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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 statemer -oe1sy7de w;f7kg u(bue:k,nt?

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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 fasum1.0a/lc p-n oa (1lzgeeub: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 in a steel do5ku;9-gsyzp2 c4mb 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, wyeu ff8n9 mfm a8:/gw.hat happens to the velocity of sound? (Assume that all 8w m fyaf.:emgf9nu/8other 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 sound, the veg+nbl 4g2 u0t z+xz40pabh2irlocity of a 200 Hz sound throu2b+ 2n4uz 0b rpzxgih+ 0a4gltgh 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 of a 400 :-have fty2:w Hz sound, the wavelength of a 200 Hz sound ine-2h: fvaytw: 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 frequenc dc3ko-rmqq)mu2an8 .ies 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 less than 20 Hzqv;/q pnv d:b k70xjt zv ;2wbkn)t*4r 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 unify 5 orp9 8hid7(/wqfwdormly in all directions. If you move to a 785qwwpdoy/ r( f9hidpoint 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 diver+g+s.zx rq;kfging waves, 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. What is to/r z2zz4zl.hk: c34df64y z(cpul q khe intensity at a distance 2d from 3zul6k lk4z dychqoz/fzr( 4z. 24:cpthe 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 source that is radiating equally in all d4dw)mmw( :zc(f:n uq virections. What happens to the i(uww()vmznm:f: qcd4 ntensity 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 b5ac,,snlktde:u 0 e*is radiating equally in all dirsud,c5kne, at l0b*e:ections. What 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 as a*b(tjkos:1oy0 q 8rsgyjv0 8v 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 emittinghec mx*m3 n:6f a pure tone. What characteristic of the sounm fm3nhc :xe6*d 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" ofo +mbd-q 7g1we 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 "pitch" of gx/h(d7k*q 9ridm)rj 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 frydz19a g9vx0 izwxevo *9m+7zom 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 q+a5)n syoye )u+ shol)q nrhx1q4l6.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 a4lu 3) 5 zft1timf(lac guitar string and the sound wave generated by the guitar a5utza3tif cm14l( )fls 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 open at both ends, thert(5n 35e d8zh h62qzq8kkpa0yzw 8efxe

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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 are1jl od8hzqejh j r.j jr(p322+ the wavelengths of the three lowest tolr (ojj8je2. zp3qj d1r2+ jhhnes 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 in an open pipe of length L is 200ve i9/b toeo/rds-2.x Hz. Which one of the fir2/ .xost v9bd-e/oeollowing 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 fz. 8 fgeysflx r1imdh9b)x /s3-k,f,u requency. Which statemel us9iks)ry,f.f/8 dxzb 3m1ehgx- f ,nt 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 which is open at one end and cloq.*z0qwh: bhomzeih*4y - d7x6 njd0nsed 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 lenoa 8:d f+-y4pqbh+p(v(g j ryngth L. What are the wavelengths of the three lowest tones producvp+gprbd+8y h4:yjon( -q a(fed 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 resopip p43dy2h zz5:1 2y9qt bkofnate in a closed pipe of length L is 200 Hz. Which of the following frequencies will not resonate inyo9bpipt:d y4qk5h22 p3z1fz 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 cljsrcr+ r 4se3:mwn+rg)2hl f6osed at one end is resonating at its fundamental frequency. Whir:m g32e)rnw4r6s+lhr+sj f cch 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 driven by the same sou-xginefluy.l ) :v0w 1rce. Each speaker produces a -nyu.: )wfeg0i xv1l ltone with a 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 two sound waves should hasia t5 a9ws7:xve

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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 together0syh,uc2 u pgu-kv/b ae.r4i 2 and a particular beat frequency is heard. What happens to the beat frequency if the frequency of one of the toerua0sgcvu/bi p24 -. h yuk2,nes 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 exp5/xiwd q*se j ; z+*nc(izjnv/lains

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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 observeq487 z vy:lsxg*z3z., yyjyg lr. The frequency heard by the obserl4j:gg8z7.yxy zyly qz3,v *s ver 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 depar,yyi8c2u+po dts from a stationary observer. The frequency heard by the observer i,yi2 co8+du pys

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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-v+*e sbdl0 (jtangle will decrease by a fat0 bve *sjd(l+ctor 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 air is 352 mrvs*w k1b/untm;f(, m/s. What is the air temperat,s ;nfm1 wu*/bmt(rkv ure?

