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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 fy uj6(xt0ft1kw v m* .n+6 pkmiyjlm5;alse 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 con:o),yd 9axpda ducted 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 8 w5u66+j8 qn xovhx59hfhyy-,tfv ke 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 velocity jjo 4 hj5kuyqa01tr *zl f469aof sound? (Assume that all other factors remain constant.hoj4 k 1fatl5z*49jquj60ay r)

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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 o9t yzw9cuq83sound through air is899wcytoqz3u

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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, 5js3k5j .unb ithe wavelength of a 200 Hz sound insu5 njk. b3ij5 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 grx2. a-+qvcdt6:nbw eq z: dfw1eater 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 cal70e ghisb8n4ma z /fu7led

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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 wavesgdazl qa qp jshfz1p(r5c7eq )13j. /: uniformly in all directions. If you move to a point twice as far away from the source, .l) h1j/1qaqzp j a ge:zfc5qdprs(37 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, intensity is proportia :4s:w o,9bgtxv6hraonal 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 tz r9g /6ao(bqw)xmf(c kpvs,.he source is I. What is the intesv 6(o ( xm9f ,.zc/)arpbkgqwnsity at 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 fs:qh9 /a v r-)g;fk u6i;buglsrom a sound source that is radiating equally in all directions. What happens to-q:svrlg ;h)us kbf9/;u6 i ga the intensity 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 h-(/agrvx f /hsource that is radiating equally in all directions. What happens to the intensity level of the sound? It x /-(hg/f harvdrops 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 lob 8nfwr urrp4umw,*b 1 )+z7rgj 4efb(uder?

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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 t l.lkkak4zrz 0 i +--0vvkpgglcs7.n. one. What characteristic of the so lz-aipkvl 0l k.kc7ks.v0g 4.n zgr-+und increases?

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16#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What determines "lou-5 i l74h8ga 7tq*somztbodkeh2dx(mi+;* q idness" 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 notq ;q(hr0pd o,se?

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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 airw4i+ g /p)gvgo 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 71jp8jd4 :n u6r8dlmp+,i lb3jnfcp .;atgziare

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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 generate*d (x,unxy 7jhd by the guitar as a result of this vibration. What do these two waves have in common?xhjd*,xy (7 nu

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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 o cp59-x m6eziopen at 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 arv3c *)lic3e1toup 4ttjq-gyq fz64 l 7e the wavelengths of the three lowest tone f 31qtpo)7czvcqi*j3e4lttly-u 64 gs 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 ll 6zu-pe ob3-:a l,zibength L is 200 Hz. Which one of the foll-zpi 6bul3e, a:l zbo-owing 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 reske08;w1 qmpwg 1+x2x*ew rgk8owjv 1xonating at its fundamental frequency. Which statement is xeq*w2xg 8+pg1 ox 0k evj1rmw18kw; wcorrect?

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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 closed at o..6m a1fw lbithe 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 kg d1k lmo41g8wavelengths of the three lowest tones pgo kk1dgl 1m48roduced 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 closed pipe of length L is 200 Hz. Which g2 owi4k)wmn7 bab39o of the following frequencies will not resonate in that pip2bw4kg nm73obaow) i9 e?

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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 cloc u 8mj;* o* 7*lh4wrtzesx3aysed at one end is resonating at its fundamental frequency. Which statey*zr*wle j s uhaco3* t4x7;m8ment 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 png/ dcr)t,t/q b2bc71zacpte4 q3)wthe same source. Each speaker produces a tone with a frequebcgpa7t3tc,tq1)z/nq/b 2)rewp4 c dncy 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 tz .te6-uld nc8wo 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 and a particular beat frevoif8c x-qg3uw k)a.3:t ga *bquency is heard. What happens to the beat frequency if the frequency of one.)gc o *8uwfb3v3gxk-q :tiaa 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 exccu,njyw,o 0 t x06xl+plains

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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. pk;8 uvd97gxsve-it) The frequency heard by the obsx7kv) su dev9 8-;gtpierver 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 frequency hear3 tgr*q;od(yow1( 40ayfrbiwd by the observe *tfyaboyd woq w0gr;r4i(1(3r 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 its0(+0 (ah gedvkdh:gq2,ctfza MACH-speed, its half-angle will decrease by a fakqcfazg 00, ed+d 2v:t((hghactor 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. What iscg d0:txv2b/ 1.mzjro the air vcg.1m 2x/zb: d0jtrotemperature?

