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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 ap stfvy(24yb 0 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 conduct,h2sshn**nvv -)ef8dhqqg( yed 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 sounk +vn2 h x7otu3; -mbrtoq ,7ch9(hcbed 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 happens to the velocity ofxpt-*e kfvg8t(p v3 )o sound? (Assume tv-ppg8*t kvoft()3xe hat all other factors remain 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 souvy03b zb - *ffijl6:pgkqdu 10nd through air pb d06izl1f-q bvf0:uj* 3kyg 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 o5 ,wwlze 0/qvesla.b iro b)z1ok//*of a 400 Hz sound, the wavelength of a 200 Hz sound in aiqoob,b/ v ozwl.ekrzslw/i/ 50* )e1 ar 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 20,000 Hz are calzsv p+:j*ish5led

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8#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Sound vibrations with frequuju,/ v;f/xr gency 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 emz br.x(4ey 84cbtpfo1itting waves uniformly in all directions. If you move to a point twice as far away from the source, the freque4y.b e(zpxt4fcro1b 8ncy 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 proportion dh3*zg-e.bt wa fj q. vzy.qam98bh0.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 zz mbg8 om600t rq+kp:2b7e e24jlp add from the source is I. What is the inten+tmz2e qkzb8p7e062porjag d m:l4b 0sity 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 radiatih oejnr; j5d96ng equally in all directions. Whathe5;r ojj6d9n 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 radiatq61neoy. z3b cing equally in all directions. What happens too3nq6 ycez .b1 the intensity 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 sound becomes lr g*m4y3kwy93 kj bpwuv5e/ o5ouder?

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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 bw+kkyw13mg9jzz x900aa wt+ of tymzk+3w190x +ga9ajkz 0 wbwthe sound 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 musical n..kmdc 3udlo6 ote?

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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"niwp4y7v 19ax worrjj. wq 3mmz yt/- *,,3shv 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 from air into wat(0yrpe6n;2hfz,gd oc 5f kfc-er

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19#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Pressure and displacement wave1-qf)8yldf23esza m u9 ez;qas 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 +4 hqz0c6fm1ghog q5qkr +9s(k7vi ena guitar string and the sound wave generated by th4 5r1fngqhvez ( k9 iq+km0cgqsho67+ e guitar 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 ends, a m +0hya*h;.sjo4r+azd8hnw 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 wavelengtb:-+j axt8v oyb)l(h (lsze+uhs of the three lowest tones produced by this p((+bl:hsl tv -ozxy ebj8 a+u)ipe?

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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 ofvh) --dae(skb ths a-vhe)k -(bde following frequencies 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 itsi qboo9t5/ r5i fundamental frequency. Which statement is correct5oiro i/tb5q9?

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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, theu 6n,v 7 t7 .gywuw(uyequ+za4re

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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 three :clg,xn 0,jwf69i)amtbs .qs lowest tones produced by g q:0i ,,w sbmlf.x t6s9njca)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 length L is 200 ;l5(dv -epju6y b*j iwbwi4 /yHz. Which of the folloj5b6l/*pe u4dyjb yi;iw-v(wwing 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 zyp.t 3n mrloajgn2b3 8e3- h:its fundamental frequency. Which statement2eng a t3o-.8rnh 3:bp y3zjml 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 s6z+uud/ + mxgqame source. Each speaker produces a tone with a frequency of 200 Hz on a day when the speed of sound is 330 m/s. Tqu6gxd+z/mu +he 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 waves should havw7f 8ff -qmy+de

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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 freqffu6+u j:a:j u64cdzxuency is heard. What happens to tfa:cx+fj uj646zdu: uhe 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 expjow5w 1cf;z. jlains

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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 thg:x8 heo)rp 6i hehn2+yit 9;ce obs:g oihhr)ci; 6px8+ yh2e ne9terver 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 freqdyt bm guih g;:si :tso 2u d)3xw9dk:pn/+u70uency heard by the obs:mu9io tn:gy si xh d)up:;/+d02dbtsw 7ukg 3erver 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 doub4arw)eod:jn s2d;z ,cle its MACH-speed, its half-angle will decrease by a f de ja n)2d:4wzcsr;,oactor 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 m/s. What iah0fb,t jf3vmeb 4,d3 pra o3:s the air tr0dbeaomf,3h 4a3,jt3:f vb pemperature?

