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习题练习：Physics Unit12: Sound
本习题练习来源于题库网 (https://tiku.one)，是在线习题练习的打印版，您也可以访问本平台网站(https://tiku.one/)直接在线完成(注册并登录账号后在首页左侧输入试卷号 70 即可在线作答)，，作答电子化后可随时回放，查看每题答案与详细解析，搜藏保存任意题目；教师使用本平台可以抽题组卷或一键复制他人试卷，布置为在线考试或在线作业，全自动判分成绩一键排序导出，省时省力。本试卷的直接作答链接 https://tiku.one/test70.html
 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 i (lb4*6 tjl sv znnk+k8(jrp1qs 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 fasteafalj o1 92u9rdbjx 9y+xd5q(st 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 sxt; ix)axzm 41ound 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 xueg/a.i; ,js the air increases, what happens to the velocity of sound? (Assume that all other factorssu.,;i jeg x/a 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 Hdv6( iprw;i vxo)3 *65c fpfdcz sound, the velocity of a 200 Hz sound through apdi3wfp ixc5v)d c6f6ro;*(v ir 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 4 m3ovgal:0it700 Hz sound, the wavelength of a 200 Hz sound in air io t73:igav0ml 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 freques;l cv(tbu *d/ncies greater 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 frequency less than 20 Hz ard,nt5.on 5 lvne 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 uniform4 sg+ osb j6:gutco,1ily in all directions. If you move to a point twicec+us,g6 ojbo:41t s gi as far away from 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 prq.9aj7f .zhnga)6y z 4nhaf8ioportional 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.7;v *7*pa eksosfahq bztf4)2 tnln0u sg.8;a What is the inten .s;apgff*lbkot 207u t 4e8sh*nv 7qzn);aassity 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 0 rb+l ylsqns*80ba .cpp*8ln radiating equally in all directions. What happens to the intensity of the sound? It reduc 8rpss 0*8 b*+0qball n.npycles 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 2-jr jlqyq, ;1jqx uz0radiating equally in all directionsq -rlj;q u2,y1q0 jzxj. What happens to 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 i1,qv7ww 03aubs-r :u/ m gmdxcncreases 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 emitt f ty.bop2suay;4w9zr)9 m*e5dln( v ling a pure tone. What characteristic of the soueoyr9lwua.f()vpt* 4m2 n ;z b yds9l5nd 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 noru ri)rc a*tl,. w(pu1te?

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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 muwq7 oq,tur h:y/+as 5asical 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 wate b)fmo(k mue*p6hw6 z8r

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19#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Pressure and displaceme9 8eypnv j0aq+zmq56 csidm sl6t/49ent 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 guitaat5.+rwuz+gq 1*rx ewr string and the sound wave generated by the guitar as a result of this viu* arr1 +ex+ q.gztww5bration. 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 x+ vgn3lmtixx 70,uq )d5q ji:s,vb3l 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 wavej t a9*b,0oakrlengths of the three lowest tones produced by this pip9tkab,* r a0oje?

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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 th 5xthq/fev0 ex6,j5 of the following frequencies will not resonate in the same pipeth506vx jhx qf ,5t/ee?

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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 6)hpx kahr+q,its fundamental frequency. Which statrphk)a6x,q + hement 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 is open at one end and closed at th1lxaodw5+ r/lz9 ,rjy e 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 20jrccm p7x /xlength L. What are the wavelengths of the three lowest tx r/7px02jmc cones 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 res k83, s2ki ue-uvenj4l-nmf7gonate in a closed pipe of length L is 200 Hz. Which of the following frequencies will not resonate in tha7le4fes 8 -nu2jkgk ,unm- 3vit 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 res8ub,x *o 7j7xv(ijbvj jkq;/aonating at its fundamental frequency. Which statement is corrojau 77( jbxv*jikvj;,/x8b qect?

