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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 statembvxru683u5z)v hcuu9 .n r; 1sz*pqdqent?

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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 fastes:e:aa,:zn*k 6awzsj y :cv )4puu- tuvt 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 a / e2u ftsqciy:v2q -7fsteel 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, whz 7ljkq6f0 z6)7 eawdxat happens to the velocity of sound? (Assume that all other factors remain consx6 jzk l6a7wqz)0e7 dftant.)

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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 s rxnne:9mdxo8 6v +gx(ound through air i+ 6x xvnem8gd:(nx or9s

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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 o.t3d l tz5a3gxf a 200 Hz sound in ai tadz35xl. tg3r 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 arlve4)/5qkod d1)f ,z91x vwslb,l nyoe 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 les a kk,3ullw7t1s 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 all d wvwcv4l7dmm 8zwrl5fm2sr906 -oa+u irections. If you move to a point twice as far away from m4al89mr56dv w s+ 2clv- mz0ww7ur fothe 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, inten3 1inizupbg82lyq;8 6bs6hc psity 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 soup,x ay6(, sejq);btvj rce at a distance d from the source is I. What is the intensity at a distance 2d from thaveq tj s6pb,;(,j)y xe 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 equuhbz ik0j(iuk q( gj;,( (i;ssm,*yeuf9-uslally in all directions. What happens to the intensity of the sounhu;(,kf (isue0y u* i9 ljbq,(s-j(s gui; kmzd? 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 radiating equally dn+4 l*j drk*uhyzr:; in all directions. What happens to the intensity level of the sound? d+j*;z*k hl y:drr4nu 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 lo 6*n ;exguzm1vuder?

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15#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  You move slowly towavw ms krb+) :w /fxk-el02kru:rd a speaker emitting a pure tone. What characteristic of the sound increex/mswr:u +w fv: -kl0kb2kr) ases?

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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 .q uqyp/l(e3a 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 musica 3pglzuh)iup 8ln4 z+(l 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 airzuv x+kmf/5s, 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 waves ap9vrrnd/ly2 ;z,jk o;re

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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 qo,krc; hr7799v ;ubmc jb8wgthe sound wave generated by the guitar ar;7 ckb7cq ub ho9mrvw9; 8gj,s 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 e n-z8vnlneffxz2;a nxh18k1 * nds, 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 gcd1618qbdr c,p0svs wavelengths of the three lowest tocd8 sb0 gqp1,r1vdc 6snes 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. Wh3xa 8znig8w,wwagtak;cg5 kr/ /h-v6ich one of the following frequencies gckga-w6 gv5 8nazi /h;w a/ r83tkx,wwill 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 its i2is,+y7ow. a iyc ;)n5tuz qgfundamental frequency. Which statement is correct.s)7+ocui 2yi;5wni taq y,zg?

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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 wf:peq9 1f: pj4dbfcm np7r3i(w5b2o mhich is open at one 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 the wavelengths of thewee /dn+ 4q1-ajxv3 pr three lowesrp/+ eev41aw3xd nj- qt tones 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 resonate in a 2ryp5g+t2 w nwclosed pipe of length L is 200 Hz. Which of the following frequencies will not resonate in th y2+nwr2gwt5p at 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 resoki5 qy45dag6f ,dw-gunating at its fundamental frequency. Wh- gua5kqf5y4 d6iwd, gich 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. Eadhy /bq3 ihmig,0zv 5)33haqach speaker produces a tone with a frequency of 200 Hz on a day when the speed of sg,q3bq3 mhh zaa3y 0/idvi h)5ound is 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 b gqls rtmap6 4bgp,*x 5x1)-l(ev+itneats, the two 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 soun va5s)f0 ad(uwded together and a particular beat frequency is heard. What happens to the beat frequency if thvfs(a) 0uaw5 de 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 explains.njc lw ;64mcjyib4 a*

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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 frepa(2 ysgy,st ;quency heard by the observer ia;2y ,typs(sg s

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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 frequency hl yu62vt ot2r*eard by the obsert*oy22v rltu6 ver 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 MACrx.lscr:p6dzzi4n3j*4 -a vbH-speed, its half-angle will decrease by a fact n pb lr4z.id:z4sv*r6a cx-j3or 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 aireff cnp)bo5tx,-e junihg1 jb8 9e/g,sm*v(* is 352 m/s. What is the air tempe,x9g1e)jv -gmfe ,be * ncp(58htjnobufi*s/ rature?