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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 air y+4rktoz is4 50:.q apejhtl --xoh8nat $0 \; ^{\circ}C$ 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 whose 2eq i61 u+ l9dlbcu.*hba*odc echo reaches it 0.0250 s later. How far away was the object that reflecte*aqllibu62d od9bcu c.+h1 *ed 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 is jehhy .l;3mp1 ai w2gjy9;5l p,,ry so$0 \; ^{\circ}C$. 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 k7lvk (,xpds. flash of lightning, the distance to the lightning st.d k,(px7sv lkrike is 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 fiofm: 5 f2h:lprom a cliff on 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 e )dcw ( n59,+3psxe /gglpwerwell and hear the splash 2.5 s later. How deep is t r+d39gesgwe5ep)cp l,/xn w(he well? (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 freq07 wm/ ku/olfquency 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 at 2 yjc yw1d(w zlr1acir/o8h;3 $23 \; ^{\circ}C$ 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 intb7r tv11lpj a-dn1, 9v(nm3fxs5 v ydhensity $10^{-3} \; W/m^{2}$?

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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 ofw oawao2/:,.loxflp ) 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 intensit fp33jr48+rvlngxy 7(i hqz /by levels of 70 dB and 3 8ijfrbrhvx yn /(47g+lq 3zp40 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 engines in a garage xb8zo ;z, e1qhis 100 dB. What is the intensity level gen ,;bqh8oez x1zerated 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 o3 po+)6aope azf 6.0 m from a source that is radiating equally in all directions is eop z63poa)+a
$6.0 \times 10^{-10} \; W/m^{2}$. 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 7ur6r4z 74h6tl qu*vsklol :qis radiating equally in all directions i4u4rql urt6hk7:6o l7z sql* vs
$6.0 \times 10^{-10} \; W/m^{2}$. 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 ajqy- v2gw1h*vwq e 8x0bout 1 mW of power, which is assumed to be uniformly distributed in all directions. What is the intensity-8 vj1wy2 0h wegq*vqx 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 distance 5.00 m from a s6 +qpddpcq3w4o 6x, zbarking dog. What would be the intensity level if two identical dogs very close to each other are barz q36qdpd xosw p+64,cking?

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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 q t7pd 5r1dquq0:ulo(from a sound source the intensity level is 60 dB. What is the intensity level (in dB) at a point 2.0 m from the soud :dot0qq rup1uql57 (rce? 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 pointjx ns/4:zx m-s source is 95 dB. At what distance wimx:/ szj-sx4 nll 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 acxwqqfl4ycbh 39 ;7dm0az3c0 complex tone has a frequency of 1200 Hz. What is the frequency of the fourth harx q0;f md9azlw33cq0cy7 b4 chmonic?

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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. o7 p02nqouk- k What is the length of the -ku2qnko0o 7p 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 length L is 400 Hz. Wy1h1ao dnx,t;jkmg;i/x m3 (yhat is the frequency of the lowest tone that wi h;t y xykdam,11im(gn/j3;ox ll 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 o c d6ju ek(*wg2y7 ybf;xb3oh:f 0.80 m. If the velocity of sound in air is 340 m/s, what is the frequency of the hy :bu;7bk oy3d*xjwecg62 (f 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( ss80/tjdja cr 3dae) 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 b1eqejm)0e+wrb l;0na pipe closed at one end is 330 Hz. What is the frequency of the thir1)brwb neje q0le0m+; d 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 shortest pipe closed on one end that will have do9tt0oc1b( m a fundamental frequency of 60 Hz on a(9ot m0dt1ob c 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 y7pz* odz)ipwxo3j1( in a 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 theijz f: 1d5kje2 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.pg-xo n,d i;v)p pcc9c wyq0y;*vl z:575 m is played when the speed of sound in air is 340 m/s. What is the fundamental frequend):vwiqyc cz-pgo0pl9 ;c y;*vpn,5 xcy?