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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 sos- wqca+io ,17n*cyerurce. Each speaker produces a tone with a frequency of 200 Hz on a day when the speed of sound is 330 m/s+e-y7 no ic1wqrc a*,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 wavdgq7uw jh vpw-(st 7 g1s;,zl/es 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 rsnwq 7/btx y+8ld+4 sfrequency is heard. What happens to the be sq w87ry/nb+4sxdt+lat 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 explaka 9v y amzc8as.,cs0nj(18he ins

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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. Thelxx k06n xz9f7q(jgt; frequency heard by the observer iqgxt9xzx(0 k6l j7 ;fns

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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 s l2b+ul,k0igatationary observer. The frequency heard by the ogia u,2lk+0l bbserver 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 decreas i8bhpgw0) gk/jth9.we by a factor j.t98hgpgw/hb 0wik )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 soune:4bl: qto bmf 53rz4bd of frequency 45 kHz in air is 352 m/s. What is the air temperature?:b 3ft5 4bl4oq: zmebr

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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*awp7 g./ovx h 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 m/s, a bat emits awwq sc+h,c,z1-ti k7 a shriek whose echo reaches it 1cs,wazqh 7-ik+,w ct 0.0250 s later. How 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. . 4p-j1rh4: -xr*jjuzhb8ob)n tuapw 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 5.0s1std vg+ey9i1wc,u ) s after seeing a flash of lightning, the distance to the lightnin ws+ gu1t9,i)c 1desvyg strike 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 from a cliff on a day tz4n yxf+25s(zj :xpsghe 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 hear the splash 2.5 s later. Hrt/mi0d7g ,zqp.0 pp eow deep is the well? (Ignore pqmrtp/ie, z0d7pg.0air 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 freq6i cd*htd 2r.huency 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 ad;zt zms- 1th9* sb;gp3 y3ntnt $23 \; ^{\circ}C$ 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 intensit 3:mn9n ,zthyey level 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 7c21e5 8 px)sus s/jqz aogb8q,0-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 inpeq p5tv vu;5(tensities of two sounds with intensity levels of 70 dBe(q; 5pvu 5tpv 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 15 engines in b.4; /yfcam7 ke nb/jxa garage is 100 dB. What is the intensity level generated by /jakyxb. ;m 4/ecn7bfone 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 is r8 hmywv31 q7ss/l dd6cadiating equally in al 3dhv6qd1cs/swm yl 87l 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 6.0wnwugc2s9ixs 5(72pv m from a source that is radiating equally in allwv 75pc2xwgin s2(9u s 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 1 mW of power, which is assumed to be 2w+gibj r apbj7.a*q -uniformly distributed in all directions. What is the intensity level at ar-*2wgp.b7ijb j +a aq 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 barki+-s1nd e;1e fw l8q/:p:wn q chrwjov1ng dog. What would be the intensity level if two identical dogs very close to each otherj 1q1w q c; w:fe hw/dosvp:18nlr-e+n 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 ++d rz pm 6p:ctz2ib*gm from a sound source the intensity level is 60 dB. What is the intensity level (in dB) at a point 2.0 m from thmr+tzp6+dzic g p2*:be 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 frov n v93zl,ywb8m a point source is 95 dB. At what distance wil z,8ywnlv3 9vbl 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 frequency off h0xsv0)9e, uno ol)n 1200 Hz. What is the frequency of the f),usho00n)l9 no xev 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 op xttg: :e3r;bten pipe is 900 Hz. What is the length of the p:xb rt: e3t;tgipe?

