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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 7ys5xox*b q wr-b./l8obfrw4 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 iswh,,jxd 2 r5pv conducted fastest 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 rdh(i s*h4 7xs yk:m-uq/b;t xsteel 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 hak f,6y9 c+axfrp 6v,kjppens to the velocity of sound? (Assume that all other factors remain cfc xkfv kpr9+y,aj,66onstant.)

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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 ua0ngo ,e a6s:mb- i0da 200 Hz sound through air i ud0nsie- aa:b ,60goms

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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 wave0ofttz r. k6 8fd;ho.elength of a 200 Hz sound in df.;tf 06zorkh.et8o 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 frequencies gr.gfim,6(3k -s f r bqfp;e9cjteater 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 2+id,2 eclw rdc;-cd (n;4 5 ozfuk4hoj0 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 waves uniformly in a3;d qmq/( teqqll directions. If you move to a point twice as far away from th(q;qq/qtm3de e 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 pro k1madgz n.q 17p))gaeportional 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 sourcejxp/ce3eq + j5 at a distance d from the source is I. What is the intensity at a distance 2d from the sourcj xejq 5c3+ep/e?

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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 sous5uz//jl+ n 3wbl m)fcnd source that is radiating equally in all directions. What happens to the intensity ofcb/ lsn /)mwu5l3fz+j 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 all d6 yhv,3cx/8olmxr :oif73n 2h d*lubnirections. What happens to the intensity level of xond 6uxl2b*hy/7l8:3,chfinm o3r vthe 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 be m k.l5n6oowz7h;3unb comes 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 eqkceb 0 /0fm8fb fa+5e;jfy:j zu n/;s-ei(fpmitting a pure tone. What characteristic of the f(fmfn /0zjb akf8ejciup 0;+f: b5- /e e;yqssound 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 mu1 10 gd6wzi ,emivf/yjsical 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 "p 4m3)xoj ggk4oitch" 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 frox cah7- up3-:rv2bblo5c p6dbm 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 waves arer7m6tp 4nsi z(

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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 o2z/ot+3 vlhlt 84u.uag)eada/ av4g p n a guitar string and the sound wave generated by the guitar ahvg2adapzo.l+/3gt 48a/v tl)eu ua 4s 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 whichfm 10a5(5q e xtvpl,i5j r,stl is open 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+ua kyq;)f7 te length L. What are the wavelengths of the three lowest tones produced by this piuqeyk+7ta) ;fpe?

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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 umd) lamj88 x.m8xdh rnm/f-*ug/;pc is 200 Hz. Which one of the following frequencies will not reslr -mu*x8n;.d)f8pu xmd8 aj/ chmg m/onate 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. +t: in1p+z5mea 3fw pxnag3l, Which statement is comw3 ,xln:i1 3g++fztp 5pneaarrect?

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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 openx5af75* nugwq md0 gs7 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. h9v k* emtiy,2 What are the wavelengths of the three lowest tones 9em vht2y ,ki*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 976kmuwcma;w*l6( zqma: hx. 7g sbwyclosed pipe of length L is 200 Hz. Which of the follm:bg7mc k a(a9.zx wuyhw6ws7l ;*6mqowing frequencies 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 :3la2pkr 9(h d i5vyrdis resonating at its fundamental frequency. Which statement is3h:lykrraivd5 p29d ( 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 speake4b/3 fgsoj3i gr pr43b 3gij ogsf/oduces a tone 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 sound7/6 y4pmen 29j5x tktf xcc3mn 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 freq1 .(mt)rl tbuguency is heard. What happens to the beat frequency if the frequenc)g. rtum1(ltb y 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 explains bnpe:5n6v;id9zmz(j

