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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 stzw: bf3h*vm/ latement?

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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 throu ;mrlb7 u q:qxo;dd9/ngh

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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 i4/dvnm+cea a 7n 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 of /fk t(+ocb(rrzi4 i3 csound? (Assume that all other factors remain coniczf( kt(ro+3c4 i b/rstant.)

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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 sound thro+uj 06cx*sswnughs6j+*cswu x0n air 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 400 Hz sound, thwev s6.jb, mw*b;s (i+*sl znue wavelength of a 200 Hz sound in air ilb.6sbsnu,z*w( wj;* +se vims

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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 than4g l8fr n9,p s 6u4cn5j/jirmtc;ndy) 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 aretc-)-f( wdupp 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 directi5k;qkr g;y h/rons. If you move to a point twice as far away from the source, the frequency of the srk y;rk;h gq/5ound 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, intensit8nf g 29lc(mkuy 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 b p ;t:zap1ew.0-rd:px,0 jxzqbd as+source at a distance d from the source is I. What is the intensity at a d-p,z.0b x 1d0jp;atr be +sdaxp :wz:qistance 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 distg uv u.dss.)+xance from a sound source that is radiating equally in all directions.)ugss+duvx.. 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 from2v 7kko;rrt5t4 *a i7,z+ - cptozutsf a sound source that is radiating equally in all directions. What happens to the intensia+t sf i-rc;2t,z t7t*v45oz7rpku koty 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 followi7))uy u1c xjfk,xw t.xng 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 a8 ;z:1tay8dxmy (ww5nye23a3dls cmr speaker emitting a pure tone. What characteristic of the sound incre1 d8setl3 n;aymz82: d5cyx rywaw3m(ases?

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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 nc2s,,lq:yqf 9hv2 dxk ote?

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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 mus(lxw0gs 36nz oical 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 int3bwr 7- ucg8hro water

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19#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Pressure and displacementou)-n hb)d p 4zkxa(3z 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 q )pdm+evp+h( kd15inbarw4h gw9 *x )sound wave generated by the guitar as a result of this vibration. What do these +)x bv (n*qp1)hphwi+5 rewma 4d g9kdtwo 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 qvv+9wk w.i8e 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 length L. What are the wavelengths of the three lowestb/dpuxn w4oa615y9u e tones produced by /owbp4u1a5dx yu 6 9nethis 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 200 Hz. W+)*k7v3 8dwzoe- jzwcbp3h;xcn + gouhich one of thc-ogvwn hw*xj dbez oz+3p c7 83k+;u)e following 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 resonawzq5(hy(g/y7ao6s) 0f zkybating at its fundamental frequency. Which stateyb k qgyafyoazh65/s(wz0 ( )7ment 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 closed pgcyhro (w( (a v*ny6.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. Wh )aspdxqsb3:c .k-j( vat are the wavelengths of the three lowest tones produced by th asxsp3dbj)(kq-c v:.is 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 of tho6syye40:rc ;3gnlrrb (v*xpe following frequencies will not resonate in that r s( gp403*bcyyve:;rxrln 6opipe?

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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 funypq;eq q1m1hun* eo/(lis+d(damental frequency. Which statement oeq/m i(;sue l+1 qqhd (*n1pyis 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 speake 4cutwquz -b0.3y-a thr produces a tone with a frequency of 200 Hz on a day when the speed of sound is 330 wt.3 ubchut a-0yq-4z 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 waves shouldevt u;,(* xczx 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 frequency is heard.472 vbcui ck+g What happens to the be4k72ic+ cbgvu at 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 ex:cfy+mu8 m7 ffplains

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33#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A sound source approachos gzf7p1gr*6 0.aoa xes a stationary observer. The frequency heard by the observe o* 7xafzg6o .ra1gps0r 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 theftrzuj ibpp6 4x-bt/.2f) /obh7ud a3 observer r2-dbp/f)bb6jtpa hxfui/73 t4oz.u 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-ang ee-)n8+z:hum iy) vhyle will decrease by a factor of:h+8veezi-mnh y:))y u

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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. szp/)6hz k+qo What is hk/pq+s)zo 6 zthe air temperature?

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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 thf h,y s ,7 utk rasuu/x p2566qpkfx0gdb91qv/e 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, dxmt8 w0h80 *v;f8riy a x51jbwocd;kh3 u/axa bat emits a shriek whose ecr1cmy0;x;tkd*oibaawx8w8xd 0h u3 5vjfh /8ho reaches 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 heu4.w )iaiuf -s4s kpmjd1b ,(car 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 se0m3un / v.p1xotvpaz -eing a flash of lightning, the distance to the lightning st3n /xavzp m-p.10uovtrike 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 ti.z+:bnw b oc2emperature 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 wel ( 0 guq;2 xz4oap ;(x+u3qu-hzp8 kqbfnpm8hgl and hear the splash 2.5 s later. How deep is the well? (Ignore air resistance, a u(8p8k(2 n0 bqxp+uzhq g3fgzhxum;o 4q;a- pnd 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 wav(fzo 9hh6km)ze 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 ywz p;/rzyiam k5 al 1do9/*o+$23 \; ^{\circ}C$ 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 sount *jgc8:crpu+,o wl.5itpvg/ 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 intensitysut-3 i1.ybgh of a 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 intensity levels of 70 db 8e(ax 5(xb svy4hbz*B and 4xsh4e(bz*v(5 y x 8bab0 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 e r.r: xsv8zrompy di1:6/m1l+wru im+ngines in a garage is 100 dB. What is the intensity level mx/1+ irmm8 l rvpuo +r :zd:iw61r.ysgenerated 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 radiatus1 8bo7l6x8wirk ew3 ing equally in all wk137xu8e6w ibls 8ordirections 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 nh3k4(pb.y,f3kv d-nh lfsv 5m from a source that is radiating equally in all directionv yfhk,bs35d-3 p( h.f4lvk nns 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 uniformloo( gnd6u 8j*ry distributed in all directions. What is the intensity level at a distance 5.00 m from u8 rndjo(*6gothe 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. What7ch(desf o-/ii k9*sc2dj,t v would be the intensity level if two identical dogs very close to each other are b9ovid hk,d-fs7t2i* scc e/(jarking?

