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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 falsemvg) ;c,mzk9a ifznx7u ;,6ze 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 fast i9/paev.jnb,bp kys s40ql30est 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+ ra yhri1hlw7m0* v2lgv2- fw?

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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 vez:sal0gxly5lb .:u* 1 oa)uf j o2far8locity of sound? (Assume that all other factors remain constantg.rualo)f b81o xs0:l 2y:ajuzf* l5a.)

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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, tht22x /rh+u9 6kdrffro e velocity of a 200 Hz sound through air 2dr trf 9+/kx6hr2ofuis

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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 wa,go,d7ys+m ecvelength of a 200 Hz sound in a yc7s ,g,moe+dir 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 20,0007jgj8ej7cdwe -) b7q n 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 etl249d1hczx)gp)t a20 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 souk/b f)xf p.m5mh+ az-vrce is emitting waves uniformly in all directions. If you move to a point twice as far away from the source, the frm.bf k 5m-p+vz/ha )fxequency 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, inubtbfn*u*x,sd z cb s+8 3mo a+2lc9 y11zewz1tensity 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 so) a0vyr0*j dms8k;sf lurce at a distance d from the source is I. What is the intensity at a d ask 8fs)l*jyv0 rm0d;istance 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 radiating equally in all diremu1qe k ;penqj7j/,bww+1q/ /w/lf rections. What happens to the intensity o 1/wqurf jple+ /,q/;wwqmne kjbe17/f 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 ;fov4c 5v.c ojsource that is radiating equally in all directions. What happo5;jv. o4vf ccens 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 bep,o fa8i0 bkf83s3zcocomes 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 chaso);zz;c 0,wn v kq6jzracteristic of the sound increases?zs ;,6ovj );qkcw 0znz

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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 n (x5dq/5q96shwjo kzeote?

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17#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What determines the "pi3n apy+- izd3ktch" 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 from air into 37xepuald .3f water

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19#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Pressure and displacementhoe/kh8d w)q;9o2 dm1*iky.+)pz e6gm owy m c 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 wave on a guitar string and the sound wave generatedb2e ,/zb2 vxxdo )y5p uh4-bje by the guitar as a result of this vibration. What do these two waves have in commhxz-/b 2jebb ,5v2 yuxd)4epoon?

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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 both ends3it ,tq xu0q7 tc8jht(, 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 of the three l 9j1fhtexsgj,b -y;q *owest tones produfx* 9jhtyqs-g;,je b 1ced 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 length L is 2 )xfen4+1 a3jeykeyu2 00 Hz. Which one of the follo3)1yx+yee j2enukfa 4 wing 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 hv:yuc t4gt 4:at its fundamental frequency. Which statement is correcyt v4u4t: :hgct?

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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 y5m *itwl6(p5nuq h d*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 pip) /a)bx .sh55 wgifpvpe of length L. What are the wavelengths of the three lowest tones producp si5) h/5.wgf xav)bped 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 2qhg8(me-v bgfj26c z length L is 200 Hz. Which of the following frequencies will nqfc 8h(bz2 vemg -j62got 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 nz. saw2tzc7r 54s3yqxgf 9p *vg,t:h is resonating at its fundamental frequency. Which statement is co*zcyt9haw :3s.sg2z,r g n4p5xf7qtvrrect?

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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 tvcgv-3p dz e-4wo speakers driven by the same source. Each speaker produces a tone with a frequency of 200 Hz on a day when th3ed-c4- gzv vpe 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, thv hr q2 3fjq67-uyyp0ye 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 together and a particularz z9 ;o-l8ljmi beat frequency is heard. What happens to the beat frequency if the frequency of one of8-;iz9mjlo z l 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 explainjznpv,1,pq r(3 wf1u*5s9ort blk8 urs

