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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 state;f*ee ek+ n: yaf8e.w *7jxkvsment?

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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 fastest tx, n5jntgym 9iq;ye)rj700zg hrough

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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 pcv; ;non z7)msteel 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 in(oq ,d)xxg:jpcreases, what happens to the velocity of sound? (Assume that all other factors remd q,xgo(:)xjpain 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 so ,bv 5.42awnftwf(ou6yx 3igs5 rw4 fsund, the velocity of a 200 Hz sound through air i56i f t(g rf5vwafs.w2 43xuwnbosy4,s

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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 wavel,y wwg2n)e(hjj /pl;t0z wxr 0ength of a 200 Hz sound in ai(n p/w;t h0 2,)wjygrwj 0xzler 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 20,0iujv1il 6a c;:00 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 wit4yr;qv1j aia ;h frequency less 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 hgfzi-ei /u 6cv+v9vs(ke 2p+waves uniformly in all directions. If you move to a point twic- v/zekh e c+( upv9s6+viif2ge 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 proportional etmthald/* +vwgh9h5vj -92 yto

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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. W ce6; vpk(b/, y t,ujbqa.owr(hat is the intensity at a e v6oqb r;.wu,a/(c(ykj tp ,bdistance 2d from the 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 e5siau.f u n gpo:+e4; ciz6ag0qually in all directi 5u06goaef4pcng . ia;+s: uzions. 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 equal,0u20zoiqv5 m plav0;ueo le: ;o0oo;tt* shlly in all directions. What happens to the intensityoo;m; i005e*tv:vo0uual h o p o2,qzl0t ;les 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 sound7nib;v79b spl 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 characterist0glkka(q5so(0ks /ba ic of the soul(0 (k5o gaaqb/ks0 ksnd 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 5ypmwidye r 2e65a,l: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 a mmmrr*p/j6 i *jfa6* knusical 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 wd:vfoegp 702 e:yq-riater

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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 a25j a;0twvr rtx m1w45edk p,ure

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20#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider the standingsx,s 9c,z/v q )/ habio.won;f wave on a guitar string and the sound wave generated by the guitar as a result of this vibration. What do these svcwbo ),n h;a9 zi.ofq/x,s/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 +sxq s- sdjq9fxyj*m)71 y;cs, 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 wavelengths of the thr0ufwr(u. ho2u ee lowest tones produced by this pipe.owu( uf2rhu0 ?

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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 i5jg/ x yhbub 0nm,. co78mzj(sfzt5/ln an open pipe of length L is 200 Hz. Which one of the following frequencies will not resonate in the sgsy7./l tbm0j/j,m 8h5zn(o zc5bufx ame 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 fr z,tph+i+-al8yb6uer(m / ccw .aow7 uequency. Which statement is cowb7r+w- (acou 6cz8/l + ephi u,aym.trrect?

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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 closed at the o7o oo2r/eah+cxn e,z7ther, 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+*o/ h,fmif (fw -3okdw auf(;yja1kb three lowest tow k(kjw3f f+*m/a-a uoh(1f d ,;ofyibnes 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 resol n/jd1e)ksnnx+3qc /nate in a closed pipe of length L is 200 Hz. Which of the following frequencies will not resonates 3l/n1cdjn/eq) nk+x 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 m-poib .9ab b;fundamental frequency. Whic.o ab-i; pbb9mh 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 source. Each speakq4pi1jy ec na n.bw.e,-k:-z wer produces a tone with a frequency of 200 Hz on a daep-ye nc.k- anq. 1w,j:ibw4zy 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, th 6s+ifnwcbqq8+- wya;e 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 a particular beat xv ur.u, l-w)6 a6vg:ckixr l8twb:l5 frequency is heard. What happens to the beat frequency if the frequency of one of the ll)ub 6v:ar-lxwvr 8 gt5,uxc.k:i w6 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 exc5t,0 cdsyphlcq ) -(z/ra pn,plains