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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 at 9d3z lvz nj/tyxa)1)q $0 \; ^{\circ}C$ 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 iqba,03bnicebs 1j*+ m/s, a bat emits a shriek whose echo reaches it 0.0250niqs3 ,bbjie *1bca+ 0 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. The temperature0-ab rphm ce3l8ix.4x 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 lightning, the distance trv.;b) qt)si xly0q:wo the lightning stri:0irb) .;q x)ylt svqwke 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 f if8n 8m5iqkb9rom a 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 splash 2.5 s later. How. secz .6q pa1c6-ttyc7 umf-z deep is the well? (Ignore air resistance, andf6 6m z. ccq.-17euzc-tytspa 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 wave of frert9j-)pthnss1i2 /f t quency 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 airn8pe6;ds6qlf9t9 xwe .ph *if 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 intenl m*4gmey 5*mlsity $10^{-3} \; W/m^{2}$?

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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 w yrm- * hz3q64ct6qspsound?

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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 f mhiq*o 5:7qyt8xib: d5eiy,intensities of two sounds with intensity levels of 70 dBif8 x7t yqm:i5 o,beq *hi:dy5 and 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 100 dB. What ;t4*ych xdxf hh;+/km is the intensity lev xhh4+hc;y*d;xf / mktel 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 radiati kv;pvzlt ;/b3ng equally in all dzt; v;3bp/vk lirections 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 mbe( jarmnk 9p / (9q3xur7xs)source that is radiating equally in all directioxp(x9rr3m j/m (k9 qa 7)ebsnuns 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-;1 m9xtvdrs7jff 8ds is assumed to be uniformly distributed in all directions. What is the intensity le-8;f djd79 x1fvsrt msvel 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 froocil(2n0tuj6y/)- y.b h mp1zz1 dio cm a barking dog. What would be the intensity l1mt6hz 2oizdiu 1(y cb- /opnj).0yc 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 ink n2 zr3 jduaxe9o:tow1d**7mtensity level is 60 dB. What is the intensity leve 9ndratojow:*uzkde 72m 1* 3xl (in 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 a point source is 95 dB. trt rlfa k1/:1 At what distance will it be 75 dBr:/1fttlr k1a ?

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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. s5 w7ntei6nc2i mj1;jqg rn/ 5 What is the freques2i n 5g5mj1r;tjn6/eniqw7 cncy of 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 harmonic of an open pi tr+e kq88/a3hulg1 ,v8yeqlfpe is 900 Hz. What is the length of the pipe?r uq,eyq8tfv+hl/ 3e8la g18k

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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 is 400 Hz. q 8wm605dslrwnw *mu77mf7gp What is the freque8 msm6fndmww* g0pwq 77l7ru5ncy 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 of soun9wyzdspfr0c 7 3l.5ppd in air is 340 m/s, what is the5 y3slfpw .r9ppzc 70d 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 temperatu r0ih o--1 ,bieeaaxk:re 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 frequen822rz1 ozo9*z bvd aze1 6occucy in a pipe closed at one end is 330 Hz. What is the freq2u* zceco6ovda2 bz1z8z91 rouency 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 diya,r;yjs00m1wzoq ,v0 0ko the shortest pipe closed on one end that will have a fundamental frequency of 60 H; s0o,,yk100vriq 0womzdj yaz on a day 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 in a room where theojhc/pc v. fgle81 r4+ q4fb7j 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 ;90 d*g+kak u6w/:;mxufpmt ec2sxfh* y3 eou 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 v o + l 2g.xn/hxuq627bry6eszwhen the speed of sound in air is 340 m/s. What is the fundamental frequru/x6bxv2+onyhs l e 6 gz27q.ency?