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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 stationamdb zgum6x*.t1/7w mwy59aj w ry observer. The frequency heard by the obserwydx65 bam1g*w .t9wumzj7m /ver 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 heard by the deuf(,*f 8/ to-cytgii 1br c8obetc- fyfg8idobrc 8ut*,1i/ (server 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-anglusx(f 4y1* ckpe will decrease by a fafuyk1 x*(cp4 sctor 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. /-6h,rf * sd kbsmv1edizp4x)What is the air temperature?*v6s,dxp1b fimde-s4 zk)hr/

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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 tqhg/hqav 9yz92bza 41 he speed 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 shriek whjc..:kjc9b7 rk e q-r7zzmsm b .3)cccose echo reaches it 0.0250 s later. How far away was the obj7mrs) krc zbj 3c9c.zbj-.cc km: eq7.ect 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 4xawq; n .d.j-n.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 seeing a flash of lightning, ffxvx5ybx 3q 7(-m.3 tudjq3llh)q0o the distance to the j-d x3vo0l3)f5b q7 .xqqtluh(f3xm ylightning 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 day the temv+za9i pqh0vn 9a/ cclj r)z0f g*wt.5perature 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.k: )swwawb2h* How deep is the well? ( hbwww:*)a2ksIgnore 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 sound wave of freaf ismnc* j -t;))p6rbquency 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 atb(z a /1mb wfc(l8p4fs $23 \; ^{\circ}C$ 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 sounl1.h,i hhq05gv -y0dkknpyf 5:ys xo/d 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 70-dB soxa0lagie(ssll5:0 z. und?

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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 twpysn(+)k.v j 2;peq ofo sounds with intensity levels of 70 dB and 40 dB?;osy2j. q(evk n) +ppf

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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 dqd)8zo6k2nh:ow1 g zin a garage is 100 dB. What is the intensity level gzq 8:o1h2ndodzgk)6w enerated 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 distx58l. (3ctenpvjse e/ ance of 6.0 m from a source that is radiating equally in all direcvces(ee j 83p/xl.5nt tions 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 is y*,o7celr7d uradiating equally in ac7de yl,7ro *ull 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 pow4q .pm:ov aim1er, which is assumed to be uniformly distributed in allm qpai o:1.m4v directions. 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 distance 5.00 m from a barking dou70s*y h ra00cai u1iral +p,kg. What would be i7k00*+la au,r0ihrau s p 1ycthe 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 the intensity level is 6exb ixp+nel q(-z,p3 -0 dB. What is the intensity le- penibqe3 pz+xl, x-(vel (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 p7x-g 1-ujmyi.ko l 6bfr(cdf2oint source is 95 dB. At what distance will it be 75 dB?-ikc16 og 2j.( lb7ydf ru-fxm

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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. Wh.c6kuk9-llai+ ve3afat is the frequency of the fourth harma9+f cku 6ai.el3k l-vonic?

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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 or71migz ze a+1pen pipe is 900 Hz. What is the length of the zer+g imza17 1pipe?

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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 qe:8q (ly4jucbpar7:j2gz6jmn a )5vopen pipe of length L is 400 Hz. What is the frequency of the lowest tone that will r(mj2pjaa cg5l :yqz4 6q:ej7nbu) 8r vesonate 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 99sgq9 sfk ,2ush;urn length of 0.80 m. If the velocity of sound in air is 340 m/s, what is the frequency of the second harmf9,u n;9sks2q u9hgsronic?

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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 roomp71ac bm knq(u m8tpb;0/kq/j 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 frequency in a pipe closed at one end is 330 Hz. What s6bj* x;y/c4 pmq u(tnis the frequency o4tmcq (;uj *bn6xpy/sf 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 g-e/,rz8 *s5 e0ieuk;dm qjusend that will have a fundame -8rz q; /eseui5dkug j0s*em,ntal frequency of 60 Hz 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 the temperat ,. rh841 +ojuqzbjungure 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 where the temperaturenhz(l eg /w8/f, l/mzv 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 -;/ mv(yuguk.e*t t(xb jn k1jof length 0.75 m is played when the speed of sound in air is 340 m/s. What is the fundamental f .k vnu/ gjjmx(be(y -*utt1;krequency?

