgc/(4tbgb , a ars 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 stationary observer ayd fh* n:6e,3vw.yo rou 3vx0gt one-half the speed of sound. The observer hears a frequency o6yg0:,feu yo 33owhvdx* rv .nf

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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 ofqbd:o)- a 3ko(u*y bde7bjzz. 30 m/s away from the source, what is the*eo-d:bd(a) b zjuyo q7z.b3k 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 traveling at 35 m/s o4ml)u 74v ;to (ygwiz mx;mnm8n a day when the speed of sound throughw x;y4um;m7tv zn4 )ogmm(li 8 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 observe c*r qm;d(zsc6r when a train approaches with a speed of mzs r qd6cc;(*30 m/s. 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 train blows its 400-Hz whistlh0iq uo)3og w0l2y.y he. Take the speed of sound to be 340 m/s. Wh .oqho3uwyl00yg )ih2at 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 statioj,1iv(a ,nyc (xf(f vfnary train. The train blows its 400-Hz whistle. Take the speed of sound to be 34( (fnv(,y ,fifcxjav1 0 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 its 400c6yk 7p 8nj5-dm3zzq o-Hz whistle. Take the speed of sound to be 340 m/s. What fre jcn5zzm - oy38qdk76pquency 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. Io48y;l)tgmdiviy-t b6by9e d,3xjsu*r 1 f o,t 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 frequencyb8buy-,;4 t) s*39vd1diyexy mio ,jlfor6gt 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 spe+ikmmr2hd 2f3ft . oa2ed of sound in air is 340 m/s. What is the frequency heard 2rd3 oah .2mffit2 km+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 5y3mf*1 j a5ps hvti8fh.m-a 7z00 Hz. 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 train7h5m1a *m3- 8a hpvtjf.fiz sy 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 six4ulc e47r;vq0o ,l rbgnal is sent out, and a 42-kHz signurl4,r0 lveocq4 b7 ;xal is returned. Assume the speed 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 bld-4x /b7k fk27- onm:ihex 9 uxf/ioyy 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 Mach 1.4. What is the half-angle of the cod7/o xl mxf+ww+rll-*nical shock wol++ - /lxf*rdl7xwmwave 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 Unbr 4 .dxlci;k3mza+kp r+b/z/ited States to Europe with a Mach number of 1.05 where the air4dlbk; p b3 z.crrm/ z+k/i+ax temperature is $5.0 \; ^{\circ}C$. What is the speed of the plane?

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