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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 thehcw;aa*s k9ar6no6 - z same length: one is open and the other is closed on one end. If the fundamental fhsr;nw6o6-c ka aza *9requency 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 hncn0q/6b bob.t s c1.nzv/)oemit 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 observer in front of the sources would hear nob h/.cntzscqn oob6)/1 0n.v b 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 m pd3z k18uu)-nru*m gthe 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, whiugz813uum p)- m*kndr ch 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 frequen4j)z fqzy,pm1p (ab v7cies of 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 tuning fork tohb-4bpdqdrygh. i(;q;,uwuyp x7e oo-d -a93 tune the frequency of a musical instrument. If the tuner h;gh;(w39 u x adby 4 qpro--bo7epy.,q-diud hears a beat 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 produced by two horns a2(hhlxvz z)2k2:gufl re 6 m and 7 m respectively. What beat frequency is heard when the horns are sounded on a day when the v2:2 kgzu( zhllx hf2)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 an orchestra are found to)9mu)*p h joa ;pa:2ay n-qfqkpq49ak produce a p q 2)9*aqho9m a qkpp)yj 4ak;-au:nfbeat frequency 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 spe;k 7qeq.q *2l2zhzzzxed of sounzqh ;kz7*qz2 xze.q2l d. 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 nu(+he5 dnh w;Hz) approaches a stationary observer at one-half the speed of sound. The observer hears a fre( hnu +5d;nhwequency 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 lis .e+ - j+ut6cm 8mtvyjwcob.7ctener moves with a speed of 30 m/s away from the source, what is the freque8y7v-mc +jmouctwj b6+ct. . ency 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 0/lw hqp+t 2rg35 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 the roadside.rt /2pw+hl 0gq 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 stationar1f9y) o*dl ip(sn)nj vy observer when a train approaches with a npjfd9y nl )v1i)so( *speed 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 towarnld3s5 e38k8u 5zbp2q2exsnc d you at 120 km/h. The train blows its 400-Hz whistle. Take the speed of soulcpzxqu2 3kbn8ed2se3n 5 5s 8nd 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 stat73i)i-mlw n;dvl 1 oemionary train. The train blows its 400-Hdv 3 ie-wi;m7nll )m1oz whistle. Take the speed of 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 lu80al.k l7gt120 km/h. The train blows its 400-Hz whistlea0 k7gtl. 8lul. Take the 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 at 120 km/h. It blows its whigobkx6 o2e..ywf 2ui2 stle, and you hear ao2io2gb.yuxf.k2w 6 e tone of 400 Hz. Take the speed of sound to be 340 m/s. What is 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 tr95kwg e2 3c )toodfd.dqhw/n*ain horn 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 aww5 t2ok.gwdo9fdedq * 3)h/ncay 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. A,m oo1hv 7o0h+ ddh.qxhc*rthibd1,;ssume the speed of sound in air is 340 m/s. What is the frequency heard by an observer if the observer is approaching the train with a spov*oi0d,hhh . t ,1+;drhb1 mo q7hdxceed 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,mzfa0ffml6 ) /j,fr6t and a 42-kHz signal is returned. Assume thea f lz60f,m/r mfjf)6t speed of sound is 345 m/s. How 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 shz 095)spdey zkg+qq5k ock 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. Whn4o1cn :.y: aitj)ga8dyr o rmvd8+u6at is the half-angle of the conical shock wave formyad o)m8toygru6 4+cjn 8:1rv.:ad nied?

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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 wig h*9.h w; ebrb;4bdpjth a Mach number of 1.0bje hw;;gb9bh4. *rpd 5 where the air temperature is $5.0 \; ^{\circ}C$. What is the speed of the plane?

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