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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 by t3epbwu9 : y4 a9b4oouc(6 ezuhhe obser69:eubu 4a u 9z4yo3(wbepch over 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 observer. The frequency hnu v es*4wh/e7 s60oi k7vpsp4eard by the o4 ss7es u/ki70pw4nv6*v ophebserver 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 wil:u4qtmr mtf2jkq9pto , xet (75 )unx7l decrease by a factorq 7t mp q7r5okftx t:u)ue(mt,9nxj24 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 v 6t *b*fq gfdirmon)aj7 )n1(m/s. What is thefn 7(*brno1gj*a6 qtd) ivf )m air 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 s4o)- u 4z;xja 2rot*xs0yev poound 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 a shriek w7ec4pig+ ,lg ;gj,8dr a e.yohhose echo reaches it 0.0250 s later. How far away was the objecthr j p;. oiec84+eggy7la,gd, 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 echo in 4.00 s. The temperature )x /.mw miza-l-1kxapis $0 \; ^{\circ}C$. 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 f59v/xwrv9 v.cbu +mprlash of lightning, the distance to the lightning strike ism9w x vv9u+.bcp5rvr / 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 on7k2h4wmwv r5r1 t)omb 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. How defgvv :ku4s 0exq0z3p(ep is the well? (Ignore air resistance, and assume the velocity of soun :x0g ue4(0z vkfpv3sqd 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 Hz t /(kgtnf t;8eis

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45#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Sound traveling in airyn(r 4iu6 cctlbrva8w-un/*- 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 le*,r9u)a)v+f3t9 pr/hzzzte g vrg *govel 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-dBxr8d n(4 zhvj+n3:oyk 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 inte;k5rcb5 19qgqm+jmjynsities of two sounds with intensity levels of 70 dB and 40 dB?cqm km; y5+1rqj 5b9gj

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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 abig86d;ks4x intensity level generated by one engine4;6iksx bg8a d?

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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 radsbetm . u46m.piating equally in msb.t epum4.6all 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 fr:j o)i3 m8aw,9g5po1fvd inw som a source that is radiating equally in all directio1vd: )j 5asg n,i wfo3im8w9pons 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 a ufk eoyd*3 g,nl qt/0)*qf0nnssumed to be uniformly distributed in all directions. What is the intensity level at a u td*nflqf*/o)03ey k nnqg0,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 g )uyz629vxoudog. What would be the intensity level if two identical dogs very close to each other y9)v6u2x ozg uare 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 f(eu (l,gwc rc/.twrw 19 f(gkfrom 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 thw.r f(wwckr9fe(u1/(,ltcg g e 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:ycu s-epez.s*. + ly;osns pm s2.o8u point source is 95 dB. At what distance will it be 75 dB?-;o8ms ucsseo s+.2u.n.z*y sep ly:p

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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 frequenyj cy .fl*)ax,a o0xr:cy of 1200 Hz. What is the frequency of the fourth harmoni: *r f0a)x xj.caolyy,c?

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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 third4+dfz 6djt,i y harmonic of an open pipe is 900 Hz. What is the length of the6y tz4jiddf+ , 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 lengtyj/vcs(jy wms45.rf -h L is 400 Hz. What is the fre/c.vsyrj j( - 5m4fywsquency 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 0.80 m. xof :gqkf7j)t*x0x2cdosk )a,3)t sl If the velocity of sound in air is 340 m/s, what is the frequency of the0o *:f,kt7f t2)) olx3s dxakcxq sgj) 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 i1: x,bi-v pwb- u*l5tc.ghv xfs in 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 freq) m6xr2qf4i qqdg17q cuency in a pipe closed at one end is 330 Hz. What is the frequency of tfqg 6q7d cqi124rx mq)he 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 shorteqylg*e h c01of8cx.o 0st pipe closed on one end that will have a fundamental frequency of 60 Hz one0cox.olg*0q chf 8y1 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 temperature ,1 /tb8u7gu r n)*cdt axpc12ahs6 mwdis $20 \; ^{\circ}C$. 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 temv xsit t162oi-perature 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 s*97yx u0ht. sztk+:zq ubd:q2ndztv3peed of sound in air is 340 m/s. What is the fundamental freque xqhuut37 :.t9*vsq k2b: dzzd0tzn+yncy?

