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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 fal. a;f4 4vylu,q ng6bjcse 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 y.hia 84s+ufo 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 bnf8llo*i i 13a 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 veloiti+ u*)rjoj8 p*vjc3h9hy4 d2v, cmccity of sound? (Assume rv )o4v3htp ic8ih j*m *ujc,y d9+2jcthat 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 vd+p,+ nv:4ugpa ;2fk pxf /wy200 Hz sound through air isg :vk+ pun+a y;vf,4w2fp p/dx

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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 souds6vpmnc okx0 8;-zf (nd, the wavelength of a 200 Hz sound ixk m(fn-c v6o;dszp08 n 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 greater than 20,000 Hz are cally39* k l.axmt v6le4hhozg5t5 ed

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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 1m:r 5 q e,h9ibelzoo,2qw p ta2a-1jm20 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 all directions. Ikh 9h l;d1--wzrzd y1nf you move to a point twice as far away fromydh dz1;lzn-1rkwh-9 the 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 proportional )uyr k.t/7llc 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 /0 bo8 yyvibmli90em5. What is the intensity at a distance 2d from the s 0 0miyeybl58b mio9v/ource?

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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 isoknb)t5k+ q3d radiating equally in all directions. What ha+k qn)o 3kdt5bppens 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 rabqjetwl6 8 8qf8p6 eo/diating equally in all directions. What happens to the intensity level of the sou lo86ebtq88f/eq6w j pnd? 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 sout0 vzdr 0vwo*.b;dvh*f74yjs(k i fg0 nd 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. Wpwv:te 5hbb2 1hat characteristic of the sound increas 1w pbh:bte5v2es?

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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 m l1ncx /8h*3ltbwvli+ usical 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 fwxdyv q5dwt. (9*6 elmusical 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 frn 10uvayz(m/mc)1 w+nxt9 ay qom 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 wavex 19hrcso-(kes 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 ujtm0qo h-m *6wave generated by the guitar as a result of *j0mmou6ht-q 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 bot/m, h4 (g ckm)nkzy15sjo(a sch 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 wavelengths of the thisfjf9sb4)9t l: uq-rbc se8p2hiu95f ,dje:ree lowest tones produced by ufet985q l )s: b4esi,j92j:h sdufpbrci 9-fthis 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 anpji: 5war, ;iy open pipe of length L is 200 Hz. Which one of the following ;i5y jpir:wa, 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 resona4v */*x4e)8 fwpzxicybdr 9)grm oiq-ting at its fundamental frequency. Which statement is corr)qpg* *-4 8rri/xzf m9b)wcy4dei voxect?

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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- 1qwar2eqeo c9x ;b2u 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. What are the waveleyirsi1 7uo7rj; w,;pkngths of the three lowest tones producei;,y r77okwsu; rij1pd 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 lengthazfd.o(bw s d(c.ts/xt.,fb - L is 200 Hz. Which of the following freq.(,tz/fxaofsbb .-t .dw (sdcuencies 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 fundamental6 -a:q 0 rrvkcsttp6n:mnzac 2z:2 8aw frequency. Whtn-vrp wn2cac80q:za:2a :t6 mk6rzsich 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 - y dfds:ejri*3 q -vz n6g8t+7yudj3bproduces a tone with a frequency of 200 Hz on a day when the speed of sound is 33-yv86 t*jn dddszq3fr+ g-7 j3iu bey:0 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 wqmh0m8 85fquf*0 et)if zafy7 aves 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 sq kqw 1mtx26el x.a6e,ounded together and a particular beat frequency is heard. Wha .k ,wxeme qaxq62t6l1t happens to the 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 explairq ji* 6qoc5,3ibk)pbp g e94nns

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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 heard1;f2yz dxe cjsb)+d.n by the obsere1 yzfn2;bj xc+ dd.s)ver 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. Thg8fiod hhudvfp2; i)m t-.-6ye frequency heard by the observer)dmfi.d h-;-ov tfp6 hg8y 2ui 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 will decre: obc r3m76jomase by a factmcbjro3 o 6m7:or 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 frequk6 0cyt v-8vt(q+gqk aency 45 kHz in air is 352 m/s. What is the air tt c0y86gq t(kvq v-+akemperature?