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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 ofw5fk ,7duf)djg ;c )yf 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, ff7:r-a0cg ej a bat emits a shriek whose echo reaches it 0.0250 s later. How far away was the object that reflected back the souna0eff-g 7cr:jd?

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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 thwzel zc2 m+w:7e 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 :2sbkaq5 r9 rhs after seeing a flash of lightning, the distance to the lightning strike is ab:9bk rrqa2s5 hout

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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 oyfsxh ng -h2 (/hni(:zn 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 splash 2.5 s later.nh373j7 upo cukmdp14d:c )u f How deep is the well? ( 3n)c p:uo pcfhdmd3j 1u77k4uIgnore 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 wab, wr)5)n3/ m fzvezbqpy8 ,v35pc qlmve 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 aivm(q f37oqro- zc4ym1r 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 levejr*v*3)cduj uvmo4 ffn; /sh- l 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-dB so(vu7 3lpaef mc;3rr)b und?

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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 withj.. 2kl8r iuzw intensity levels of 70 dB and 40 zwjk2 l8.r i.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 zsc 58uum-x1 .hh4ajf3pl 5dzdB. What is the intensity levelfu5.53hz 4zpx1u8a j -dlchms 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 source tha/tnya.e7h(x hlxf:g4 t is radiating equally in allh(7:f/hayxx4tg nl . e 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 dist d7zbe08wvlo 5ance of 6.0 m from a source that is radiating equally in all directionzv58l0edo7 wb s 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 uniformly dis lgrgfc6+1/ l8oaim,xtributed in all d,mgrg l1 /l oaic+8f6xirections. 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 atv r6ccs x;.7qee19 6x7s ujvnp a distance 5.00 m from a barking dog. What would be the intq66 cv vssn7xp.1 xeure ;79jcensity level if two 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 sourac we z*, 5 ,z)(1ac+p(xmduxytyz;:xqg-un hce 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 radi*m u ug yzzza(x-w)t:c,1,;yep aqcd+ xx n5(hates 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(zbcl. ,;hibt n a)u4r.0 m from a point source is 95 dB. At what distance will it be ,;(binzb.r)4t lca h u75 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 p;ic0n tn 0yi2a complex tone has a frequency of 1200 Hz. What is the frequency oti0c20y ;pn nif 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 harmoi- io+ vjc9ttao ))if-nic of an open pipe is 900 Hz. What is the lengtvtt+)- co) j ofi9ia-ih of the 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 openkx13m7 g1u ikx pipe of length L is 400 Hz. What is the frequencyu 1xxg i3m17kk of the 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. If t80/g(w ea l1netat *rzhe velocity of sound ia(e1g *a8wn z lret/t0n air 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 temperaturejmb0 yi, y v3 /8,(a3areaufyb 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 frequen bj3-qc8 uvog)cy in a pipe closed at one end is 330 Hz. What is the frcbg )-jqou 8v3equency of 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 shortey35; d g:wjc/f 7btwlxst pipe closed on one end that will have a fundamental frequency of 60 Hz on a day w;3jwlxybg : td57cw/ fhen 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 in a rooht9-d d:mtxd)9 ddn+a m 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 the temperatxdl:/. pro;s9 /rr w7d 9mcg7y:rw phjure 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 of sound in air*jyekr/-7 foaqmud (bg/ i8ht +h.lz8 is 340 m/s. What is the fundamenta/ kb h .ay8mojlrzu-*td(+i qe87fh g/l 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 6x7q9t+w 9 lmhva0cct same length: 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 fundament9 x l6tacwh0q9tc7v+mal 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 air whiqngy,r2s(ku,h tap +p,otm ,9 qt ,*kere the velocity of sound is 340 m/s. How much farther back would source 1 have to be moved so an o p(m iq pungta hq,*2+ok9k,tty,,rs,bserver 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 same tdi,+ogh q,*7zcssc0 frequency of 500 Hz. If the distance from a person to one speaker is 5.00 m and the person detects little or no si 0,cs7gs+qt ,ozc*dh ound, 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 j n.6 f(s*nwws bp.if7tgc9)f wzz-2fand 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 m//woc u o7nt*czc1o. 550-Hz tuning fork to tune the frequency of a musical instrument. If the tuner hears a beat frequency of/c*o. zo/ t1mcow cun7 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 producejf*+rdx cjm+*d by two horns are 6 m and 7 m respectively. What beat frequency is heard when the horns are sounded on a day when the veloc x+fjc +**mdjrity 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 fon djx3 c2b1dq*k czb84und to produce a beat frequency of 2 Hz when a frequency of 660 Hz is played. What percentage cdcjzxk8* c13n4b2b qdhange 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 statiok/p9n5jz xc9 vjt b.*snary 1000-Hz sound source at twice the speed of sound. The observer hears a frequencyk /nbv9ptsjc5z*j . 9x 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 om+ ) )a7jo8re yr(dvacf 1000 Hz) approaches a stationary observer at one-half the speed of sound. The observer hears a frequed+ay(7 rr m joe)v)ca8ncy 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 H i;gxpxip 4u;3z. If a listener moves with a speed of 30 m/s away pp;u3 gii4; xxfrom the source, 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 tq 9 ns+./dxrdlhe speed of sound through air is 340 m/s. Thdsr/ln 9d.x+qe 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 observer when a train y ak yrh1n-dc19l gt.o;2ab.eapproaches with a speed of 30 m/s. The frequency of the train horn is 600 Hz and the speey9grbk d.. a1 y2;chl eat1-nod 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 d / p /:fo.kpjspeg.6ay)xajc 98 zqt/train blows its 400-Hz whistle. Take the speed of sound to be 340 m/s. Whaj./ ) xta//8kado p .6zjpqy 9cgfes:pt 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 stationary train. The train blows i vn 9 ,u)msism3x**fg nn)(hftts 400-Hz whistle. Take the speed of sound to be 340 m/s. What frequency do you heguxftns)3n,m s )nvhf*9 m(* iar?