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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 frequeu9v+ -vfmt2e cncy heard by the obsee2fvc+ vtm-u9rver 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 frequencyy+b;kn 7h mk7 e;ix( prm.qyi+ heard by the obsqkmi xy7k.;m+e+ 7p;b(y rihn erver 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 dlj /v4w8a,e67ceka0 + venvq*d1jmk will decrease by a /dkkv1 qcae78,a4jjelv6 +d nw m0ev*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 sound of frequency 45 ki i c*.hm 6y16n /;l( hydnsvb3bgciv+Hz in air is 352 m/s. What is the air 3bvdi mi/ h n;yi+6v( 6chbycn1*gsl.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 speh nr 7;0zmd,hfnzd 6jp.-l)btxl,i9eed 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 op7)(mx1:c wmewgg 2w ymt5fa7 f sound in air is 340 m/s, a bat emits a shriek whose echo reaches it 0.0250 s later. How far awaftcw721 e)mm x: gywm p7wa(5gy 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 echo ina8di-2s m9izjbtl.57sn4ju( t qu ooiyx7-1 d 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 lightning, the diaa((za vcb* a/stance to the lightning strike isaac/*a(bav (z 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 day the temperature is 5ooyqsj( 7 *fa$15 \; ^{\circ}C$. 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 deen; crue6fv 6u7r ,.asbp well and hear the splash 2.5 s later. How deep is the well? (Ignore air resistance, and assume the veloc 7,su. acb6n;6rv urfeity 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 Hz igutbhy -uw 1 w -o4.5sekq)h1cj/mzr4s

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45#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Sound traveling in afg/ ; sxu*dt5v h4*r.homqy y-d( d0apir 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 intensityeoldp3ptfss 1p5dv,qom 9iq 5*sf79 xu sr60 * level 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 ae izdey7j0ln ;jqcqd33m/3 wm3-etr4 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 th a749.qhs5dg*ti gdaf e intensities of two sounds with intensity levels of 70 dd dgtgq*5 ih7f9a. sa4B and 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 by 15 nq88ak q5(;m3 jjk6nz(i* 2i:sp rnzx ;apecy engines in a garage is 100 dB. What is the intensity level generated by one q*6j 82 (i(zzcj e8n;;axrqy: imk5np3naspkengine?

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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 myn, +99qgw3 rcbtpdm / from a source that is radiating equally in all dirgc+rpt yqb n 3,m9/d9wections 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 radiatinuxg,r5n aj7-ng equally in aag nn-5 uj7,rxll 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 6u n i;e:jt,/rx*.pfemim-ap mW of power, which is assumed to be uniformly distributed in all directions. What is the intensity levea r:,fej*e tmx u.;pin-6/ impl 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 5lpm -9;b2y ucrg; ekydd :y6dm from a barking dog. What would be the intensity level if two identical dogs very close tdcb5: yy; ;ry6pklg 9d2de -muo 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. Whanxne9ac4azcaf1 -k,wwa), 8 at is the inawk,acea, c n8-w1zf9)4naxatensity level (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 source is 95 dB. At whaz3qew3rfk2 owz* 024u8ybh vd t distance will it d3h*2zb zuv04rye2 3fq k oww8be 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 t8* fwemkv6n8 3 xt*rvgone has a frequency of 1200 Hz. What is the frequencx6*mgrk tn 3ve88*vwf y 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 thflxx1u) 2 f *p+5ljl7 8greultird harmonic of an open pipe is 900 Hz. What is the length of the pipe u827xtl+u g1ll f5fp *ejx)lr?

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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 realo .)fj c6lgaa1oq:y,i) r1asonate in an open pipe of length L is 400 Hz. What is the frequen)iq6.lara 1,ajf y1lca )o :gocy 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 bot .;9c vwr)bf7gdygqmg+; r q0h/bs6qth ends has a length of 0.80 m. If the velocity of sound in air is 340 m/s, what is the frequency of the second harmb t)ys/.g6 q9 r;mvqh;+w7bgqd cr fg0onic?

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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 w3,awf yy8yr o,. t4qq+di9 gqrhere 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 one end is 330 H oa*cgv,i. 5qaz. What is the frequency of the third ha*.ao 5a,iqgvc rmonic?

