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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: 游客未登录  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 ar:wj+ 7 oa-jwepuk k5)g ylq6o. pl7;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 fastest thr fe3hlu(w-iziylb :0n)l m3w(ough

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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 soun;35 t4rh/hpqor7 b2e9s e1*amyv6 gnh9cbffed 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 happensbx7 .hfvt 6d1k to the velocity of sound? (Assume that all other factors rdtk61xbhf 7v .emain 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 Hz sound thrx )jiz)i9c6wzough i)x izz)j6 c9wair 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 wavelens8nk:0 2xbx5 gf .uqpvgth of a 400 Hz sound, the wavelength of a 200 Hz sound in a0u5 :p.svgnfb2x 8 qxkir 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 gnu7 r/lu m n4 +f;wiv2tokp9t5y2up9 vreater 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 fre d,js 448zl.ehhfu )jz)3s mmrcp3;s3 cnwr6equency 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 waves iz,eg x qz.7p;uniformly in all directions. If you move to a point twice as far away from the source, the frequency of the sound wil;7 p qz.gzx,iel 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 proporti ,skv84bmhk6vwdf jb6*jyt 9 ,onal 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 frw-es,y 3 nv9xjom the source is I. What is the inten e3n-v9xwsy,j sity at a distance 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 equall*pwd+rktr 4t;dlxhs+*)8 lzo y in all directions. What happ8w *dt*lozl +r; x +hdt)p4rskens 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 fros(0hg x7lc.vh m a sound source that is radiating equally in all directions. What happens to the intxh gs.cv l07(hensity 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 followings+pxsyw)mi7 ohv+m7 4h2rqf3 increases as 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 b9cr3,ksr1 ;bqdot/:m sbx:kspeaker emitting a pure tone. What characteristic of the sounk: d/9 b3r ;c,1:tksrobqmx sbd increases?

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16#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What determines "loudnehx+x3 +gw)qi hj5mm2nss" 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 "pitch" of a musical nh df -zhlf .2dg4no)s+ qyaa-7c;muw0ote?

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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 waterpuwg6m3j 28xs

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19#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Pressure and displacementdi :5,ygdak4-t tzs,puj bw47 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 a guitar string and thei-:y5 +kqgod e sound wave generated by the guitar as a result oo-+:e qyi kd5gf 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 wh- op 2h +.jm: tnkwn9j2x7ijrlich 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 length L. What are the xyc0ggm7 l)8 da w8ax)wavelengths of the three lowest tones produced b)maa 0y )w88xxggl7cdy 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 iskh g5lxd; 4ng+d6xoe, 200 Hz. Which one of the following fdgx eh gl,6x+ d5okn4;requencies 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 resonat*q6vjbxgvim1r0z :vwjc86 5iis. ox) ing at its fundamental frequency. Which statement is correct?)msi w6brij5oxqj1 6v.z8xg cvi* :v0

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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 closeagr */ft:ap e6d 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. vr 5hedo0:9o(( 1vcej5qtt li What are the wavelengths of the three lowest tone(rtj(qoeht1e 5 dicv9:lv 0o5s 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 closed pipe of l 89q2pqoytq 8wength L is 200 Hz. Which of the following frequencies will not res2 qotq y8wp9q8onate 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 eo clrzjr u9bls2*c0, 5nd is resonating at its fundamental frequency. Which statement is coc0luz9 rs5jrc ol*2b ,rrect?

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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 s5qy5af1ml-z ez l/j i-ame source. Each speaker produces a tone with a frequency of 200 Hz on a day when the spee1 5-fly-imzaej/lz 5q d 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 y+titqvbp64bmp+5 sq8j 9 ;a ;p:kkcybeats, the 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 frequency is heard. ,vuuup22t 9,dz:, ovoq 1fulmWhat happens to the29uolvquzom d,2 1vufpu ,,:t 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 explains/ryvw *xwms*8

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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 v1o) ykif*+x;hck5whmn4e d:the observenyw+)*o 1:i5 m vx;kf hdheck4r 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 heard vdsii( 30swj :o8 kr*9zh5 hrkby the o zivw:ji0rk(9s*3dhr os k85hbserver 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 MACHs0zna lz. f;r+)wce8m-speed, its half-angle will decrease by a factor ofa.zz0 nfem+lws) 8;cr:

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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 i hv. (zhfs+66p::c -kp6eowlrfhte c: s 352 m/s. What is the air temperatu(l :rot.v:+pp ewehfh-zcs k66h6cf :re?