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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 souo- vdd9 o7ie qxeg fl)7 5mjvh46+*addnd 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, 34xe v)yyq*,neg 68d*y fwyxc a bat emits a shriek whose echo reaches it 0.0250 s later. How far away was the objqy yev,)y84d 3* xe6cxwny*fgect 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 e 4 ox170q+ sf0lsklkoecho 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 5s: r,te*y qeni4y:gp/ .0 s after seeing a flash of lightning, the distance to the lightning stri:p4s ngyqeyir:* / ,etke 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 dacyi-ogg* sh asz.8,/z t la3s.y 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 andlb ;+eg5qwpdx4g4v5;6vrvn4bbz *gm hear the splash 2.5 s later. How deep is the well? (Iggvbl6nb 5b g rz4dxqm*;ev4 v+p;5g4wnore 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 frequebvps hx (z7ei/tm)8h,ncy 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 air a* m2m*s4)pv eaowa2 vm+x c.vlt $23 \; ^{\circ}C$ 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 iq r47 lhmlu)l)ntensity $10^{-3} \; W/m^{2}$?

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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 e22r- a6pkt kkof 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 intensities of two sounds wi ;4a,(ayz*aah0rj 6oed)zbolth intensity levels of 70 dB and 40 dy a;a,4jzb a ehr0o6 d*(zal)oB?

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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 inteb 1a k6dt7- ovs+p)ywua11rzdnsity level genera1pa17o s kvau16y)-td z+brdwted 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 94kiwlm6 c3nq6.0 m from a source that is radiating equally in all directio ic3mqn496 wklns 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(nx28f u81 wmzuwt:p m radiating equally in all directions nmp (wufx z218:m wtu8is
$6.0 \times 10^{-10} \; W/m^{2}$. 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 ofm;ubjtg6 +x 1 )mdjz .glhe9v9 power, which is assumed to be uniformly distributed in all directions. What is the intensity level at a distance 5.00 m from t+jeg.ulh;9m zb9j g )d6xtvm1he 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 distanxra i qm*kp,os( s k2jn:*+e;mce 5.00 m from a barking dog. What would be the in ne,*:r*sjoi2 kxpskqm+ a;m (tensity 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 :bdm26f0ufag ;7vmqalevel is 60 dB. What is the intensity level (in dB) at :f va;q0d2famu6 7gmba 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 levec ffqj +(lqjl207yhb03qnl0 jl 5.0 m from a point source is 95 dB. At what distance will it be 70l 3 fnjq b+qyljhq0lj( 70fc25 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 fre0(qs q.r cop,equency of 1200 Hz. What is the frequencyso rpqc0(q,e . of the 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 third harmonic of an open pipe is 9hxm1 8c ;ow6rk00 Hz. What is the length of the1ok ;h6wrm 8xc 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 o):1+0szw)diaq qc caszg, o * nkmx,er4;aw4uf length L is 400 Hz. What is the frerwcm01iq*us, kaze;4:z,sq w g4))ona dx +acquency of the lowest 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 p(/xaoref-xv0m-p ;j+.tw v h 0.80 m. If the velocity of sound in air is 340 m/s, what is the frfv;wpa mvph+ jr.-/eox- 0(txequency 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 thmx spdp+a 007l d1f ojyiy90e2e 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 the fd c8ac;1yk9 dwrequency9dy 18dc wcak; 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 have a fund dj).z5ch qz5zamental frequency of 60 Hz on a day when the velocitzqzzhc55jd) .y 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 tyj ge +8cj+7bhhe 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 theudh9.mu 9uxiuqc,,qjkr +g1x 32x1sh 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 l/w*n8uj m6dim is played when the speed of sound in air is 340 m/s. What is the fm*jdu n 6/8wliundamental 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 ofs(rvwk*d 5 o4f8mit-j the same length: one is open and the other is closed on one end. If the fundamental frequency of the open pipe is 3m (kt5f*swj4 v8drio-00 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 800 H5cb)rf;yw0 dfz 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 th0c r5fdf );wbye 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 placed side sjxlu:3x7,)lb )yopzby 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:o3bxy s))7 zxllpj,u 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 Hop lsto(9 fkn6nz*l. 0z 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 tr sz ug+34n2azo tune the frequency of a musical instrument. If the tuner hears a beat freque2nsr gzzua+4 3ncy 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 sla(7 4yhrxxc ,ounds produced by two horns are 6 m and 7 m respectively. What beat frequency is heard when therxh y(47lxa c, 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 vio6 ti26/ ew1otre/fwvk3x7cc t5hmg v -lin strings on two violins 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 strings would bring them to the same frequency?v 1v56wi/t mrt-2k e c hc6w/73gxoeft

