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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 false*rwr 4be;sq p: 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 condu-:q waooh ,, )(biigdncted 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 so zc2f6oorsu(.wz3s uy0qx+1q und 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 velocitxlwu*a 8; )l pin/ dhnrb0ee,1y of sound? (Assume that all otlb1a /)r epwhi* udn ,8nxe0l;her 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 zrs yxx74ur79y7/8eewewu/ j velocity of a 200 Hz sound through aixrr7/ewy xsu974u 87e e zyj/wr 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 wavel undfn64am8s ,ength of a 400 Hz sound, the wavelength of a 200 Hz sound in8,m6 nuda4nsf 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 greateru,:1fslcdo4z60 dvm d 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 withjt9lbyl ls3 hte u4;73 frequency 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 emitting waves uniforml,t-sc oq-8t ne qwj2z/o x*(apy in all directions. If you move to a point twice as far away from the source, the frequency of the sound wil z,x8q-t-ot(sw aoqcjnp /*2el 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 vygf6v;ig(5( u f;upbow, h)(c b5qevto

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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 dww8d) u4lu76+h:lj9 nyj ssbhistance d from the source is I. What is the intensity at a distance 2d from thu8 :s4wu67hw9j+bd l)jhs ynle 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 distv nezapti*u9gg2 4)d 3ance from a sound source that is radiating equally in all directions. What happens to the intensity of the sound? It reduvpegt4 3z)u ad*9g2in ces 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 f dh7i57vt/ j9z4ec vt1 i4cfgab4z7mmrom a sound source that is radiating equally in all directions. What happens to th tz547vc4t1mm dfa/ 49ihi7jzebv cg7e 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 in:c. h )bss3tb zqdv8t+creases 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 speak 9nyt fnzzz;b22)n p.ger emitting a pure tone. What characteristic of the ;bftn2nzy.g2n9z z)psound 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" ousf1qh, ,; tehgi/i y9f a musical 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 /teow7d/ -amqvoe;2k 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 s alj2t;.2ubz 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 waves are.2rkerk1i 6ro

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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 t3(5pzsm jy) yihe guitar as a result of this vibrati35zmpyy( )sj ion. 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 e zdc-vjk5,3wo b41uarnds, 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 lengts.c+;b7abqvg h L. What are the wavelengths of the three lowest tones produc.g ;bq7s v+bcaed 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 og vcxcr,*f 6l)doepf 82bxk/)f the following frequencies will not resonate in the same pipe?)cff)bl c *xdr 2g8 kp,v/6oex

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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 it7n 7oqni- uuhbo q(/y*1j;whc s fundamental frequency. Which statemn 7c w7q-u(1bu jh* o;q/noyhient 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 b2)y.e4xkz iuone 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 of length L. What are theeynb6 kj9p7g; wavelengths of the three lowest tones produced by this pipp 6bey9k ;jng7e?

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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 Hz. Whichsynj;o v j0s04h,klq(;jah6o of the following frequeoq ,l0j0h4najks v s; y(hjo6;ncies 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 2ko nb- .dgx -fh38bcbone end is resonating at its fundamental frequency. Which statemko bbfx3g 82 .dhnbc--ent 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. Ee9n jvj2;ct+ sach speaker produces a tone with a frequency of 200 Hz on a day when the speed of sound is jves;c+9 nj 2t330 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 waver5m y xzkd uac/ xj19xc/2n(: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 togethvi;j)wp w.0jl3+e vvjer and a particular beat frequency is heard. What happens to the beat frequency if the frequency of ej3p+w.;vw )lj jvv0i 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 exp ;e8ehf2aq1zf cbq0 n0lains

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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 stationar edpvm: -ov)ql*x(j4f y observer. The frequency heard by the obse)- lojmvxdq( fe v4:p*rver 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 stationack 6l,ikpqlcg6hwu9mol33* ,/tb. u q ry observer. The frequency heard by the obsp3,bu t3k9 h.l6l c*,woqci/lq m kgu6erver 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 decrea13 d8e+ 6avzs-mljq afse by a fs3 1-vfa8j+zdle ma6q actor 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. -s5 wfel7d w/:xeh l0y What is h y7w lsew/5lfd-:ex0the air temperature?

