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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 +n85 f wad5ps+dy6kj his 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 condu23b/t vgsc.kw ij8 (5 x*vzdwscted 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 s*s.bcrc h 2l;clq 1-osound 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 o g; )rx;dvqal5 +dnn,lf the air increases, what happens to the velocity of sound? (Assume that all other factors remagv5;d)d+ rln,lanx; qin 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 9iq ljj773+5 nhcasof -af4 vaHz sound through air 3ojaiacln9h+jf 475-7qv sf a 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 of a 200 Hz soxk tp p8-r37q o*ifc3*irfi7fund in air i riipo837 fkt p7ifrc**f -xq3s

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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 20,000 Hz a4 lr-,dd5 egzwre 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 l,rxqlvu6(af: ess 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 uniformly in albp iweyom 6(yk(ar339l directions. If you move to a point twice as far away from the source, the frequency of the sound w(e3mpyi3w yr(9a6 kobill 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,m ; m(/wc gaj9zjkbp0i 83s,hd 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 sourpj(z c+z:2 lzrce is I. What is the intensity at a distance 2d from t(j:zzz c 2rp+lhe 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 eq4 ,cmgq;g:( r:cuv yr (9ccrdkually in all directions. What happens to the intensity of the sound:v:rrk,g cg49c u(cydr; c(mq? 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 t(*2hlpcpw sj2 i qcmmm7en.6n6d4 +s xhat is radiating equally in all directions. What happens to the intensity level of the sound? It7e6 2 +m psqchwmmjx*6 nds2(l pci.n4 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 xm(7imm xk) 2mz9 x-c+qrwp;pas 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 towaonl :2ddi9k9d uy ef-a akx*4g6tt;; crd a speaker emitting a pure tone. What characteristic of the sound ikod;iu ga t9n: *a6y4e -xldc2;dfkt9ncreases?

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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 music *chm7wn6su9 qal 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 ahxdnrr;-st- 0l y kaiak+- 9fdx-4u3r 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 fr e0kx) dpqs m1 mga4+xl/1je:com 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 displacemero2w ;k;b jp:koo3n8ba9 2ovtnt 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 ge d 25x2cq a8-vtbf2gewnerated by the guitaefw5x c822d2 agq vb-tr as 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 ends6q.4n i.-tl qi,ei itgi,wqo7, 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 -did.7nam7ufj ,wli 7lowest du-77fwmai7. li,d n jtones 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 200 Hz. Which one kog13 h k/euy2of the following frequencies will/21g yho eukk3 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 its7p.)ohbp s y)w7y5+s r8pbcpj fundamental frequency. Which statement is correct?+87rsjh)yo s 7pp5 py.pb c)wb

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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 other, there6jn )p c8;fork

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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 le85kbg ivbh49ay 40hgength L. What are the wavelengths of the three lowest tones produced gkg549y ihebh4av 08bby 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 resonh) ,gqva5,j m1c//lrp ssdsp1ate in a closed pipe of length L is 200 Hz. Which of the followinms5,spr japg/cd q/)1,1h lv sg 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 is resonating at its fundamental .4 9dnkoqv0l/gs o +te0-rhqc frequency. W/ gsoc.4k+ hq0e0-l9dvtn r oqhich 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 speaker )z gakbdv7o/ 6produces a tone with a frequency of 200 Hz on a day when the speed of sound isgv a/z )dbko76 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 twj8mm(v yavi /v-;2r ghemr;- qo 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 hfh n;r:d *66r3xzkw+eucv-h together and a particular beat frequency is heard. What happens to the beat frequen6*6rk: vh- ; +xcz ehfwhnr3ducy 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 explaiyxwwl- 05o kz6ns

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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 the o rom)m l;l sn-,w6z:ndbserver 6,:swon mlm;) lzdnr-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 deparsm(qh-16nath not-bg 91 b4jats from a stationary observer. The frequency heard by the observ-tsq h gtj(b1ah-69ab14 o mnner 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 s83h vy5an;ibhalf-angle will decrease by a facto3 iynv8b5;a hsr 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.of/tl v 0ag 71*5qdqxm/xrqk *mg,ha is 352 m/s. What is the air temxxmg1/a5/aq*g h qkvdt ,r.l *m 70qfoperature?

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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 sound in a1a 1wai*(dkpj ir 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 5c;d s st-(rpyibj 9fiox,xolz)z97; in air is 340 m/s, a bat emits a shriek whose echo reaches it 0.0250 s later. How far away wascpd fst97o, jiz-;biroyzx );l59x(s 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 x vl 8g 3kc/))fg5tpxoo/hf8phear 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+wj4/axo o )yx:a4gbf lightning, the distance to the lightning strike is 4+o x j:ob 4axfawgy/)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 tem5042ws( , jmc npujpg2tm8 aooperature 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 lad*a9r5q y+1tpau n s0yyrl6n- ter. How deep is the well9q ltara*n r -ypn+dy 1s05uy6? (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 ; 0xfm73eglqe sound wave 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 ah7- jo)lkx:pa7x)pq:o f, bemir 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 skq 2 q,b62zrfvound 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 aiuct-hr x )+yg8) 4s-ew3iixo 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 inte6 n cu/:zk8uu*cgzyp+nsity levels of 70 dB and 40 n ku+ucgzyz :c*/6p8 udB?