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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 j14aa 9xxiib2 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 isxxa2iai9b4 j 1 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 atx :3l h6hhwvl(cm1)where the velocity of sound is 340 m/s. How much farther back would source 1 have to be moved so an oh 6wh actxvl3hml)1:(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 byn5n xp5f+q v7r- bpn6y 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 detex57q-pvry 6b +5pnn fncts 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 Hxti y 3b4us zt7c0gm60z. 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 th cci3r9i s6-g :cvh1lc4;yv huning fork to tune the frequency of a musical instru 14ryl: 6ihc-hs9c;vccgi h v3ment. If 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 sounds produced by two horns are 6 m and 7 m respectiv2p/+oe ayi +3x 4wwaewely. What beat frequency is heww pa/+4 iye2wo x+ae3ard 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 visy4 ss q*sy-j4zrkb( ;olin strings on two violins in an orchestra are found to produce a beat freqs;s4j kqyr s(b*y-4sz uency 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 sourlqqv5qdl *i 7n+ fswk)e49ir 3ce at twice the speed of s 5dlqq4wr ieqs9lkf+i3vn *7)ound. The observer 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 (normalm adn+.m58ej*m; r)m:z djj)f +yoxr g frequency of 1000 Hz) approaches a stationary observer at one-half the speed o edx m+mmjg8a: j*m+.o ;fy j)rr)dnz5f sound. 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 listener moves with a9) i sbmkgl2+q speed of 30 m/s away from the source, what is the frequency heard by the observer? (The sound speed is 340 m/s.))9g l+2ismkb q

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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 tt ip:ib 6od:/hhe 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 o ib 6idht:p/: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 q2fk85xtw2 we52jqxp stationary observer when a train approaches with a speed of 30 m/s. The frequency of the train horn is 600 Hz and the speed eqwq 22ptx5wx 5jk28fof 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 6gm7 0lt( kvjiwhistle. Take the speed of sound to be 340 m/s. What freqm0vkl 7g6( itjuency 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 ilni;g8s.d w (cts 400-Hz whistle. Take the speed of sound to be 340 m/s. What frequency do you hear?. ;w s(lng8idc

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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 blows i/kpp*(zhohag;h u,2z ts 400-Hz whistle. Take the speed of sound to be 340 m/s.(2/*h ou;z zkghha pp, 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 at 120 km/h. Itwaan.egs/8)hv u7 rc4 blows its whistle, and you hear a tone of 400 Hz. Take the speed of sound to be 340 m/s. What is the actual freweh 8s/vnra.7cu) g4 aquency 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 3gadyghe38ku qp(o92 0k8qga 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 a8o9 d0gpkh (ag33uq28 gk aeyq 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 trai . ogrgbs,xyp2dc)i qj792w4l n horn is 500 Hz. Assume the speed of sound in air is 340 m/s. What is the frequency heard by anldg y crpi7gs)o .w2x9qb2 4,j 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 *qcg6. auocifku n4 w*.oh7x( object. A 40-kHz signal is sent out, and a 42-kHz signal is returned. Assume the speed of sound uk*guqoof.iwn 74h(acx *.6 c 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 byi5eki1;*cng x 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 isgc3d1v/ b v )i6+wtcpxn52xny the half-angle of the conical shock wave formed6 txpvgw+xbc3yd)2ni/cn 51v?

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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 Unbx e w uzfoc74ah65:0 thg6o,uited States to Europe with a Mach number of 1.05 where the air temper 6 u704efthzob :hu5owx6agc,ature is $5.0 \; ^{\circ}C$. What is the speed of the plane?

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