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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 fqt hl sq/90;iyalse 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 c m,ug i-6jr1q.r t es2ldwo21ionducted 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 a steel roq xwum op5dwg(nl(v*qo ;u6syh./ y( 3d?

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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 velocity of s mp pf(8uxpu40ound? (Assume that all otherf48x pmuu 0(pp 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 12t4ro q8(a fzuk dkrkx8y.7dvelocity of a 200 Hz sound through air 1t k742rx8fk8 okzy.d r(qduais

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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 o g5xc//-xozjiy 2ssz2f a 400 Hz sound, the wavelength of a 200 Hz sound in air czi/go xxjs/sy2-z2 5is

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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 greaterg..mpjw(ws yt1 pcf0( 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 are calle69des 8cou nqfa 0b8gc(jgc/1d

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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 emit 3m/bzu86s yxfting waves uniformly in all directions. If you move to a point twice as far away from the source, thybxf/ 8z su63me 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 dive80wn8i 5 uvycvo1v wl8rging waves, intensity 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 source at a distance d from the source is I. What tqf+l7p hbqx/0j t4x-is the intensity at a distance 2d from the sourxqh t0q 4/x +7f-tpbljce?

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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 radiava12whfjv; le8 .pa.qnle4* zting equally in all directions. What happens to the intensitew . l* a28fnl 4eh1qpvz;v.ajy 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 radiatingxhe8,i g (7ql7mo lzd5 equally in all directions. What happens to the intenghl8(5md 7xq, lz7i oesity 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 g6ch)eur)o w fj):ao*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 emitting a pdpue6 wq8,+ rlure tone. What characteristic of the sou,pde+lu 6wrq8 nd increases?

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16#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What determines "loudnevkq4zjic/y, e 5z0faj;d 5 tw+ss" 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 mus6m8lm w:y v)rvp1c*g8lhgq 3eical 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 mxw;(rs +) u:hihvv*tcrk2.e 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 amt 4 ely anq)0e.-nigax7 m).fre

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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 +qu -(fsu +id;c lkphlxd9v/,a guitar string and the sound wave generated by the guitar as a result of this vulv9h;dd-p cul+f,k+(s/ i xqibration. 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 : )dsc9x arfzwq,g834n kjj1vat 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 wavelengths ofg,)8 bfom)m: eccyb ;t the three lowest tones cmcye: ));g btmbf o8,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 lenzok61s9; ya-w+9zfz;irs vsn gth L is 200 Hz. Which one of the following frequencies will not resonate in the same f6 swza1 zssi+nv9zrk ; ;o-y9pipe?

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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 r9c )gjt fv :vt5a(io6eesonating at its fundamental frequency. Which statgfvi6a (v jto)tec: 59ement 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 cxcqs8apq-t,vs gmk *4- f 8i5glosed 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. f/3q5scgi*38 fc0szzuvnzzxnxu)8 of the three lowest tones proi 88*gzzx.vs zczscx3fnun5uq/) f 0 3duced 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 c46ax*gyi j3oelosed pipe of length L is 200 Hz. Which of the following frequencies will not resonate in that pipe?ig *j4 6xoeya3

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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 fz+w/kr k6 xnu-t7wex+r6sab 0undamental frequency. Which statemen wwnz7xx/ek + utr6+a0ks-b 6rt 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 same1h;hdk; slizvt g:+o3 source. Each speaker produces a tone with a frequency z:t;vh l k+sd;3gi1 hoof 200 Hz on a day when the speed of sound 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 beats :oqaqs q4e)2 )w2omkj, 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 sounded togethl97jet7 ;rcy6l o))g sfpik 2ber and a particular beat frequency is heard. What happens to the t7g;2p iokb)el) lys6r9f 7 cjbeat 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 explkbtomvp (;xn+3 1+ . rpdrdu,u6w8hz pains

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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 heard by the ouj-) taenu/c xp9j:idof 141cbscnij/1)ce:uxfoj u9 -a4 t dp1erver 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. The freieng o v923*y98aau eequency heard by the ov oea9gue*e 9iy8n3 a2bserver 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 z8) k0bxaovsw;3y+o sdecrease by a factorz sb xoyakw8+) ;3ovs0 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 f c;/m0vfvp:v zrequency 45 kHz in air is 352 m/s. What is the air tmcpv; zv:0fv /emperature?