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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 intenejub; p 9mcs:+ter, r,e, li3rsity level generated bjul ters:pr+ei r3c; ,m, e9,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 d+ipiw: bttpr /r0e5;tistance of 6.0 m from a source that is radiating equally in all:b5; triwi /ptt+r e0p 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 from a s l2neh0+b3alqource that is radiating equally in al b3llq 2e+anh0l 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 xwrcx-7ja2m x 1kk/ ,e1 mW of power, which is assumed to be uniformly distributed in all directions. What is mr/cw kj e-2x7xk1xa, the intensity 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 wr,as q.:r m8lgv8 myz6k:xi(at a distance 5.00 m from a barking dog. What would be the intensity level if two identical do(ka:6z qv wl8:si 8,r m.rxmyggs 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 60 dB3p9h ( ze45vb yskt -upb(jr1f. What is the intensity level (in dB) at a point 2.0 m from the source? -3b4k5z (vt9 1hpfrsub ejy(p 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 sous fan: 1 8v,w(bi,u2mpjt1oekrce is 95 dB. At what distance will it be 75 dB2:ipsfwj1 ,e8av bk ,nuom 1(t?

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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 fc2fe2z ac uj)1requency of 1200 Hz. What is the fre 1 ejc)u22fazcquency 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 o1:gd20r bu haipen pipe is 900 Hz. What is the length of the pid:g10ri2 uabhpe?

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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 length L is 8i xo:a6) 7wjj qixi4j400 Hz. What is the frequency of jj7jai )i 4oixxw68:qthe 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. Iqd 2++ *zn2k4cw 1yja.1kc:c i nlvoxqf the velocity of sound in ao1jn+1qkna2+z y.idccv 24 kx *:lwcqir 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 temperature iny5gy .rgf-1 r ay5qx-s $20 \; ^{\circ}C$. 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.sm ,kkid79 bi is the frequency of the third har.b,k ms9i7dkimonic?

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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 p q )vdon3v y7n(8m-swiipe closed on one end that will have a fundamental frequency of 60 Hz on a day when the iow n7dqn ()y8-vm3 svvelocity 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 temper;2i:gwr ljp;q88-kz y 5y zsoqature 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 temperatuqzr,qy7m: 7tf7q2 j mire 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 of7 o.+pl(8vizmoh8tqmc fy( p ssuq:01 sound in air is 340 m/s. What is the futp7f:p 81 8c+om.qs msoi(0lz( v qhyundamental 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 lengthz9 k 8q tltvwxyq3/2v2: one is open and the other is closed on one end. If the fundamental frequency of the open pipe is 300 Hz, what is the qvkzyt lv8x32t 2q/w9fundamental 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 emsn(0b 3edxg6azp 22s oit a frequency of 800 Hz in air where the velocity of sound is 340 m/s. How much farther back wou20bds s2n3o6(egpzx ald 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 side and d ft wzpz/(d65mriven 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 the person to the otherw5/fp zmt(dz6 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,w b dijlug92k7h nz :qcfr097 440 Hz 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 tqk0wtwl:k sgvn: 0 pj;40fgbajj.e88 uning fork to tune the frequency of a musical instrument. If the tuner hears a beat frequency of 2 Hz, what ifspj ; 0lkj480 .kqtb8:: na 0wejvggws 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 rt:p93; bkm3pi/ jmue produced by two horns are 6 m and 7 m respectively. What beat frequency is heard when the horns are 9ej:uimr;/tb3m3kp p 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 tw j6h.nd (8ikioo violins in an orchestra are found to produce a beat frequency nd68j. hoiik( 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 approachmwtg 8u+d1zssfwyvm ) *h z;*/es a stationary 1000-Hz sound source at twice the speed of sound. The observer hear 1/sd; m )8f*+wuzmh zgyvt*sws 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 stati0aym.. oiz-u zonary observer at one-hal0 zau im-z..oyf 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/jpi(q *g mp:9vs away from the source,* (pvqgi9 :pmj 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 35 m/s on a; e.aa5b1o:rigs ;qa)mzq- tk day 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 changa1a qkbos.z ;;e: git-m 5ar)qe 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 staq6u5s dtfyx*zn gz q0)uykk**is8, 2itionary observer when a train approaches with a spq,y* 8ztuyix us *s k*ik6dz02gn qf5)eed of 30 m/s. 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-Hxb bdedqk -0l 4;+-*lmcr 3tlhz whistle. Take the speed of sound to be 340 m/s. What frequency do yoetld dx*-r-q4 mblc+k3b l0;h u 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 wh,p8 --kokze0 h.blukm/h toward a stationary train. The train blows its 400-Hz whistle. Take the speed of sound -u8wb h.z0ekpo-khl,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 travelinge3 nvx(a62r: h.wsm dn away from you at 120 km/h. The train blows its 400-Hz whistle. Take the speed of sound to be 340 m/s. What freqwv3 en( 2d6h:rxmsn.auency 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 +d7w 8s) u37ejuzys:ro 5wmilkm/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 actual frequency of 8s+z3 7ji5su7:wuwm )elroydthe 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 t0-qlgu; o8hft wt. xwr6qc7q0he speed of sound in air is 340 m/s. What is the frequency heard by an observer if the observer is movi7tq hwq. 0x8fg t-0or;uw6cqlng 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 ho k3rt2t-w;d8i8qeq omrn is 500 Hz. Assume the speed of sound in air is 340 m/s. What is the frequency heard by an observer if the obsi; dqwtet3rmkq88-o2 erver 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 determ 2utw k1vazs2 x1a)lk-ine the speed of an object. 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 obsa 2w11lkx v-kzt2au)ject 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 a7cs*m8tr ; sle 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 coni51/la 01hh ocqpaof9 fcal shock wave formc/ o0aqf 5lo1h9p1ha fed?

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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 Europe with a Mach nh4mwr1;,p x ,v cja0mkumber of 1.05 where the air temp,kmm 0xp 4cw1rhj;v a,erature is $5.0 \; ^{\circ}C$. What is the speed of the plane?

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