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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 rh8vq;n4z dm( from you at 120 km/h. The train blows its 400-Hz whistle. Take t4(z vd8mqn; rhhe 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 yino5a-wrf ya(d+bxyqn 4c yb3j a)1q9*h )vw*ou at 120 km/h. It blows its whistle, and you hear a tone of 400 Hz. Take the speed of sound to be 340 m/s. Wj 9o-hiy)4nydby aqxrn1 )*(vw5c*wfa3+ ab qhat 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 thhi4ux6, :dld hd-bymh1pxb -0 e speed of sound in air is 340 m/s. Wh dyi :16b0lubx h-x -mh,hdp4dat 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 train hwc:+(ug g dpf+orn is 500 Hz. Assume the speed of sound in air is 340 m/s. What is the frequency heard bygu++p( fc gd:w an observer if the observer 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 determine the speed of an object. gxx,-nt1f9 f4e b-wb f i;(zgg 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 objbfg 4b;1 ,- (nxw9txge-zgi ffect 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 sui6p87ew mu4a, h+ur; kq qb1ybpersonic 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-aduziy ,o 3q of9/0z4m osp15lewn)a a*l4 g:wingle of the conical shock wave fo,awwuyn5dsaofpz0gz:9*m 4 3i1o le qo4/ )i lrmed?

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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 fromky0an llx;xo;;7: vsc the United States to Europe with a Mach number of 1.05 where the air temperaturl;7l;ko;:0ny c s xvxae is $5.0 \; ^{\circ}C$. What is the speed of the plane?

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