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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 :/1r)flj 1yg lur ;4mk 6wtyvibbkr3, 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 frequency of1/;rb4yirwl lk 1 )vmfuy6,gbk 3: jrt 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 8y6u tt31)ut*xca18v:bq ub5 a iq lgvin air where the velocity of sound is 340 m/s. How much farther back would source 1 have to be moved so an observer in front of t1y qbt uvub3g:8atc8)6qau*1 v5il txhe 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 sam-hxwuu h(c/*ne 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 possible the distance from the perso h-xuu /nhw(*cn 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 Hz:l ihawle2df: g3r; 7b. 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 mq-atr ((x5zztuning fork to tune the frequency of a musical instrument. If the tuner hears a beat frequency of 2 Hz, what is th5z- zxtaq( (mre 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 respe ecsqud/r.xx4,m zg7 +ctively. What beat frequency is heard when the horns are sounde e4+xu,qc. 7z/xdg msrd 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 violin strings on two violins in an sbr6q3a;b )mq2:k xagorchestra are found to produce:asa;2xg b3q)mk q rb6 a beat 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- gb/fa 1: 0o.bp1l/cfi.awxugHz sound source at twice the speed of sound. The observep w . 0://giaf1fbb1.xaulcogr 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 stationary ob;o+kfzhw/k) hst v 47+ai8eew server at one-half the speed of sound. The obsereh7khi8soe w;a+ 4/z vkwt+)fver 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 xxa(trs/ t v6 n* vwrgy;3wu* v.b4 *8r(ypdmxspeed of 30 m/s away from the source, what is the frequenc/y.d (rtw*(g86s3v wr xx4* pnrv;bay*m utvxy 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 traveling at 35f7 ,pxwez7; nz 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 standingzpe 7,7zxnw;f 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 stationary obtz swxo4+xl75server when a train approaches with a speed of 30 m/s. The frequency of the train horn is 600 Hz and the speed of sound is xw t5o7lx+z4s340 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.:d fhl1 qo9 -pj eax4.nbn-z/y The train blows its 400-Hz whistle. Take the speed of sound to be 340 m/s. What fre 9foznj1.-4 :p dlb/hxayeqn-quency 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 blor./ ,mo 5ydmbmws its 400-Hz whistle. Take the speed of sound to beb. 5m,y/rd mmo 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-Hzb pg313 ifke7cs(td1r whistle. Take the speete 1s f(rp c17gbi3d3kd 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 at 120 km/h.rvx c;-kc/,cmbzqt19 7hbi4s4v*rmjvoe+r . It blows its whistle, and you hear a tone of 400 Hz. Take the speed of sound to be 340 m/s1 k7-xc4 9m cstbj4qrbzrv+cvir* oh/., vem;. 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 t,sfzu jq *w1 34ehbsdhc1 .cj0he 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 trai1cdqf31 h4s ujh,sce0*. bzjw n 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. Assume the sp h.jo5kot:/k seed of sound in air is 340 m/s. What is the frequency heard by an observer if the observer is approaching the train with a speed of 30.0 m/ok t:/ k5h.sjos?

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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 object. A 40-kHz signal is sent oup 3oau-uol/t-qfr p(2 t, and a 42-kHz signal is rp/(o 3uqtfl -ura p-o2eturned. 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 con;5 ed htikis cbfp:(:4ical 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 1.4. What is the half-angle of c*wx ,a1* ;/ p jqnubwnx5a(rian 1e6jthe conical shock wa ;a n e(n/i*nj*raau jxqw15px,6c1wbve 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/748 dwqo60jbhu cim c:gh1 if from the United States to Europe with a Mach number of 1.05 where the air tempe8do c:gc/ 0huib mw67fi4 q1jhrature is $5.0 \; ^{\circ}C$. What is the speed of the plane?

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