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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 s1wia71.k.xd,*u nqw euja +n dpeed 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 a shriek whose0,gyhg6h71x(r74xa3fv sy asnuv. pm echo reaches it 0.0250 s later. How far away was the object u ry x0g 4va.,m gx1hahsfy 7(s63p7nvthat 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. 9me jd5vzt*m7g,1dqz 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 o 5rhyofl t*g+;f lightning, the distance to the lightning strfyl*5hot;gr + ike 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;e1phcr.oxbxib b( (e8y x)b3u c +7jd 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 well and hear the spl6 +pi9vy91 delcg6 nakash 2.5 s later. How deep is the well? (Ignore air resistance, and assume the velocity of sound is 340 +pl6kdca n9eg 6y1v 9im/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 soun5a6iw d51+hx s9xvkufd 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 8/ p9t/vy(c vk,kb jflat $23 \; ^{\circ}C$ 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 soun mil4p* webq0f 1cs1t0d 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 7zwa4rw55a7j t 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 intensities of two soundswj uq)(apsptu 3.tu9- with intensity levels of 70 dB and 40 dBpq tapj3u.)-ts(w 9u u?

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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 8pl b9j*kn.ejin a garage is 100 dB. What is the intensity l8p j*jle.n9 bkevel generated 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 sources 2:7u(jjn;)bpm r kxc that is radiating equally in all directions i nk (jbxm2u;c):pj7sr s
$6.0 \times 10^{-10} \; W/m^{2}$. 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 fromv/;wgo q/h ::3kufr ai a source that is radiating equally in all dv;k:ofw/qu ghi a/:3rirections 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 assum9eg k+p q-+xk yp5j4-2o rndiked to be uniformly distributed in all directions. What is the intep rkn4gp-2qd59-x + eko+kyij nsity 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 bamb) ij 2 i/jrklgp/*/crking dog. What would be the intensity level if two identical dogs very close to each otherbi )j *g/lcrk/ij /pm2 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 intensi160qi23cu-owuxi;9fo id e bk8o3 zojty level is 60 dB. What is the intensity level (in dB) at a point 2.0 m from the source? Assume that the source r21exiokdz bq3oco0wjf3 -o689iu;iu adiates 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 a4zulue/ qt0y4b0mu089t lhvw z7:j vn point source is 95 dB. At what distance u 4z we9/bt0tz 84llu:n0uy0vvjmh 7qwill 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 :itzt.(c;u mqwx:q4 bg0prq* has a frequency of 1200 Hz. What is the frequency of the fourth : g0qcqx *urpiw.4;z:b ttqm(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 is the lengmbr7*z ) muo3vth of the uvmz*3ob7mr)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 9ujmx,aniv t/)fk3g 6is 400 Hz. What is the frequency of the lowest tone that will resonate in an open pipe of length9,unmk6t v 3jfgxa/i) 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 h8:xi9 j : jey;niwk-zfas a length of 0.80 m. If the velocity of sound in air is 340 m/s, what is the frequency of the second harmonf:8 i: wjz-jxky;e 9niic?