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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 speedag; 8eo (e9ozh;:+r;6wld aryf dwp;x 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 shriek50739 s(/wa6bnl(z.pcpo ijtqm sbkq whose echo reaches it 0.0250 s later. How far away wap p35abj q.t7 mq 9olwicns(z6 0bk/s(s 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 gls i).bhu 9lpu-o+o9zb5y cg,li j :)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 sews4lewhky+a 42c :g 8reing a flash of lightning, the distance to the lightning striea :wh8 +sgwr2y4 4kclke 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 clifz;(c2ywgc,; yfhhz1x;d( i nw7xg+ syf 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 )nypb1 ddu yc8, qhmnz9 o/,,adeep well and hear the splash 2.5 s later. How deep is the well? (Ignore air resistance, and assume t hnupym9d,q,yd),c a8 zn b/o1he 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 wavq. v;rx d:l0rqe 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 at *fyb5bn0zo47 kpw ur ;$23 \; ^{\circ}C$ 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 soundhr;rq 0xe2et4 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 adu*.p.dfba d; 1+4fst grwe8p 70-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 intensiu/ 0gy9v z-2za8 fw1q(ke5nw2 uqnufwi:w*udties of two sounds with intensity levels of 70 dB and 40 dB?9 q0g 5 /wuknw1wf y-vid(*2 qa2weuzuf:nzu8

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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. What is the intenr m(4gky0hdn6p1sl2.kz 7 cwqsity levp7.(sh dky2w1 r lc6gm0nzq4k el 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 that is radiating equa0b 8qujyq v o6:3zlq9ully in all directions is bo0quvqzq8u369:lyj
$6.0 \times 10^{-10} \; W/m^{2}$. 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 sour vg0v, jqrv6.ju p85eece that is radiating equally in allqe 6v g5.e rjvp0,u8jv 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 uniformly dis(d/v b7f8shg ltributed in all directions. What is the intensity level at a distance 5.007s l8hgd bvf(/ 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. Whk.9e *bypss 0xat would be x. s09e kypb*sthe intensity 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 f kr*s1mm7k6mjdgles-x- 2-p the intensity level is 60 dB. What is the intensity level ( -ms7jfdk21 x g-l-erpk*6s mmin dB) at a point 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 an)emr f/k) hj*ysm/u 5 point source is 95 dB. At what distance will it be 75 )m )/ k5ejnmhuys/rf*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 qvs gbchk+;a01g4j5 z2; de kfof 1200 Hz. What is the frequency of the fourth harmonv4 0 gqek+c51ghsjabf2d;;kzic?

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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 h ;z,gu50 siyga) 20m3puowq jbarmonic of an open pipe is 900 Hz. What is the length of the g mya s2 3qo,ujp5bziu;g0 0w)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 lek (bsk2j6ck :pngth L is 400 Hz. What is the fk26j: kcsp(bk requency 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 the velocity ofvw5xseib/ oq. vh625e sound in air is 340 m/s, what is the frequency of the second harmon 62.xsvb iw5o ve5ehq/ic?

