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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 d0ul pl6 -(*ny q7:ny: vcyqzkstatement?

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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 con ; 4hcxjb,zlvacu;17 rducted 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 rod?c/.r c8t k7yyj

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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 the4x+ g 2ezk3)l+ yful)niikt:q air increases, what happens to the velocity of sound? (Assume that all other factors remain const:lxk)ig4+ez3uin f qlyk) +2tant.)

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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 of3cx z*ro f;d :q2v8miqhzhd-7 a 200 Hz sound through air i ixm7 ;fhvzh*qd8qo3 :dz2r-cs

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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 of a 200 Hz soundp *)sylncg+spi/;pk/24f ber in fs;ly2n4p+cegkpi *r p) /sb/ 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 frequenciz8y)u -fwuby6qjj +v.m 5mq/qes 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 (mqjeyiz/ .inf623 bb2 c3fg b20 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 direc12wa kwt; 4ysptions. If you movesw24yta 1k ;pw to a point twice 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 divetr6iee : e5 v.k+hj7pzrging 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 s hcx;.c9j:ch tource is I. What is the intensity at a dista: j9xhh.t ;cccnce 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 is25kv2m ,yby1ydovx b q6mv1(t radiating equally in all directions. What happens to the intensity of the sound? It redukm y 2 mvq5vybvb yot(x12d6,1ces 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 sou 5rsh38 7dgfkn1 wxxp(k r(c)qrce that is radiating equally in all directions. What happens to the intensity level8k kqxpr( c(dgfhx3s)r5w7 1 n 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 sound7ph /ccdevq(l-7hy-h 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 aw1ccvws lbep+ f:* n l,jw67-pure tone. What characteristic of the sound incr:* fcjla6w-7l, w scpwb 1+enveases?

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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 no c r)pc, ;)qrssi68grite?

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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 m rg,4+/yial neusical 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 air5 wwbmfp77 5)tujvfy9 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 t6xs+q)1 bsfmbi-z7 pare

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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 thei;:po:o8qz8t,.e gb 2wvao5jl, j3d zq+ocwc sound wave generated by the guitar a,w5jca8;tz 3v gqqopoe:,doo+z8b.w:jc2li 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.b.l k+c;cee t 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 ofjy-b/yoawb/gh ;h0 /f the three lowest tones produ/bf a j-go/h;yw0y b/hced 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 reson1 pq2v pfy5yqg;e:sw2ate in an open pipe of length L is 200 Hz. Which one of the fo ppygws;v qq5y1ef22: llowing frequencies will 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 fun, .1 hmscsk39l knye5o5c3z mmdamental frequency. Which statement is cor okm9y 5scs.m1n lk35 ,zcm3ehrect?

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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 opx 8-3sfttqw z:en 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 the three lowelh)espbh,q4(k6n a,z6w1v/ k6 5kyrebn .lub st tones producbqk4ek56e( pa6.wy s1hl un,bnrbh/ l vk6z, )ed 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 a7f6h4t ebsc n* ;ld4pd closed pipe of length L is 200 Hz. Which of the following frequencies will not resonate inldshc7e n td4fb;6 *4p 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 closbd / 1iv(jav6med at one end is resonating at its fundamental frequency. Which statdb/v ia6m1vj (ement 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 spe,4djf ep62yrozrn/ 6sakers driven by the same source. Each speaker produces a tone with a fs/4oj,rp d62yfrne z6requency of 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, the two sound w(xl4 9t;dduq tlrru06aves 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 particulayxk 17n2wwg5t r beat frequency is heard. What hy7x12 wwt5kg nappens to the beat 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 explail/y5 0u.qwql fb *af/ons

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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 obsgj vocf nbz;d*+0qr(6erver. The frequency heard by the observer r( +b nqv;zf*jg do0c6is

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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. ,pvbz 3cuz27o The frequency heard by the observer is vzb3 27zucpo,

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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, it.d,9zqet7kqw n . i)tws half-angle will decrease by a factore7wt)i qq.kt ,9 .wdnz 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 ultraso iis- mi :bx3,y/zrjl0nic sound of frequency 45 kHz in air is 352 m/s. What is the air temperature3l:-bm/i i0sx jyi, rz?