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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 wher(+ kcy. 1;9evwgnpgpwe 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. ez o; r)v-/.thjl*skf x0e h,a What is the frequency ,v.f xa*e)tk hs;-jhzo r /el0of 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 pq 2lgs1(ymyw 60fcez5ipe closed on one end that will have a fundamental frequency of 60 Hz on a day when the velocity of sound islfq c6z205wymy g(1s e 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 0+uu7ikk p/8z9l k* jtro,dw:ujwz d6temperature 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 temperature islq8*jsy)rg1u,s;3 s4s czbs o $20 \; ^{\circ}C$. 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 0c (qiv9 icu0q5lmt9sz9)sn3n.75 m is played when the speed of sound in air is 340 m/s. What is the fundam cqli9(sc0q9 v zi3ut5n s9nm)ental 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 isj5lh f-)dtsuz h n ia6t2*z*:x open and the other is closed on one end. If the fundamental frequency of the open pipe is 300 Hz, what is thsz:dht n * tj)az*u65l2-ifxhe 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 of 800 Hz in 4(os6l/h,ivamcx9 cp air where the velocity of sound is 340 m/s. How much farther back would source 1 have to be moved so ans(,lipo hc6xc/49vma 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 driven by the sam 0-ju/vuikz8-jdap4u war3f( e frequency of 500 Hz./d8rpa kzuu(fia v34wujj -0- 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. What is the -dy aci0oo;9pz e6 weeve80ks(n 7g /ibeat 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 frequency of akh(658blpsg8agn4 l r musical instrument. If the tuner hears a beat frequency of 2 Hzg5kll phr (8agbs864n, 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 soun mgz wm;yidt8:c 1n/(pds produced by two horns are 6 m and 7 m respectively. Wha;: 1ti ycdnmw mg(z/p8t beat frequency is heard when the horns are 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 two violins in z)wvv.v4 iej9an 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 bring them to the same frev9iw z)v.j 4vequency?

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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 twicex6jfec2-l-( w,goocw the speed of sound. The observer hej fcwl ,6o2(g-xowce- ars 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 k,2s xnx;dt/ 9;0 bv, wgcgmd,riqwh) frequency of 1000 Hz) approaches a stationary observer at one-half the speed of sound./x9d dm;2g ,x c ;q0iwtgbrhsk vwn),, 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 Hzypba fk13q+k ,plj .o:. If a listener moves with a speed of 30 m/s away from the sourcb1,k fpy3q :ol.ja+k pe, 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 day when the 4hyw2(( /ekt ihvs+mxspeed of sound through air is 340 m/s. The car approaches ( v4+2tiws(mh/exh ykand 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 observer w*hx+ *.zhvc ne rgkv;0 dzc5b3hen a train approaches with a speed of 30 m/s. The frequency of the train horn is 600 Hz and gzvh.z * kx5e*v3bc0n;hd+ crthe 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-Hz wa--l9qx7uarag), bytc/ 5y t ghistle. Take the speed of sou)x -t/gtra7ba- 9 agq clu,yy5nd 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 stationaro9-ucyjl r. +ny train. The train blows its 400-Hz whistle. Take the speed of sound to be 340 m/s. What fl +r.un9oc-y jrequency 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 12*sskq 0uug 4 lrrx:5z30 km/h. The train blows its 400-Hz whistle. Take the speed of sound to be 340 m/s. 45*s3 gsxuqr z0 rku:lWhat 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 awayqtb(mzq8x+ q/ 7fzt17ak6o cu from you at 120 km/h. It blows its whistle, and you hear a tone of 400 Hz. Take the speed of sound ttqz 7fq8c qta/o167zkxb+um(o 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 train horn is 500 Hz. Assume the speed of sound in air wkp m 1g,3t2 76 s.tnfc-bpjq+fdr tn4is 340 m/s. What is the freqp7+3tcff,wnq 6- 12pg kd4 . tnrbmjtsuency 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 train horn ttf0:. cb sz*tgxp9-lis 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 xzs0g.tl t9:bc -f* pttrain 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 z i:s ( 0y8jh vagh,1rgr(l30p;q uoeuthe speed of an object. A 40-kHz signal is sent out, and a 42-kupr;eya(0v rzgsl ,go 08:hhi(u 13qjHz signal is 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 wave produced by a supersonickc5b:- dn (say 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 ) f-mwnnbdu q/xn0 6p+half-angle of the conical shock wave d/x0nfn-)wu qbnp6+ mformed?

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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 Eo;t. mtwp 60h -qv5hpvurope with a Mach number of 1.05 wm t.t56opv0hw-;pq hvhere the air temperature is $5.0 \; ^{\circ}C$. What is the speed of the plane?

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