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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 sgo51nf0 :m p1ogmby h8ound source at twice the speed of sound po:n5m1yo g18mf0 ghb. 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 frequency of 1000 Hz) approaches a s0tqm/ i*gr s);yk3x9jfub2hlk kgy 42 tationary observer at one-half the 2g x*9 r4kugltsf)h k0iq m;j /y3bky2speed 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 Hzj4cmrp*7 o57e lc r4u 3l. xkufli3fw). If a listener moves with a speed of 30 m/s away from the7o5 j w.r4xu3ku fim3c)clrlpl4* ef7 source, what is the 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 sire4jmec / 5zkp0a pj p,c q0/71j;qhjfbhn. It is traveling at 35 m/s on a day when the speed of sound through air is 340 m01q j ,hp; c fjac7pzbj4/5/mphq0kej/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 train aus wv17aqv,d5 pproaches with a speed of 30 m/s. The frequency ofdv51 aw,uq7s v 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.l1 ll2y. /i6,st irnci The train blows its 400-Hz whistle. Take the speed of sound to be 340 m/s. ciy s2il l1/,it.rl n6What 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/f +mxx yp svyu7knhid 5*7w2k.0x;j3 hh toward a stationary train. The train blows its 400-Hz whistle. Take the speed of sound to be 3yk5hv*uhi0 x +7nsxf7 kjmx2dy3; pw.40 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 bl flz l4z.4xvn2ows its 400-Hz whistle. Take the speed of sound to be 340 m/s. What frequencz.llnf z44v2x y 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 blo:xqah 5b)+brq ws its whistle, and you hear a tone o)q+r axhqb5:bf 400 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 the speed of sound in air is2u mtdix bp gekdn8h)+2;n. q3 340 m/s. What is the frequency heard by an observer if the observer is moving away from the train with a speed o)pdx dn. 3miu2k;+et bg h28nqf 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 air is 34 cns-ofv-a2gnk klt , 7sfu/8x8nue0, t)0iao0 m/s. What is the frns, tkfi00notcnk s8 l/a, x ogu8)-a2- 7fuevequency heard by an observer if the observer is 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 ac8rjg8fz kerz9/. kj-en6fy7 n object. A 40-kHz signal is sent out, zf89ke -zf8 6grnyj re.jk7c/and a 42-kHz signal 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 by a supersonic aircraft jar6 3u,pe+ v.:cmz,( lzoj usis $60^{\circ}$. 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 o e.40g6z.fgk4 np umpif the conical shock wave forui6m pf.0zn e4.4k gpgmed?

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87#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The Concord airplane fw)(go alo2 .rltgu s9 q0gr:c vkm66w3lies from the United States to Europe with a Mach number of 1.05 whereo(ckg9wr r: 3 alt6g0w gu)osv.mq6l2 the air temperature is $5.0 \; ^{\circ}C$. What is the speed of the plane?

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