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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 7wln ne ib181f(r7dzp5gqvp4 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 i:pa8n.b: vqpp5o90ca gf9) ,odo jxsms 340 m/s, a bat emits a shriek whose echo reaches it 0.0250 s later. How far away was the objectov sdpm.x5)0 cojnpf9 apq9a::, go8b 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,7 5abhz):7kpnun jjozew: 8o3 and hear 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 lightning, the distance )h (*nthrfo5ga wuf. fsom; -eie2/x/to the lightning strike is aboutrms;*n gf/5f.(xoif2 /ue heto)ahw-

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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 w5js6p*:an ci 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 d0 :ca 6xnvqd2+2pzwn neep well and hear the splash 2.5 s later. How deep is the well? (Ignore air resistance, and assume the a+ 0p2znnnx2 6dqvw: cvelocity 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 soun2:e2x4c,sn -vfso oqu d 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 air atr(8l5ae *g3fynzlof7tk w).4e iyj4 s $23 \; ^{\circ}C$ 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 levelivgnb(pz7 ,j: 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 a 70-dk1nex yr d3f- 7ho+;ysB 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 intensity levels g -fyswp* *3k9hyki*l of 70 dB an3h*gsp-yk f wk9i*y *ld 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 engines in a garage is 100 dB. t; r6qodjjmrkbp6 p,irr(5/) What is the intensity level generb rt; 6k,rrjjqmr)(pido5/ 6pated 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 :0qs6 -ctw las)rb:tsm from a source that is radiating equally in all directions6s- rcst)blq w0at:: s 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 radiatin -eqo4*xm t+. 8ozirhlg equally in all directions i4-+o 8rlz oxhe tqi.m*s
$6.0 \times 10^{-10} \; W/m^{2}$. 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 p1a zzp6b k)aj/ower, which is assumed to be uniformly distributed in a/6z b)k jaap1zll directions. What is 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 at a distance 5.00 m from a barking dog. What wovf9ewfi5)g3 vk ie8x2v7-o o puld be the intensity level if two 352i7 x f98foegvwiek pvvo -)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 sour py os/m;+egs/ce 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 equally in alpg/ mye+s/s;o l 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. Az r+3nqoc3recsei( :)n .,)a4pn as ptk7xe4ut what distance will it be 75z 4np n7o stekc,4 (ep)3xsre3:ciqr) .anua + 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 frequency of 1200 Hz. Wha5bu 2yh;3tdz rbwss6 :t is the frequency of the fourthuh dw;ys r:z6s53tbb 2 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 :vw9 an/ twh;lopen pipe is 900 Hz. What is the length of the pwh n9 t;lw/:avipe?

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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 anfa*.7/;vjfga xt:snw open pipe of length L is 400 Hz. What is the frequency of the wf;f /:tgsaax*jvn 7. 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 /x+ jt0q98w spkzvv .tof 0.80 m. If the velocity of sound in air is 340 m/s, what is the frequency of the second harmo09zp+kxtjqv tv/s.8w nic?

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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 -mxbrqq ..,atrxd6;ais $20 \; ^{\circ}C$. 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 1/rn6g d2if uirek-k 2-p5 keoclosed at one end is 330 Hz. What is the frequency o1-k u/ofi2 r p2-ekn6 rie5gkdf the third 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 clczwwsu - v/4-aosed on one end that will have a fundamental frequency of 60 Hz on a day when the velocity of sound is 340 m/szs - a-uv4ww/c?

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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 t 2iis3d am-0xa5-tpcvhe 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 ter. iv r5iei)j0mperature 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 p 8gs3xns :o*yjlayed when the speed of sound in air is 340 m/s. What is the fundamental frequencyo8:gn * sjxs3y?