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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 s-rzlp nb ie821pe0u .5:vyhlqound 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 shrieks ce;r6vci)r+ whose echo reaches it 0.0250 s later. How6 ecvrisc +r;) 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 echo in 4.00 s. The te 7 6lbt9:6r)vhg3 :rzrhvcffjmperature 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 distance toi+rnca pbk cu2+i 6hy3y g+b61 the lightning strike 6pbir 3+ c+1hukb nic2ay6+g yis 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 i)i4 n em.x 5ahsk5a6rms $15 \; ^{\circ}C$. 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 hearqrse xv1.xuchgh 4a)5m( sr;:5mqq a - the splash 2.5 s later. How deep is the well?s h.gru5 :q a4xmar5; (v-sxqec) q1mh (Ignore 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 frequency 500 ertltf4 etjm/mgt6,r75o4pq0. / t y mHz 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 atn16 a (+ev:5z9lyks luvjlz /d $23 \; ^{\circ}C$ 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 in 4;a /7vnz : bz3gaidbbl b),e5gmt+mdtensity $10^{-3} \; W/m^{2}$?

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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 n2* yy0tfo7c:2 ovhth of 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 with inn .b5o4/lwq+ wckxih2qzd(t+0my 9lrtensity levels of 70 dr + odwc ll(qn5m .+xti0w4/q y2khz9bB 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+ gfpyy;fn5f/ 15 engines in a garage is 100 dB. What is the intensity levey+ f/gn; fy5fpl 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;qwgul;v ; fr* m from a source that is radiating equally in all directio *;v;u wlqg;rfns 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 6sknvq0 c;-s8 i.0 m from a source that is radiating equally in all direction q-vn;s8ck 0iss 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 assu3nx tao9bd h58z2ynp+med to be uniformly distributed in all directions. What is the inten dzyopx8 na35b n2ht+9sity 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 at a distanch;( xa7hrelk- e 5.00 m from a barking dog. What would be the intensity level if two7h;x( klerha- 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 soundzw:rn/4dng . jb 7sk/h 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 the source radiates e:h 4w/jn /knsb d7grz.qually 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 al(retn. 13b 1qly (jma point source is 95 dB. At what distance tre31(my1 .nblq lja(will it be 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 ht0lfl1rss7f;) s w kv-as a frequency of 1200 Hz. What is the frequency ) t vf01kl; fls7rsw-sof 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 harmonixg- o/yez;kvc1e.chym- n 8r0 c of an open pipe is 900 Hz. What is the length of the g;yymz kon-xche8v c-0.e r 1/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 inf.;6h 7v o9jxkmngn8mizg s5 - an open pipe of length L is 400 Hz. What is the frequency of the lowestk ;oi6sm8gf7 5.xnz hnjv9g-m 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 letu- bqzdw,6 3nngth of 0.80 m. If the velocity of sound inznq-b dt3u6w, air is 340 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 where the temj ,n4xc:kui,; e;q uscperature 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 1tam8 f ra gjngu:+act7 5y6b+/mc7qbone end is 330 Hz. What is the frequency of the third ha7atbrtj qc85mg7y+ g aaf bn/c6u 1:+mrmonic?

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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 47 2z6rmbh al;6gidzp o9yup6the shortest pipe closed on one end that will have a fundamental frequency of 60 Hz on a day when the velocity of sound is 340 764i;6 phuamyor2 6zb9p lgdz 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 gn)pv;vr mg ).-wa xt7room where the 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+j+u2sgoos3qlrc 5(s a 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 played when the speed ofbe) -54bsor obqacga;q 1s- t- sound in air is 340 m/s. What is the fundamental freq-ebabgortb; c-q 5q41sa- o)suency?

