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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 followiaw t-s;a/ mghr0e8u )xng is a 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 faspp --p3 ehk-betest 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 ins7rbc+om q mo bitk)7(2zny 8* 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 velocitw wy0xv :jqt./i+zx)nv-t; jvy of sound? (Assume that all other factors vtz t -)wxqvi;w+xnj v/.j:y0remain 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 g5s1,ntu5rq -qq; xqisound through aiqqr s 5-xg1itq 5uq,n;r 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 wavelength oy0 5m .mbe sv+ fty40qstrzrhp9z,s76 f a 200 Hz sound in air im+reym 57 bqzt9s0p6, t 0z.4vhsfrsy s

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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 thanuwv k*44bpb)o--tzqm ch u,p4 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 Hz are ca t l,h8,le7bmp+g 2f yin ka*yw)vq67clled

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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(hwgae)a7.e f th+fj4 waves uniformly in all directions. If you move to a point twice as far away from the source, the frequency of the sound will bet7.) a+eahf(hf4w je g

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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 proportionn( *f(bvfi-6 ros .xmyvr+6it al 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. Wg,x h1e0 hny9e*ii-xehat is the intensity a 9-1eyn xe eih,i*0ghxt 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 radiat6- qw bp1 n9h)mr24c9isdy:jp,v ytpnz81 l jaing equally in all directions. What happens to the intensitvnjmr9a zl 1:2j-whd8 t ,qyc19)p yn64psbpiy 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 jglulp+t:,r6 from a sound source that is radiating equally in all directions. What happens to the intensity level of the so: jlrptg,ul 6+und? 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 incr2o jk aa 0ay-05ko.lmyeases 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 speaker emitting a pure tone. What characteristic oq fz-sv8wta/7 o76pggf the sound incre /g6ts afqg7opz 8vw7-ases?

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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 musicau *gn/kfx;u17 ok0aqf l 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 note?yn 89rgw97 4gxa9jrls

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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 bien 9pctnn.fo .6a:dts+:jyt+,0f v 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 displacemaz3swg1itmx*q. u/.)b rtp; tent 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 the sound wave generated by fc wm229.ym/ lh5iloithe guitar as a result of this vibration. What do these two wave yl /2ii25cm9w.flmhos 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 w8iv:euq fd86-uih b /if4hg7ends, 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 three lo5m6opl/vui)n (gmsx 3west tonemou/ l3m5isv (pnx6) gs 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 inl oc2urc6j*y6e5up paqg;,7s 200 Hz. Which one of the following frequenc6qeng7cpr2p a;y*6 5luo ujc ,ies 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. Which sa,i plo57n* :pioru0 otate la*poo75ipiun o,r:0ment 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 iskjigyf 9pi-1iugpv 1o9/t9i( 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 o4(0z dgwbwgede (mwz ,9)a3awf length L. What are the wavelengths of the three lowest tones produced by t w mewzd)0wzd(aa(,geg 3 w9b4his 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 resonedpmp+16i:hn ate in a closed pipe of length L is 200 Hz. Which of the following frequenciesm1pe+d:inh 6p 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 resonating at its fundamental frequen::(. 7 juy*thelam xrjcy. Which statement is correct.*ehu l7rt (j m::xyja?

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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 saoy()k*b oe7 icl1 f0upeaker produces a tone with a frequency olb ofa(1yo)*7u ei0kc f 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 wa,-nsjo 40kp.cx9smo jves 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 frequen ( ckkft:oq(i 0fng.mj0 n*g:jcy is heard. What happens to the beat fre0nmi(* njo 0tk: f.qcj (fg:kgquency 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 explaig 6uo45oudgvzjns no7l.+.s 2ns

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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. Th8ttgj5a1o 6 ahyucsfc53 j21lv0,o joe frequency heard by the obsoo0cts l1uyfagvjh, jt32a5 6cj581 oerver 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 frnva u(i26 oyw88msa, aequency heard by the oiw6a2am 8,y8sa o n(vubserver 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 hal e m ll0jmdr9zz83t/z/f-angle will decrease by a factor oflr/zt 3 lmmzz8d /09ej:

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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 ultrasonice (y36p y*d)g1hlcqtm sound of frequency 45 kHz in air is 352 m/s. What is the air tmp lq)6tyh(e31y *cdgemperature?