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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 intensicx q48jjc3z +aty level is 60 dB. What is the intensity level (in dB) at a point 2.0 m from the source? Assume that the souaqj8+c43 czjx rce 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 t0 c r5z;8ko 1j 5maz6)pklsnzdB. At what distance will0 1kct5zn ;5rzzm)j6pkosa8 l 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 tonene/jco s(xo / 9a0 t;/rildzp1 has a frequency of 1200 Hz. What is the frequnoic tslo dej/a0;1 zp/x/9(rency 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 pipe is 900 Hz. What is the lel+z vo 54lg+k6s5b mnzngth of th+ lzg+55kb4s zn6 ovmle 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 400k*t4 ucd4. v nj j0dpq0+wc4fj Hz. What is the frequency of the lowest tone that will resonate in an open pipedutd+4 j0 vccj 40*fnjqp.4wk 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 ha3*1n ijdn-agd-m.(zwrq o d0b;f wj 2as a length of 0.80 m. If the velocity of sound in air wa2nmjzf03r;db(n1-.w i*gadj o - dq is 340 m/s, 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 i0u-(r de6zdh bwcf6s 3n a room 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 one3m+ma stzd)kcp1o:,9jt g,e v end is 330 Hz. What is the frequency of th eg:,cv3joz)p k+s1atm,md t9e 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 end that will have id 2k+nq. s6l/d 3n4zusk) b *sfckdx8a fundamental frequency of 60 Hz on a day when the velocity ofb.2nfk*k6 sn sd)lz8 iqdk+ sd 3/xuc4 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 whp:j 0l)gur cv54l os6 2 4occdzvy88ocere 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 where the tr07dp ppkr(sot/o3 d+ xq*zk3emperature 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 ofceqm1, k8+ j-*xvmiyz length 0.75 m is played when the speed of sound in air is 340 1i m8ezkxy *jc,qv+ -mm/s. What 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: one sr27v u od+maspf 7 :usho,u,(is open and the other is closed on one end. If the fundamental frequency of the open pipe is 30s dp,uss7 ro h(f2u:7u+ oamv,0 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 veloci(6 ctg)qgo81yxwd n33+xfu em ty of sound is 340 m/s. How much farther back would source 1 have to be moved so an observer 8w d1o6c qu3g(gmtyxxn f) e3+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 plal i*d ay-*ry:8x* tkrdced side by side and driven by the same frequency of 500 Hz. If th**dyrd i*ya8-l: krtxe 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 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 9haq+*y )kk 9ng8 nhylHz. 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 tur: m trotk0tc,,*sn- ane the frequency of a musical instrument. If thsntmo,ac - r,k:0r*tte 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 ot*dl,g- jg ,cproduced by two horns are 6 m and 7 m respectively. What beat frequdgl,cj ,go *t-ency is heard 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 violin strings on twt he;x fdp;v*7o violins in an orchestra are found to produce 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 bringp*d thvefx7 ;; 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 the sp u op:z.s/p:bteed of sound. The ob.p opubz:s /t:server 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) appxca / h d(2*ltsqx;y:oroaches a stationary observer at one-half the speed of soun:o/l( ;*ysda thxc2 xqd. 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 yb;j/ w,e3 yczy -y*8xo ijl,wHz. If a listener moves with a speed of 30 m/s ji,yyy/x , y3w8elowjb;-*z caway from the 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 c*j72kjvef*kmq5eg 9 siren. It is traveling at 35 m/s on a day when the speed of sound th7vg*kkjmqc j e2*5f9erough 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 n)5imor44wg /tpnv5dlm - ys1by a stationary observer when a train approaches with a stp5 yl/miv rdgo 4wsn 54m)1n-peed of 30 m/s. 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 12zuv u,ax ,bi100 km/h. The train blows its 400-Hz whistle. Take the speed of souxi,b,1uvz u0and 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 blows -l z6r (:2co;ujy0zh(ryxlbdits 400-Hz whistle. Take the speed of sob6orzdl u zr(cx-h(y2l :; yj0und 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;5* xd ntl7pun blows its 400-Hz whistle. Take the speed of sound to be 340 lt x*; 75nndpum/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 awayq(bc6s;m0 aj) niy+xm 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. What is tha;0 6()smx ym jn+biqce 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 Hzbj214 f* uekm1 hgnrd/. Assume the speed of sound in air is 340 m/s. What is the fd kh*g2rm1u1bj4enf/ requency heard by an observer if 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 5y+b1 wrn*xy)ym50hx 4m on*rh00 Hz. Assume the speed of sound in air is 340 m/s. What is the frequency heard by an observer if the observer is approaching the train with axy0nyr wny4r*x*hb5om+1h ) m 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 rj 6): 80ih trriuci0pspeed of an object. A 40-kHz signal is sent out, and a 42-kHz signal is returned. Assume the spe:r rph j uc)068itiri0ed 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 co,1w dx sund:0inical 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 n /kb-na c+:ovof Mach 1.4. What is the half-angle of the conical shock wave fornakv/-o:cnb + med?

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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 Uni*octk4v)a. ) y; mjgqsted States to Europe with a Mach number of 1.05 where tmjk;4*tog vc)q.) ys ahe air temperature is $5.0 \; ^{\circ}C$. What is the speed of the plane?

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