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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: one is op4:agm a9u;bagb x6 k*ven and the other is closed on one end. If the fundamental frequency of the open pipe is 300 Hz, ;:vg6bua9 *amga4 xbkwhat 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 eachm3pl0fvb r.y.ntf x8 6 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 observ 8p.30xmf6.nfyrb vtl er 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 sidea* 4-hkq5-rv-ss uoxa 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 54-kq -usr- vx*oaa hsthe 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 the3pa(ijc+)ry 0mgizl 3c1 eq)x 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 tu*uf0rqi 3uvuk4:y( d hne the frequency of a musical instrument. If the tuner hears a beat frequency of 2 Hz, what is ih q*uukf3vyru( :0d4the 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 6py6 n y8qwrprlzj/x3z 7*-5dcyv 8uiby two horns are 6 m and 7 m respectively. Wjdz8ry z3pyx6pnvq5 7w6y 8c-l/ur *i hat beat frequency 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 e8, 4 p:qmx/ jkd8neapon two violins in an orchestra are found to produce a beat frequency of 2 Hz when a frequency of 660 Hz,88a nm4/:xk jd epqep is played. 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 a stationary 1000-Hz sound source at twice the speed of y :j it31w6 9jokouqzh d/mj.7sound. The observer hears a frequencyjuhq3 dy9:1 7i6m jzokt/w .jo 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 frequi:kvp39h a c3mency of 1000 Hz) approaches a stationary observer at one-half the speed of sound. The observer mkpi3a:c 93vhhears 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 listener moves with cwjldi18 f(tk,. r2m- ordo)i a speed of 30 m/s away from the source, what is the frequency heard bymk2d d,o-(rto w1l.f jr8cii) 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 on a n eecfom4f+x*,9fi +eday when the speed of sound through air is 340 m/s. The car approaches and passes an observer who is standing along the roadside. What change of frequency does te *e++x9 fnfm fei4c,ohe 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 ;g(m fgbjg2xy )c fj)2by a stationary observer when a train approaches with a speed of 30 m/s. The frequency of the train horn is 600 Hz and the speed of s)bjgg jcf(;g2yfm x2) ound 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 tlus4 .kb9vgy fvx2)tn ,* g np;p1)snyoward you at 120 km/h. The train blows its 400-Hz whistle. 1)u.v s9 n sgv,gbnpy2p*tkln4f; yx) 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 km/h toward a stationa5 1rn+mxuesf z1c tnyr +d()-hry train. The train blows its 400-Hz whistle. Take the speed of sour u(1 fc+5tny+1zdx- )nmsehr nd 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 120zif54xgxn/ f-4b u4 nwoo;k9m km/h. The train blows its 400-Hz whistle. Take the9f44mxzkog-xfw 4; u5ibno n/ speed of sound 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.4 /mr3bhqv cb at 120 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 actuac b34 .qv/brhml 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 k,)o7 7 smhzcois 500 Hz. Assume the speed of sound in air is 340 m/s. What is the frequencz co 7mo,)sk7hy 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 thp6 x/c(gr(:wm8uf s vte speed of sound in air is 340 m/s. What is the frequency het r(g/vxpc86 fm:(usward 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 an object. A 40-kHz signal is sent out-lak78pin;kidsq 69 e, and a 42-kHz signal is returned. Assume the speed of sound is 345 m/s. How fast is the objectp 79das;q eli8kkn -6i 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 conicangytzj5cce -/4d5c1 n l 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 speed of Mach 1.4. What is the half-angle of the conical shocoi 8zby.fc 37qk wave formedz co7byq3.8 fi?

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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 Statesvl-sp(nxs8 llp 81l l5 to Europe with a Mach number of 1.05 where the air tempersl1v-( l s8 8nlp5pllxature is $5.0 \; ^{\circ}C$. What is the speed of the plane?

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