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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 ,(hhmtv rbh( sw-lu1 3d y:1c.)bgmsdt $0 \; ^{\circ}C$ 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 q9ud0myuwie,zf7xj .m 7/ c2zis 340 m/s, a bat emits a shriek whose echo reac,7wqzd.uxuz m j f/907y2c meihes it 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. Thfnjajls 1e( jna73+d +e 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 of lightnin dnr8: r)jllux *a)d ))i(oizqg, the distance to the lightning strike is about in:(ri * l)auxr )l8zqo)dd)j

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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 the temperature i6sx5 wh ,2q0o hdq* m3vceyoh7/sj cd)s $15 \; ^{\circ}C$. 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 welfk3 3/ h/e: k zltujphputd))7l and hear the splash 2.5 s later. How deep is the well? (Ignore air resistance, and assume the velocity of sound is 340 :tpl)e7/)z3hj ukp/udh3 kt fm/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 wwdvhig1g,f .n. 0sih ,ave 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 a hs/s 0.r- inhsloen+,t $23 \; ^{\circ}C$ 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 s d3myz) ; na,-gz*qoquound 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 7ivxc7dbh+ 3i j85/p/dfy w v(d0-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 sounds with int1gayoqj g dso+,-7 jxu3umm, i.z8a:jensity levels of 70 dB .oygj7ou3+g8:zj1s u-aj mad,xqm, iand 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 a garage is 100w. a)tbjhep:4ynt3 dr/+ t d:n dB. What is the intensity level generated by onran: t:dy.+p)w hbtt34j/dene 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 equay/d4vz47v1 g rs4o8*rk:d yf qk0vwvn lly in all direct v rq nvsdz0rk1g7of 4kv *w4y8:4/yvdions 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 6.0 m from a source that 3xa5dsg ./+a f*trio s jw2b7xx) iro4is radiating equally in all direotb)oxijd/r2af* 4 awxi sxr.3s+5 7gctions 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 vxi:nlh;l() q:lpgp (mW of power, which is assumed to be uniformly distributed in all directions. :pl( (hpll;iq) :vx ng 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 at a disy 9*kof7q/ai6lish ( ,qpo4qftance 5.00 m from a barking dog. What would be the intensity level if twlh 6 /pk*sff 7,qy4iiqo9a(oqo 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 intensity level isen iv 3ap q5)r8c12ewa 60 dB. What is the intensity level (in dB) at a point 2.0 m ei1 r5aa)p3wce28vqnfrom 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 point source is 95 dB. At wh6v5p561e nuue ll7ppzat distance will it be 75 dBp pe67v p5e1nll 5u6zu?

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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 of 1200 Hz. What is the fr pd:8ssu5b h3/pcg b0j5;ib s8b 5a5a5sigjd yequency of t5ij3p;sb8di5c5 0ja5 b 5ss ub/ yb:a8sggpdhhe 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 open pipewx5u-3xk-uu 0/zzrri is 900 Hz. What is the length of the pipe?u/3r uu-5kzirzwx x0-

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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 opc ydcz 5ypk a(i121oa5en pipe of length L is 400 Hz. What is the frequency of the lowest oc1z5ai 21 dyp5yca(ktone 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 endtrx0z, +(zxuyx iu7+otz5y w) s 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 harmoniz7wuotyuz +x,+t0(r5z )yx xic?