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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 spco3ae7e;tzk )k q9(uw eed 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 of sound in air is 340 mgbu:axi. 6f i6lwyo 398,fsz 6vyti 3k/s, a bat emits a shriek whose echo reaches it 0.0250 s later. How far away was t3uow36zg.tkx 6869 v a :yilfifiybs ,he 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 hep4 zdxhg mr7+(ar 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 seeing a flash of lightnp wx-zr x5p6cg7 wm,mp0/m2p uing, the distance to the lightning strike i/px 6-zpp 5p7,m grmuc20 wmxws 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 dul4 ltk1ysryvc2m6 /(;cefx 4ay 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(14iv9le 8 k w3r,-hlosaudiw hear the splash 2.5 s later. How deep is the well? (Ignore air resistance, and 1ihk(vwd e4o3 l 8ls9uw,ir-aassume 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 wav5y0i5jzl )-gz4l;zaazg6 zoje of frequency 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;9wr 9r . cjscyu+6vir 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 witgxvpv6p-eyti350ffanzs d+qmfe4 / ,5m9 j.s h 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-dB sounol6 keaj9+8irw m4: rnd?

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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 is,l p5y fa zj7x2f4ma*m2 z1ttntensity levels of 70 dB and 40 dB p,sf4j2tm1z*zx5ft 72ylaam ?

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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 intensit;t5 o kc8y0al*5zxqpry level generaky*xtr58q pac50zlo ;ted 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:wk *rbowlp/ ng*r,-q is radiating equally in all directionswnr* g ,*wk-p blroq/: 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 a)sxgvm(;d x4 that is radiating equally in all dir4sdv(a;mxx ) gections 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 phc(x1 a e bxgy,/* yr60s.ikchower, which is assumed to be uniformly distributed in all directions. What is the intensity level at a distance 5.00 m from the do(,sycha.kycg06b 1rxeix* h /g?

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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 d2lkk*oz5 q;7batz bz6og. What would be the intensity level ifkk *o6bz7b5z lza2q t; 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 6()l gv)ja zw1r-wdd)q 0 dB. What is the intensity level (in dB) at ar1 ww-j)davzlq ) )(gd 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 what distancgfztnv7. v.va b./w3ce will v.ftgznavcv.w3/7b.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 has a frr8z 4z06;3* b cmun -gmheszusequency of 1200 Hz. What is the freus8mh mz0 zen* 6 -zsbrug;43cquency 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 900 Hz. What /sv 2a;qdogy9:s b33l jtuu3 mis the length of ttj bg v92 3u;ls ds/am3yo:u3qhe 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 a.cfw- gu)mh*in open pipe of length L is 400 Hz. What is the frequency of the lowest tone that.-fgh u iwm*c) 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..h1tp iauqo8q ,7rt2b If the velocity of sound in air is 340 m/s, what is the frequency u8bro2 qt.1pt,7iaq h 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 temperature3btwk due(lx7 7z-u0 h 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 33s)p61u tgl2vl0 Hz. What is the frequency of the third harmonv2gl61pt) sulic?