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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 isxw5axcur ((6jsa u- n6 open and the other is closed on one end. If the fundamental frequency of the open pipe is j5sxurw(n(6x c6aa-u 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 v; zytjjwc4fg7vx7p)2l d,w, 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 x ;4vv2ztwj7pf wl, c y,d7jg)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 fp.j 03 .mg)ib8vzw 6jafk hd:by side and driven by the same frequency of 500 Hz. If the distance from a person to one s.. k)v3jf 68 gfz bpmd0hjawi:peaker 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. What is the beat frequency?(,ucyzr4x b 0k

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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 frequency ounc6(7 w b9href a musical instrument. If the tuner 6ebcrn79( uwhhears 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 sonb96t gnt/og4tz ( u:uunds produced by two horns are 6 m and 7 m respectively. What beat frequency is heard when the horns are sounded on a day whenb4 n9uz g: t/t(tno6gu 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 an orchestra are found 5h mpm2;:dn; qab -zifi, zxe-to producm;a2z-m e if-5pzdihn,b ;q:xe a beat 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 stationarykc/ gefw,xil6t836s r 1000-Hz sound source at twice the speed of sotw86k cgx6 l3ri/fs, eund. 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) apprru2 i tv7t-kyxnzpv*oo 7vq 4.ay.8v:oaches a stationary observer at one-half the speed of sound. The observer hears a fre4*vtvr uz oxpa-v2yi7n.8 vt.oq:y7 kquency 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 frequencyelp7o :5 3zn ipf*3gkp of 1000 Hz. If a listener moves with a speed of 30 m/s away from the source, what is the frequency heard by the observer? (The sound speed is 340 m/s.5o:zfep 3kli p73gn p*)

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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 6l)in zjox-g*.w(vod traveling at 35 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.-vj*x(od ozigl )nw6. 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 appb:v3*r 5.(xyl 6haokh/y:f zg wykq 6croaches with a speed of 30 m/s. The frequency of the train horn is 600 Hz and the speed of sound is 340 m/s(zyba/ .q 6ocr6:fvk:5hwhlk3*yy gx .

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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 blo96c,gz4 mbytrwz2 fn )ws its 400-Hz whistle. Take the speed of sound to be 340 m/s. What frequency9r6b gzc42nft) y m,zw 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 station1r*ced hhwv,26ro2xjnd p,w*ary train. The train blows its 400-Hz whistle. Take the speed of sou6wjrp d* erdocv1xw2*n2 ,h,hnd 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 ahkj+ eq pfv9rkil7f1 )/,0egn t 120 km/h. The train blows its 400-Hz whistle. Take the speed of sound ji)1k7nfpkqr/ fv0,g l+ehe9 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 had 629 2z:tqsys ufjdzl() 6wbear a tone of 400 Hz. Take the speed of sound to be 340 m/s. Whwuf y96(db2 djslz62qts)a: zat 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 train horn is 500 Hz. Assumev*+h)klyhth6y w1/q5kiqag. the speed of sound in air is 340 m/s. Whyqha wqh5tl6*g+1ki.)v /y hkat is the frequency 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 trairo.v28ybi 4 r.uhtam(+7 ra/vh 7ueovn 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 approaching the train with a speed of 30.0 m/sv.v.h2ur74htaa/ i 7uoro +ybm e (8rv?

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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 determinzze ,oen,f4y+i6 d.x3 (w flzie the speed of an object. A 40-kHz signal is sent out, and a 42-kHz signal is returned. Assume the speed (z yoenf,+,lez6wf x.3 diiz4 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 shock wave produced by a supersonic ae)h/mlw8 mqt y2-d02:b;q l hrjzk4lt ircraft 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 ofr*sedqi8 egbrq2+ 2o ,cim -;p Mach 1.4. What is the half-angle of the conical shock wave8rbseo,p rm*2;g ed-2iqc +iq formed?

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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 ts-gdmyw5 2:ni o Europe with a Mach number of 1.05 where th2mw-n i5:syg de air temperature is $5.0 \; ^{\circ}C$. What is the speed of the plane?

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