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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 temperaturj ; gxmc5l;1ine 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 onku r 3igh6,5ove end is 330 Hz. What is the frequency of the tvohirk,5 g6u3hird 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 havgdy;v 9)t ppx,e a fundamental frequency of 60 Hz on a dgv pp ;),ydx9tay when 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 ihl8 7aev/z2pfb2jsw * n a room 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 ww*qncoj k65h (;z/x qkhere 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 b;.hy;x l6ckp 0.75 m is played when the speed of sound in air is 340 m/s. Wh6.c l kh;;xbpyat is 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:z mmp17g k0 ,jho8ax(b 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 frequency of, 0 1b8amm(hpk7x ojgz 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 eac) :bgt4jl jki+h emit a frequency of 800 Hz in air where the velocity of sound is 340 m/s. How much farther back would source 1 havl +j4)bgj i:tke 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 side by side a sc w+ 3:+pkfyf7ng l4tanz4(und driven by the same frequency of 500 Hz. If the distance from a person to one speak 47 cg y4+ flunzswn3:tkp(fa+er 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/zebq:v8e)gh(k8v/ ao a; wy km 2mx g(ud1fg3 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 550-Hz tuning fork to tune the frequency of a mu k dbbb943sti2sical instrument. If the tuner hea b4 sk2db39btirs 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 a ep*ib9nj,h u8/ affch.h+: ymvvy)9are 6 m and 7 m respectively. What beat frequency is heard when the horns are sounded on a day when the velob8na)h*vy.i9cp/ jh+e:h9fuva ,yf mcity 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 orchestrao, (d(w uh/g g1(v9q9fgz yciy are found to produce a beatg( (vq oy 1cy zfiwu,g(g99d/h 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 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 sourclim e8hw h.(ay y9z**0;aztw/z.trg se at twice the speed of sound. The obs.e .rwiawz s9;gh/**mt 0lyzyza(ht8 erver 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 1kgj.l0u(eo 6 c56 ; +l8hldtnnmq wb/w000 Hz) approaches a stationary observer at one-half the speed of sound. The observer hears 05lqlwl/ kn ub(68dwnct+6hme.;ojga 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 witl rr3md04;lc :sxqv 8th a speed of 30 m/s away from the soud;l 8:crml 034qxrtsvrce, 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 travelgcwfept0s.d qb :481ring at 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 dfwp81sdbq .ct 40ge: roes 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 sthzrblck yu9 ;2.cvr,3ationary observer when a train approaches with a speed of 30 m/s,hr.u2b lcz;9ckyv 3 r. The frequency of the train horn is 600 Hz 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 kwu y(qs 8pv(/lm/h. The train blows its 400-Hz whistle. Take the speedl 8q v(up/wsy( 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. The train y3(ov mu0th5q7*f ir bblows its 400-Hz whistle. Take the speed or0qfh b yumv (*io573tf 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,q7jn fxk u7q, at 120 km/h. The train blows its 400-Hz whistle. Take the speed of sound to be 340 m/s. What frequj,uf ,x7q7nq kency 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 traveling0p d-obkm)4 ev away from you 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. Wha-4 peb)0kmvdot 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. Aso5o*;bv*z.c hc 9ac69yhhuyg b85 g ypr.hgm4sume the speed of sound in air is 340 m/s. What is the frequency heard by an observer if t89* hg 5cozy56huccyho.*gr49phb;vgbma .yhe 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. Assyem p0oi,uy2 + 35pzmdume the speed of sound in air is 340 m/s. What is the frequency heard by an observer if the m+my35y2zp i epu d0o,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 dete8nlxqm, v,4xxm ww(1 crmine the speed of an object. A 40-kHz signal is sent out, and a 42-kHz signal immn( xx,vclwxw4q ,1 8s 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 supersonic aircraft /ip t9qs bc/d+7 ogyq:srz3*q 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 o 4oldugq/4b)dq ww(9xf the conical shock wave foub/ lg4odqw9( x4 wq)drmed?

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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 to1kd,4o-57j9momcee w/r c vlb Europe with a Mach number of 1.05 where the air 7om 5vlcjrw m,d4k/c 9e1o e-btemperature is $5.0 \; ^{\circ}C$. What is the speed of the plane?

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