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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 u,x.lsmg3k 7)/djbyh that will have a fundamental frequency of 60 Hz o.ygl /b)7khmsux, 3djn 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 e 9o+sujoa4v8qvyh)9 j(rs)ta room 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 a room where the tempsnmlej9djk 8 l y5f39-erature 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 of e mlh-bvd ckwz9i w26-y 0f.z.sound in air is 340 m/s. What is the fundamenkfezz-w lhmwv. i .b6yd- 2c90tal 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: one is open and the other is ec 5v cl0 *tv(4mabd54tsy sd5closed on one end. If the fundamental frequency of the open pipe is 300 Hz, what is the fun 0mt(vc*t lsvas555eb44ydc ddamental 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 where the velq2 7j1t.wrywn ocity of sound is 340 m/s. How much farther back would source 1 have to be moved so an observer in front of the sourcj.1qy 2t 7rwnwes 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 s x4b(vo2s7ow eide by side and driven by the same frequency of 500 Hz. bswve7 4( 2xoo 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 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. Whatpixb(qoo.u / ip/mc*j, y1nv 0 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 the fre :tah:w 1qwo;hquency of a musical instrument. If the tuner hears a beatth; h:wa:q 1wo frequency 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 sounds z vbtz8vi)+ v nkv,6h1produced by two horns are 6 m and 7 m respectively. What beat frequency is heard when the horns hi v,+t6vz8) z bvkv1nare 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 stri qwu9)2 tpk7wangs on two violins in an orchestra are found to produce a beat frequenqa 2)9pwtk 7uwcy 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?

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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 sokwqfl,o8z -3peed of sound.zlo 8,wqo-fk3 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) approacnnj87q :a hul(hes a stationary observer atjh:una7 l8 (qn one-half the speed 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 Hz. If a listener moves with a speed of 30 m/s jsp3oo*rkj1 *away from the source, what is the frequency heard by the observer? (T1 s3koo** pjjrhe 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 day when t8xn m h1n7nsqc 9t6 zyc(t/ pj5dqqx5/he speed of sound through air is 340 m/s. The car approaches and passes an observer who is standi95zh6 tsq5jdn /7qx cx n/nc81 tmp(yqng 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 approacheszt:dg a0 5(6fp *xcxdohy6/qg 5i*yix with a speed of 30 m/s. The frequency of the train horn is 600 Hz and the speed o*xatx(/0 5xcoqiyhpd66z f gy5d: g *if 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 blow9o+mihmkg4m5nahlms;59 a.w 0) zppcs its 400-Hz whistle. Tak5zlmmp no5 0shi);m+4 pwaha99 .gmck e 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 stationary tx/pk/l4tnhc em)1 n3p rain. The train blows its 400-Hz whistle. Take the speed of enhkn1lxtpcp 4m/)3/ sound 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 km/h. The train blows its 400-Hz whis89grw.m9 cf5g,9*q tl2esio cpabp )otle. Take the speedw8eq)i259a or.bgpf* oltm 9p, 9csgc 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 at 120 km/h. It blow(+lijy9yh p/(on, )(t bfk uxjs*3vbys its whistle, and you hear a tone of 400 Hz. Take the speed of sound to be 340 m/s. What is the actual fr/u3i(o+(xbvhnplyft yjbkjs y* (9 ,)equency 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+ ;ve kxrnt8) j)m7marq ,.pum+bhf m; in air is 340 m/s. What is the frequency heard by an observer if the observer is moving away from them+ mruem7+a) ,;).mfbnqkp8rjvx ;t h 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 the speed of sods8(cf :rk6fr1,srkrund in air is 340 m/s. What is the frc8r ,s rrk (dkfrf1s:6equency 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 an oa5s xahi8b7 cxr( b+fr7-+qanbject. A 40-kHz signal is sent out, and a 42-kHz signal is returned. Assume the speed of sound is 345 m/s. i5 n7f8 r+ba(qca +sahxr7b- xHow 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 produch54wz q.v6l j3fj.dnak)pg- g i ,h0cped 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. Wa2 vo;z e0/nu/ yav3sehat is the half-angle of the conical shock wave formedv/;2/vu 0yazs o3neea?

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87#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The Concord airplane flii)mxeba f ue4v 89rh-s *cuc,*es from the United States to Europe with a Mach number of 1.05 where the -8 cbv,9fe*uxh4ae ciurms)* air temperature is $5.0 \; ^{\circ}C$. What is the speed of the plane?

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