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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 hxtub76bs z :(same length: one is open and the other is closed on one end. If thu76sb zhx: (tbe 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 e, ilm.bpw qqn6:lb 33bmit a frequency of 800 Hz in air where the velocity of sound is 340 m/s6npwl.qmb b3: b,ilq3. How much farther back would source 1 have to be moved so an observer in front of the 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 by s/+ *i n5:plxxxj-xf,:ziy ib;op*kgjide and driven by the same frequency of 500 Hz. If the distance from a person to one speaker is 5.00 m i+5*/: :kxb pjixn,pgf l ix*o-yj;zx 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 the beat fredpr*; c5dswm5 lf n5s5quency?

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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-bwv-/a8 f x geo,x2no fork to tune the frequency of a musical instrument. If the tuner hears a beat frequency ofg 8v-e/a,- bx wnoox2f 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 sof)vya2d 7bwby 1 q0pp6unds produced by two horns are 6 m and 7 m respectively. What beat frequency is heard when the horns are sounded on a day when the veloc6)y 1afvbbppy70qd w2ity 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 stringu,k ,3szune3ck w83ox s on two violins in an orchestra are found to produce a beat frequency of 2 Hz when a frequency of 660 Hz is playz8eu 3,kwc u,sxo3kn3ed. What percentage 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 q +qr1bpp(az +a stationary 1000-Hz sound source at twice the speed of sound. The observerpb(+qq a+z 1pr 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) approacm3r* sjva9m6sz w 37pdhes a stationary observer at one-half the speed of sound. The observer hears a frequms*36 apr d97mjws3zvency 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 listenvtik ./5xoc: vdd98 rc, xcld3*p vm3wer moves with a speed of 30 m/s away from the source, what is the frequency heard by the observer? (Thewd8 5xcci vdr3 */.:dvxkvm o,ctp9l 3 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 h)*gn dhh 6(iub1ho4iood 674ixzu4xa day when the speed of sound through air is 340 m/s. The car approaches and passes an observer who is standing alon uugo7ihd)xib1 4 6*ox6hzd( hho4 4ing 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 hs qkg+ 3w;+amieard by a stationary observer when a train approaches with a speed of 30 m/s. +;w3+qms agik 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 vcnd+f.wvps2ve :b04( nb: qh3as-f x whistle.x.34wn 0-:sedbpaq b +nvf(c2:fvh vs Take the 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 120 k,uc/-vd5 phn5fcctnd2d9o3 km/h toward a stationary train. The train blows its 400-Hz whistle. Take the speed of sou2 35 t-fn/ ccp,k5vhuo dc9dndnd 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 zx, og39isde(km/h. The train blows its 400-Hz whistle. Take the speed of sound to be 34xze,9 sig (d3o0 m/s. 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 u.9.a+gg ozrnkm/h. It blows its whistle, and you hear a tone of 400 Hz. Take the speed of sound to be 340 m/s. What i9 +.rg. zonguas 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 gewg.(6s (uphzf6 m3zfh/v :chorn is 500 Hz. Assume the speed of sound in air is 340 m/s. What is the frequency heard by an observer if the observer is moving away from the train with a speed of s(f h wu./6hz m:egfzpv6(g3c30.0 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 sou 3;dpwn,a-f:pzea -xynd in air is 340 m/s. What is the frequency heard by an observer if the observer is approaching the train with a speex-awp p;f-3znd,y: aed 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-kHzpr:sszf)i 2f f/k c)h4 signal is sent out, and a 42-kHz signal is returned. Assume the speed of sound is 345 m/s. pf)fz/2 4sfi hsrk) :cHow 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 ffu0e:yg8 kl k-p9mlc.3khn. 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 conical shockes8s q9nn n-vf9/ t/fe wave formed?9v sf-/n se/tq9ennf 8

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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 tojd w7j:zppcxc2(y g* , Europe with a Mach number of 1.05 dpg2y7pjzc xcw,: *j( where the air temperature is $5.0 \; ^{\circ}C$. What is the speed of the plane?

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