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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 leng:y91m- sendrr +weck)th L is 400 Hz. What is the frequency of the lowest tone that will rmsy 1rc+)krwn dee9:- esonate 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. If the velnzrm5-d1l0 jod8i 6tt ocity of sound in air is 340 m/s, what is the frequency of the secot1-0 nzlitj58rm 6dd ond 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 ini,t:5 h pl6) l+xq6riv/vv p)0evcweo a room where the temperature 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 330 Hz. Whtu gb 2cwo9*9.s0vog uizt93p at is the frequency of the thiriuvow*0 b.gpsu99g3 tczo2t9 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 onx, n*1tew p1gce end that will have a fundamental frequency of 60 Hz on a day when the vg,nxce p* wt11elocity 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 wher*go8yj5adr)(o /f b.tsyw9pk e 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:f1ixb-w hxh3 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 4xhmizy4p ;6 kof length 0.75 m is played when the speed of sound in air is 340 m/s. What iipm x;z k4h64ys the fundamental 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 yxi(i)d;y ;fp open and the other is closed on one end. If the fundamental frequency of the open pipe is 300 Hz, what is;ipfyxd)i (;y 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 ec 7 3zmix-8grfach 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 observer in front of the sources would hear no8mz-7xc fig 3r 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 p 7;0mz/is) )gyp pkpthh: cc:by the same frequency of 500 Hz. If the distance from a person to one speaker is 5.00 m and the person)/cktshzmp:) :h 70p; cip gyp 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. Whaui: her/: 3auva -6uh 0-icchqt 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 q6cxi8(ypwe0/oi( hhfrequency of a musical instrument. If the tune xpech/ 8 i6qyi(0(howr 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 soui3 5. d)vkv1c(wues;b tpzbo7nds produced by two horns are 6 m and 7 m respectively. What beat frequency is heard when the horns s.57u( vo;etbw ivcb3kz1 )dpare 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 2a qx ;6xc)dwutwo violins in an orchestra are found to produce 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 x;2 uq a6cw)xdbring 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 sourci k00 kdd-wj9ie at twice the speed of sound. The obsei9kw0jk0 idd- rver 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 frtdqo5z5 hesl0*u j(dws0b+3 pequency of 1000 Hz) approaches a stationary observer at one-half the speed of sounqlsb(ezpj t s 3d5*u0o 0+d5whd. 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 ml 8*qxoa ,g5u;bnq (i0o pftrtv1: cz5/s away from the source, what is the frequency heard by the observer? (Therbg 0p( *cau:;zx tq,1v flo5n85toiq 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 ps(); 4qeq3sn f+nnff u*eu 9em/s on a day when the speed of q93;(nfse)4efeuq+ nuns*pf 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 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 observe.u 6zhu 0u2m*mt n;cnazx2o2ar when a train approaches with a speed of 30 m/s. The frequency of the train horn is 600 Hz2m6* 2u naxnch0.u;om z 2uatz 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 .by.w j:g0mh s/rjdl(400-Hz whistle. Take the speed of sound to be 340 m/s. What . s(y /rwj:hlm .gjdb0frequency 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 train. The trai8 mptb5dk a4z*npug-: n blows its 400-Hz whistle. Take the *uk 5 ma- n4b:gt8pdzpspeed 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 al+mw)0wt ioa 6t 120 km/h. The train blows its 400-Hz whistle. Take the speed of sound to be 340awo ) 6mtlw0+i 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/ b+;q7yj8p br+ks0y3:kc xfwj(ojw*p 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 frequyoj+(bk pjbrs*p0 w;j 7+yx8 f3:cqk wency 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 thefabu4 fb -mrgb+8xiwtt 5 h3gq:4(* eb speed of sound in air is 340 m/s. What is the frequency heard by an*- m qfaure4wtbfbib5(bg4h: x3+8tg 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 the speed of sound in air is 34jr; 9 1+ms*saooh yr9rgbb(w6 0 m/s. What is the frequency heard by an observer if the observer is approaching the train with a speed ofrj(;hmoo*9ay 1 b+rrws gs96b 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 oop6j( ;x-ayz w txf/(sf an object. A 40-kHz signal is sent out, and a 42-kHz signal i/(yp xzf6(t a;wso-jxs returned. Assume the 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 shock oq9h5 2y;9f,n tsymbwwave 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 shahbwif1+ ;+ jbock w+; whfbabi+j1ave 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 to Euce0+fwp;n)g hrope with a Mach number of 1.05 where the air temperatw ng)fhpe+;c0 ure is $5.0 \; ^{\circ}C$. What is the speed of the plane?

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