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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 /e4z(ixk,c0z dgtkq*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 fasteswmrt/ prhd ;+,d0pd2vt 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 snr+d5 /z2m .xm p+2nkjf0d-7pleulkr teel 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 incp/0 zdugq p64ll/tg6jreases, what happens to the velocity of sound? (Assume that all other factou j/0z64tdg 6llgp/ qprs 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, theg/,me r l3;q)+ zgljtmikch91 velocity of a 200 Hz sound through air g9m ,m)cti/+z3gr1 jellkq;h 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 wavelengthw zae .rxp-f8( of a 400 Hz sound, the wavelength of a 200 Hz sound in awr(-ef 8ax.zp ir 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 u)ep mre*ng34 bmc2zoj l0,m-frequencies 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 freqd 5w*lwc-n t)z pox05fuency 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 uniformly in all directions. Ifgjqyp1 p8 1eg,)mqg ) o:8xrjf you move to a point twice as far away from the source, the frequency q1)qef),ryg8 j 1 x:gpopjm8 gof 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 prwf5;l7/ fuspu oportional 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. qn +dip994t; /8,sreeukroxvw*gr(m w8 qkb8 What is the intensity agm n+dr( /x89r b9r8qpke*4se;o wqkviw8, tut 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 radn kr4)h5rji t8iating equally in all directions. What happens to the intensity of the sound? It rj84i tr 5rknh)educes 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 in a5tqc3q;j* gql6o7y b --ljw epll directio6q-ewqo*jcpl 7; lbyt-j5 g3qns. 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 increases as a sound becomes lo* 4- awvm+zpxmuder?

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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 characteristic4njo-gjy .h:kpjjqwoi 42)tc(ydwsn h/)o8 * of the sound ih(gwp k4wiyj2 qto.n -ojy) :/njdh48)*ocs jncreases?

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16#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What determines "loudnw99q s)kbhfw8qr5mqgv ct ./ 9ess" of 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 hmo cm0.wg5w;l 1rh-inote?

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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 i)/k1-hdtvab.g.pl a 2td qm,h nto 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 wavp mzrvp(g +45mes 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 wce6(b i/ 1xmj18 arytgave generated by the guitar as a result of this viyem1j6bt/i(xrcga81 bration. 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 qi2mqq 9;r pzpca x9:l1l71zvh 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 w0.s6b m)yl4czfbu( j L. What are the wavelengths of the three lowest tones produce jbzf. 6 mybulw)c40s(d 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 rnsl:a/+fdg 8open pipe of length L is 200 Hz. Which one of the following frequencies will not resonate in the /8 ng+:sr fladsame 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 fundamental freque w 6r(lx-a+ 8noaz-gyoncy. Which staterln xo+ zywg(a- 68o-ament 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 a9i 4,/g6 knrj6fxo, bgelu8bht 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 q,m qb66bg c+96-u zmq ,zorjuof the three lowest tones produced by this piou,6q+qu 6- mg,cj mqbb9zrz6pe?

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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 20kgg1bjd lle+t) -o s3zw-g6( w0 Hz. Which of the following frequowzt3)b l + -(-s16kgj weggdlencies 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 fundamenth8 )-k1rrln ddp9yb8hal frequency. Which statprrh9bl-)d y8 8hnkd1ement 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 32g4hbtm7e1 9vg*su1l(, x j p jafh:f4vn rkpsame source. Each speaker produces a tone with a frequency of 200 Hz on a day when the speed of sound ism b r44s1p 1tafgpv ( fe29*xjgvl3:un,jkh7h 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 beats, the e3:j4/ 4 wk:qcp wfhkktwo 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 sounded together as:mb .a*fh)q jnd a particular beat frequency is heard. What happens to the beat frequency if the frequency qjsbm: )h.af*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 explains6yfalx 0s vr; f1qs16 cy4whq1

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33#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A sound source approach*f;1kqs k nw)res a stationary observer. The frequency heard by the observerf;kn w1r*)kq s 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. ot5 (xqg ,(v7 xwp3g(5n ldnap The frequency heard by the observpt(g nxd xo7vl(an 53q,pg(5 wer 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 h xh;/9zeat+.oyazt6 will decrease by a factor of:.o+/zxha za ;9teh6ty

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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 )/ f le/af r2euc(kch1*dqmu+jt 9q0u352 m/s. What is the air tem/ecl u*m)u2jd/u( fhq +9akqrft ec10perature?