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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 pi a ck/yv,rg(c9pe closed on one end that will have a fundamental frequency of 60 Hz on a day when the velocity of sound is 340 cc g(/y 9karv,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 ty 4q3ox +m q9zl+cn),fczcag 1he 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 atr7p kj jes 5jfx5 (n/7c *k-pfu;xn8e room where 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 0.75 m is playedcdphxnci:61vj 6m,3o when the speed of sound in air is 340 m/s. What is the fundamental frequencyoi 1hp,dj: xn63m ccv6?

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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 s nu wm;ae 2tf-c4o 73su jic-wy./fp5dame length: one is open and the other is closed on one end. If the fundamental frequency of the open pip ;47acpwn.ouyw5d2isff/3e -cu - mtje 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 frequency of 800 Hz in air ;zi)laagkq ( 5where the velocity of sound is 340 m/s. How much farther back would source 1 have to be ;q (algz5 ai)kmoved 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 side and driven by the sa-sl8e*h 3 .dkmc8wbcx me frequency of 500 Hz. If the distance from c*bkwh83- x8s mce. lda 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 frequencies of 440 Hz72pw dy56; g8kfgerjz 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 tuncv vd,oaa2i2g07.mw h ing fork to tune the frequency of a musical instrument. If the tuner hears a beat frequency oo.aaviw h,722m0vcdgf 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 produced by two horns are zslj8 -my(bbzz )). ff6 m and 7 m respectively. What beat freq (bz)z-f8m .y)lfbjz suency is heard 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 violins in.( xvd;k txl(m 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 tensioxx (m(ltd; k.vn 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 twic5 2.a rr m(z1k/tdb-8ujakjshe the speed of sound. The observers(/raj1-dzk j arh u82m.ktb5 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 stationm9a/y+(zp mi4xq s7fbary observer at one-half the ss7/m+ba q4 ypifx(m 9zpeed 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 frequenm1tdj;a;4 n wbcy of 1000 Hz. If a listener moves with a speed of 30 m/s away from1a4 d;bw;n mtj the 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 siren. It is traveling at 3: 5na tqw6qkmi9ip 57g5 m/s on a day when the speed of sound through air is 340 m/s. The car approaches and passes an observer who is standing along tktg595qin 6p:a7 iqm whe 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 ,(otaz61 sbs0-peuuj. e y4qgn approaches with a speed of 30 m/s. The frequency of the train horn is 600 Hz and the speed of soun-a u.(y e4p6eb0suszj1gt o ,qd 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 wg raf,.32xad3d4 ;d 2 tbfwclyhistle. Take the speeld t;f.ad 3wd234c,2agf y rxbd 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 km/h toward a stationary train. The train blows(i t2 flj8if)f its 400-Hz whistle. Take the speed of si(tfl)i f2fj 8ound 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 fro0vlildvw,t;ltpj:+ - inr8w,kn1( tv m you at 120 km/h. The train blows its 400-Hz whistle. Take the speed of sounnl(l tivrtti pd;0kj,w8n- ,+1wv:lv d to be 340 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 km/h. It blows its whistle, and you h 0vpdg)xtv ,v3ear a tone of 400 Hz. Take the speed of sound to be 340 m/s. What is the actual frequency of the g)x0pdv 3v,tv 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 osz 8, 4/u.mdu*-xicghxgau*y f sound in air is 340 m/s. What is the frequency heax 8yg,*huugs axd4mc-/iu * .zrd 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 5*wnpe) ks* k.x00 Hz. Assume the speed of sound in air is 340 m/s. What is the frequency heard by an spxk)e*.wn *kobserver 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 an objectlv2y3ufp e 1q+. A 40-kHz signal is sent out, and a 42-kHz signal is returned. Assume the speed of sound is 345 m/s. How fast is the e+y upq1fl2v3object 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 shocknz zep))5z.,gb 9sylt 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 Mach 1.4. What is the half-angle of the conicmmu zb1. o5thgrea)wy .4g5 w9al shock wave formewm g gh)b . 15ze4tuwo.m9yar5d?

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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 to Europew1 utrtf k6y) (46kxr7qj8t fu with a Mach number of 1.05 where thr 4u kwxfu17kqtjt 6y8t()fr 6e air temperature is $5.0 \; ^{\circ}C$. What is the speed of the plane?

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