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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 wher7ye3soc2yuy- ytj+x ) e 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. What is the - wc .ei1:m+ghjvhmd)frequenchdc em:g-h) j i.1vw+my 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 ouyz3)h )ak:i ff the shortest pipe closed on one end that will have a fundamental frequency of 60 Hz on a day when the velocity of souu:)ay3zhi) k fnd 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 y ehiq2/c8 :zs -tg;prt0,doiwhere 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 qnjdr(q- c*/a 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 pl2iqaegv4)p 4j :zze8 uayed when the speed of sound in air is 340 m/s. What is the fundamental frequency?j4eaq24i e z u)8pgz:v

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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 open and the othp9jyh.dv4 kw )er is closed on one end. If the fundam9y)j pd.wkvh4ental frequency of the open pipe is 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 of 800 Hz in air where the velsc5t99p7,-2j eiwll awi n+ bn2eplj; ocity of sound is 340 m/s. How much farther back would source 1n,lw9 b2 7p w ljpci;2 9ljtse-iae+5n have to be moved so an 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 scfw192s with:ide 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 followingi chf9t2:1ww s 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 44420qmdf lk ,q h9fvhpxg.l/mm /+ol-t1 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 550-Hz tuning fork to tune thevyhsf1em 2,u. frequency of a musical instrument. If vfs 1,y2ue.mh the tuner 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 si x0sr ;tvttmdf3m 42:ounds produced 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 velomvd:f0 tsm r3t;ti42x city 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 violi ,ead- r k)d vvf33z9,v7lnqesn strings on two violins in an orchestra are found to produce a beat frequency of 2 Hz when a fre)eslv rek 9-nz373af,vdvq,d quency 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 sos e f;3ez ;mchr0 j5ppz/a9xp:urce at twice the speed of sound. The observer hears a 39 fj;;zhze: preaps5 xc/0mpfrequency 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 stationary ob;al .pcoem;4wxt dd8::mdnw ;server at one-half the speed of sound.m:d8lnwote ;x;p.m: da dc4;w 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 dnn3b7ud:+/itr lfp 3of 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 sp pln3dr/:+uf t3i 7nbdeed 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 ,sq tl 19e-57,ciocbb ou j2fpwhen the speed of sound through air is 340 m/s. The car approaches and pasi-u q osj,p,2 9lftb5c1obec7ses 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 hma:2l;oy )q toa*d+d beard by a stationary observer when a train approaches with a speed of 30 m/s. The frequency of the train horn is 600 Hz and the speeyda+m :b o2odq)l ;*tad 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 40o,n 3oma3plx,gsd9 q9ob 9uq50-Hz whistle. Take the speed of sound to be 340 m/s. What frequencyn95u9,9pqabo 3 o ol3,mxdqg s 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 trai*tb) nl0o.f hkn blows its 400-Hz whistle. T0n .b)tfok l*hake the speed 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 at 120 km/h. The trainmpzt)+w 214i)q jktfj blows its 400-Hz whistle. Take the speed of sound to+t) 1j i)ftzj4kq 2mpw 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 fnek/.2 d nj5( cqeaus1rom you at 120 km/h. It blows its whistle, and you hear a tone of 400 Hz. Takenadec(2nqje 5 usk/ 1. the speed of sound to 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 k4gb 3ooc9 :ky . )4)spyfhodpair is 340 m/s. What is the frequency heard by an observer if the observer is moving away from fyk h:oy4s4 d)ko g.b)3op9cp 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 traw f3u0a,kms: 4ty0*zghlcqw.dtwz)0 in horn is 500 Hz. Assume the speed of sound in air is 340 m/s. What is the frequency hear.wwwt ck,0dq :z)3s0fy gal h40ztm*ud by 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 obje*6my hb .bnoebarx8-,ct. A 40-kHz signal is sent out, and a 42-kHz signal is returned. Assume the speed of sound is 345 m/s. How .b 6h*b8nay m ,xbroe-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 gps35 puqw:4q9jm 34uq19yfqf ztv:k 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 conicalqz x/n/g5ct 2c shock wave formed q2nc ztgcx//5?

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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 Europe with a Mach number og xca .c/9b6y ywp(mg5f 1.05 where the air tempmp5bgxy( w6y ac/.gc9erature is $5.0 \; ^{\circ}C$. What is the speed of the plane?

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