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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 statf;c g;yu)kx;gh4fnf f *l 9dd.ement?

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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 fastest tf hkev(*y0 gu7hrough

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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 rodq2:8 ewv2uovd ?

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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 ha()d-tmiitj 2a ppens to the velocity of sound? (Assume that all other factor at-t(im) jdi2s 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 velocity of a 200 Hz so ph,nvg7lwcn63z+dte46 dr w/hl 9s)jh 8 p8omund through air 4ezrw 6h,glmsj 6p/ +h38v opnw7ch98ndltd )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 wavelength of a 40 ).dhiby4s3iev d-, pj0 Hz sound, the wavelength of a 200 Hz sound in airv,dy s i3dhbj. ie)p-4 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 i7 bvrbo 4pbk+7, :jv1omya,l 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 calle*ry0j w.lv;;jk we -ojd

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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 dirj1z-* eso;jcvc m:r0o 1z:rlp ections. If you move to a point twice as far away from the source, the frequency of the sound will b c;z:jm 0r-v:o js1zrco*p1e le

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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 proportiot58rmf ;jckj 3nal 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 soupvj/ f 4o0vmk8rce at a distance d from the source is I. What is the intensity at a distance /pvjm 48fvok 02d 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 is7fo38bozr 9 ek radiating equally in all directions. e9 o or3f8bkz7 What happens to 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 source t+g9fij 3ec)j dhat is radiating equally in all directions. What happens to the intensity leve j)+idgcf 39ejl 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 followinsn/vhj. ko9.ug increases as a 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 pure tone. What characteristic o+d0edat5 -lg8v ;8wx4cu0 vns,psrt vf the sound i8tru,0v5s8+gvac;x 4e0 pt-dd slv wnncreases?

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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 *hi*.nr x 4ehbmusical 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 "lq z533ug 7dh :deocgz *yx0h-pitch" of a musical 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 frowk+em7r14 d/pe -mmc bm air 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 displace0sc;y):bfenrnm t +t(ment waves 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 w0e w 4cd-v68lnrd:n snave on a guitar string and the sound wave generated by the gcn4se:lrv6wd0 n-dn8 uitar as 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) flpga0,:xk*x 8ngdz is open 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 lengthqyv7 n q.r5;kxm;nfy7 L. What are the wavelengths of the three lowest tones produ5rq y; f7mkq.xn; vn7yced 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 le+a a9bqy guvu3hrm162ngth L is 200 Hz. Which one of the following frequencies wig m q3ah+ybura691u2 vll 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 fkrq: i 0 -mdighrpng d34(lu4rx9 z8e1undamental frequency. Which statement iiknqg1h:4uezgx4dpirl r98- rm(0 3ds 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 closed at9ka ax5+ s+n 71bgiutb 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 thfkx ubp(yud8:3.pnkl;zhu . 9e wavelengths of the three lowest tones produced by this pipebd; 83x(z plu kunp.:f.ykhu 9?

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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. Whiton- r gts-i; h*t-v hp:fh8t;ch of the following frequencies will not resonate in that rt if8 --nvh;t p:hog*stht-;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 nc wi.83ig nco0)vp y* x4bra4ix.ku)fundamental frequency. Which statemengn o *0ib ia.4vxwc)xkp 8n3yc4uir).t 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. Each speakegfwe s /896 /755hzfvpojswgsr produces a tone with a frequency of 200 Hz on a day when the6 jgsvw8f5/fo zesgh 9wp75/s 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 k;ta ajf0f-eb g3g( q2sound 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 parhn+i, 8.z hbwoticular beat frequency is heard. What happens to the beat frequency if the frequency of one z+n,.hwi8oh bof 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 explaiezq p5 mtl b/a+ ryh;2v6af3u9ns

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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 ho c qwznl0zt26)hqf;7 eard by the obset2)7wcnh 6z;q foz l0qrver 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 observ w;ksvbnd(.k.ctt9-ier. The frequency heard by the obserwv.ikbk tsdn;.t c9( -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 MACH-speed, m-+g4n dljfimhcl6q4 ;8 i. rmits half-angle will decrease by a facm-mmjh +rnqc6 .f44i i g8d;lltor 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 fre,fr.hb u w+b0pquency 45 kHz in air is 352 m/s. What is the air temperature.0brwhb+u, pf ?