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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 a jk74f8argvq 9t $0 \; ^{\circ}C$ 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 e t7xx+x 7mh -v* bv6zndy/0a0hbpky+ncho reaches it 0.0250 s later. How far away was the objecthmnv ypdvxh*y-7b nzat + /0kxx6 0+b7 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. The temperature isen*b11yt:bhz)d aj:q $0 \; ^{\circ}C$. 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 ses z(6cynbk: 7veing a flash of lightning, the distance to the lightningnb7c 6 :kszyv( 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 dal;,lpzr) 4/5cx),lj sh sroj hc1f3pcy 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 intoy4rqh -ug2j;z a deep well and hear the splash 2.5 s later. How deep is the well? 4;u2yr-qzhjg (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 so 5 i/ezjdz3-iound 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 ax ybe)juee*8p qk46if7 )rx 4cir 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 level of a sound with iny0zf4( t yk dg/e )yi*ip(x)uqtensity $10^{-3} \; W/m^{2}$?

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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 g0u5i) m ujyjkrr:d48 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 intetk +b2yk3a0yx+q l,q insities of two sounds with intensity levels of 70 dB and 40 i ,+atyy0b +kxq3l2qk 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; 7thf9x(p -3qen 4,ghuqgwmg garage is 100 dB. What is the intensity level genq-gmg;pgnw,qu xefh 7h9 (3 t4erated 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 that is radia;n7 f:u z +wntf+fyh+ sj4afl-ting equally in all directions f4-: fzjwf7nfu tn+s +yh+la;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 distanhah7p.l,i + p6:sjl crce of 6.0 m from a source that is radiating equally in all directi,i hp s+. 7hlcarp:6ljons 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 po5gs n(nfepj*.e8pa u(wer, which is assumed to be uniformly distributed in all directions. What n.8(*a seu(ppn5fgjeis 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 ba-d:f7lxds )ip rking dog. What would be the intensity dp7- isx:l df)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 source the inc chfrn*x+k6 cs nz p1q v45(0:xpuhuxh(2j;ktensity level is 60 dB. What is the intensity level (in dB) at a poinh(cv+ crq(* n01nxckj 642hpsukf;:5xpxuz ht 2.0 m from the 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 from a pows42i),;vzrqgmri4b /z7 4 /ttosard int source is 95 dB. At what distance will it be 7idi b/4mr ,7 t; ssortzz/qv2r a)g44w5 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 c3;uzyro1ir bnq+,h*gomplex tone has a frequency of 1200 Hz. What is the frequency of the fourth harr;hn,r u*gzqb13 i+yomonic?

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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(2 k63v 9ceol6sizcfh2fnfa5 an open pipe is 900 Hz. What is the lengf2v( ck 2 6sne63aficfhz9lo5 th 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 open pipe of let 8+f8ra3*kfb oo mr8tngth L is 400 Hz. What is the frequency of the lowest tone that will resonate in an open pipeorkmt3t +8ffr*b8oa8 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 bfkcjb9n u.0(l-s v;fd oth ends has a length of 0.80 m. If the velocity of sound in air is 340 m/s, what is the frequency of the second harmonfujkd cb.90l -n(; vsfic?

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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 rooeu733irn romh9c74 fe2 e;qm om 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 frequenckkmq+r k ybpi 4nagf)f2;oe1lz(z9+ 9y in a pipe closed at one end is 330 Hz. What is the frequency ofe(9i)kyrl zo;m+p 1knkb+fq4fg2a9z 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 closed on one end that will have8z4nvbb0of3 m a fundamental frequency of 60 Hz on a day whenb bv o4z0mn83f 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 room where e5i og(vk2)c mht++9xng ayr0the 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 isu/ .c7vg82dcg f;r b c8xwlx:eglu2+r in a room 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 of length 0.75 m is played when the speed of sound ima(4ow ub -:y5njfc5 bszq jx/3-u)o in air is 340 m/s. What is the fundamental frequenooa 5bxu f3n (4:yuc-/j bi)wjm5s-qzcy?

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66#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider two pipes ofe)*hkg d9g4ib the 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 fundamental frd h9i)k *be4ggequency 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 where the velocity o+er9 yr41+u tilgl: eyf sound is 340 m/s. How much farther back would source 1 have to be moved so an observer in front of the sources+y:yr gel9l tie41ur+ 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 pla *k/6i3 (b mjtzket5wxced side by side and driven by the 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, which of the following is a possiblk6*tbj5 e3 mi/zwtk (xe 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 frequenyc4js6sh .9l my*+mikcies 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 550c y3vsf jcl89.-Hz tuning fork to tune the frequency of a musical instrument. If the tunyvlj3fcc 8s.9er 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 are 6 m and 7 m rs,t b+9b1nyaqespectively. What beat frequency is heard when the horns are sounded on a day when the velocity of sound is 340 m/s19 a+qbybn,s t?

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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 onsp;6kjwb ;ta6 two violins in an orchestra are found to produce a beat frequency of 2 Hz when a frequencp;aw tsbj;k66 y 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 sourp ko us3g9bklx+x.k)4ce at twice the speed of sound. The obsekkb3k9+ps4 )ux og.xl 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 frequency of 1000 Hz) approaches a stationacdntb)hgf 2--62 iehnry observer at one-half the speed of so nc-fb)te2id2n 6h-gh und. 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 li p+bn zjy7yh-,stener 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.jyh zn 7+-b,py)

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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 -os lvu:6uh8sh 4bf0f 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. What change of frequency does the observer hhsh6 80lb :of fusu4-vear?

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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/ ay5s,t xmkt3 by a stationary observer when a train approaches with a speed of 30 m/s. The frequency of the train horn is 600 Hz an5/m3kx tsat ,yd 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 x40:mbsynx4 tm; 9x xpblows its 400-Hz whistlexyx p40 smx; bxn94tm:. Take the speed of sound 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 stationary train.z9d mq32s /jas The train blows its 400-Hz whistle. Take the speed of sound to a/sjm dz932qs 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 120 km/h. The train blow vftm ol6qt9y07z2qt 3s its 400-Hz whis7t9yt3tfq62v lzq o0mtle. 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 ) kshz.zu5-buat 120 km/h. It blows its whistle, and you hear a tone of 400 Hz. Take the speed of sound to b)zs- zk5hb .uue 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 tr 38co6 ykms/dc 0stofd+,toh1ain 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 away from the train with a speed of ofo8dt yok6cdtm0sh,13/ +cs 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 e 7va+r9af) 6fmywd 2mis 340 m/s. What is the frequency heard by an observer if the od7fwfrya m69)av+m e2 bserver 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 anz.51 jz m2zufa2p21txar ta ;j object. A 40-kHz signal is sent out, and a 42-kHz signal is returned. Assume the 2;zt f mtuzajx .jpa2112raz5speed 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 supe qs1/itpdgmy9p7yi9.9: mxxk rsonic 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 h ro)pf vcw(.ivt262kkalf-angle of the conical shock wave formedvvk6 cfi.()r 2t o2pkw?

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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 frod(ooz c xanx 9 /xfi:-mh(n3u7m the United States to Europe with a Mach number of 1.05 where the air temperature isxo /ca7un3-o9(i nmzf xh(xd: $5.0 \; ^{\circ}C$. What is the speed of the plane?

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