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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 syj;3jdz -g oc 4izt32bound 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 :d-cs1; tmk+ro0qtdj oapt91 shriek whose echo reaches it 0.0250 s later. How far awaysdot+ 1d0 tm ;-ptj: cqoak1r9 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 temperature is x/uu+(xbnyh-db/ 2ot*f zly( h3cxm; $0 \; ^{\circ}C$. 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 flas pg lv/fs9.go +po2:eqk1, hich of lightning, the distance to the lightning strike is abvf :p,ho e ./pok2gq19lgs+c iout

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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 2.0fb ev/3kln6mbrf6 :rc o1:q-s s from 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 p;smmq/ g s0t7a deep well and hear the splash 2.5 s later. How deep is the well? (Ignore air res q7m0;m/ps gtsistance, 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 a* pzi./od q28ib,jjo 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 ah vopc,9kk) yl ,,(pynir 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 intensit+82sxmeuc48 n,wrnv:ed d6x b y $10^{-3} \; W/m^{2}$?

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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 : :fkesw9y -jxav0w.yg8j 6yla 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 intensities of two sounds with inten den8reia :e:i-dcfrgw6 zi j/,*y3)b sity levels of 70 dB and 40 wdz:gri -f/eaj: neii,b6r)cy8 e*3 d 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 dBbc 68 fewra*wc9 v4e4w. What is the intensity level generated b6v4brwe*wac9e4c f 8wy 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 ev 7/bcrgkt-, dq l)h9radiating equally in all directions igt )be-9rk7cdhlv/q, s
$6.0 \times 10^{-10} \; W/m^{2}$. 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 thdo :tn.:mhl;o: pf9saat is radiating equally in 9dp:t ;:m onl:fha.osall 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,ahdj,wcv*zc1 vab 435 which is assumed to be uniformly distributed in all directions. Whatcw4 *3z vvj 15abad,ch 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 dist0j ot /5)ps.(rv1mhp3nm 9 luh1liltd ance 5.00 m from a barking dog. What would be the int0n /11p hjml pou5tvd9.()it3ml rhls ensity 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 intensity level is 60 dfig7yjn7 . xr5uf *0,ets*hky B. What is the intensity level (in dB) at a point 2.0 m from the source? Assume tha0 ryk.5g7 uxt*nje,7hff*syit 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 :m3* a kx(lurspoint source is 95 dB. At what distance w*sxum:r( lk a3ill it be 75 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 of 1200 Hz. What is the fyh+lcf4osf ep) 4+2 ,zcqxos/reqx+2 slzfhoycp + ) /qoef4,s4cuency 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 pc,hz *nk:e9t hipe is 900 Hz. What is the length of the,te k9nzc:hh* 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 length L is 400 Hz. What is the4fteblfotwlm -sl a5wj6 ;8 :: frequency of the lowest tone that will resonate in t mb4sall:-w:f8e;w to56fl jan 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 h gj: *c(/ac:obyhmsk;z*, u b5w3hinqas a length of 0.80 m. If the velocity of sound in air is 340 m/s, *yqw ;b gkc3/c a,s u5mbohn(jzh:i:*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 temperature +r3 xt)5kr,e4ezvog ot x4jn+ 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 i//wd8llpn zz5 n a pipe closed at one end is 330 Hz. What is the frequezz5ldn8/ wpl /ncy 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 shortest pipe closed on one ende,plsegw ai-unh,61 993mesy 2wy/za that will have a fundamental frequency of 60 Hz on a day when the vew3 e9p -i1y gasz96 lna2s/my,uhwe,elocity 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 e;+fu5jx6xszcu8 po.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 ;u(nir iz 0np7k;2io gin 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 9 rr/.1/3 lzkc,r/sgvwd fxn lwhen the speed of sound in air is 340 m/s. What is ,x rd3g9/ .l kr 1wvl//snfcrzthe 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 leuy qcv8ljb azg5p;47m-vh -k* ngth: 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 fundamentaac7zmuhvl-8y5g bp v-j;*k4q l 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 emi q* r+zs,mn :otz42vwzt a frequency of 800 Hz in air where the velocity of sound ,z2+ m:4tnwrqov*s zz is 340 m/s. How much farther back would source 1 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 side by side and driven by the same fre3;gr6) q d9qgptjxli+ quency of 500 Hz. If the distance from a person to one speaker is 5.00 m and t;j rq6lx)gi qp9+gt 3dhe 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 frequen. 3ldv1p uyu;00lpa dccies 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 550-Hz tuningm h4xmd8;x*vr awgk :: fork to tune the frequency of a musical instrument. If the tuner hears8; 4h* drkagwv:xm :mx 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 sou 2o+y kixgi;d 21.eyota3n9w fnds 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 velocity of sound is3.o 2di9xgte n+yf;2ak1yow i 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 n;w23yw4 6 tzl0zuowjstrings on two violins in an orchestra are found to produce a beat frequency of 2 Hz when a frequency of 660 Hz is playe2l3twzuow; j nw64z0yd. 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 source at twice thd3 (b5/pd 2lxs g4egxae speed of sound. The observer heaplged/x s a4bx (253gdrs 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) appro vp (u.mr/e2caaches a stationary observer at one-half the2u/v .(mc erap speed of 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 a -q-i /jmgk q c3fbf hd 2snf4e*+cl.*lspeed of 30 m/s away from th l s3 df q-2.mffj/ce-ncghlib*q4*k+e 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. Is2lxbtd6q8 4rx8dsz( t is traveling at 35 m/s on a day when the speed obxs sl8(qdx6 d r428tzf 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 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 stationa l4k( )5g5a ynajcmpe4ry observer when a train approaches with a speed of 30 m/s. ng54 m4 laa( ej)pck5y 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 towarxx1w,+d9 a6 )obl)zhlpgidi8d you at 120 km/h. The train blows its 400-Hz whistle. Take the speed of sound t+9hxb )plx ,6g) 8ldzda1owii o 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 tra t4un thb9z(5tin. The train blows its 400-Hz whistle. Take the spzt 4u bt9h5(tneed 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 train blows its 400-Hz whis:en9mylc fp,;1coj ; jtle. Take the speed of sound to be 340 m/s. Whaomj,c;1cn f9y; p:le jt 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 1)ir/ bmvp6j; /bnqbh;20 km/h. It blows its whistle, and you hear a tone bmjbbr)v/;pin 6 qh;/of 400 Hz. Take 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 ho 8.x2:;zjdj7zxs:s)z7zh r.owgqfq p y5 t/amrn is 500 Hz. Assume the speed of sound in air is 340 m/s. What is the frequency heard by an observer if j 7;zzyo2s.zw:x8p jm5f):gxq/hsq .7tzrad 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 horn is cvzb2+ufy)w1 500 Hz. Assume the speed of sound in air is 340 m/vw2) c +zufy1bs. What is the frequency heard 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 objectu9lv.fd, 3t : tsal1ank3bm+s. A 40-kHz signal is sent out, and a 42-kHz sil,u9fab3+v ts l.admk:s1 3tn gnal is 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 coni h 1.sdvxctxx 2/ep*u;cal shock wave 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 1b :j x(e0b:dapa 3n xtvb0rj5*ga5mr,.4. What is the half-angle of the conical shock 00rba j(dvb3:b :jgat e5rmax xpn5*,wave formed?

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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 numbe s4g4t 6r-vrbjr of j4-tv6br g 4rs1.05 where the air temperature is $5.0 \; ^{\circ}C$. What is the speed of the plane?

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