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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 f20qg-gve c7st 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 conductefh*b v 3ffl mm/.vy2n)d 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 rot8xb6wuxm2 -mnpo7 4 md?

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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 th(t/.l4ku977ph5adpxb iu-zt -c,e x;tku gexe air increases, what happens to the velocity of sound? (Assume that all other factors remain constant.ik 4atx,e (uu5tk7-9xe xt h7 - lc;g/zdpbpu.)

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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 47qoc0n x2l4gh 00 Hz sound, the velocity of a 200 Hz sound througg4 nx7lco2q h0h 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 H;*4 yzbz1hput z sound, the wavelength of a 200 Hz sound in air iu b;1*p zzh4tys

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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,ad2/vswniag e ar e +,416mgsf)fms+ -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 5kx5 sq2wu/hs-3efpbocl5mmu+g5 (wthan 20 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 wave9 6+2eur2iaqveoazl 4rm ;mm7cve5n) s uniformly in all directions. If you move to a point twice as far away f m+auen 6cr 5zlqev92 me)imr;4av2o7rom 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 diverging waves, intenlj,3ty9)r2rsrs v pr c+ h9j5fq.arv9sity 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 distanc4tgyo:8x v4zp e d from the source is I. What is the intensity at a distance 2d from t pg:8v44ytxo zhe 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 qg eo724dl m/fqe w(o-in all directions. What happen(dwq-274/f e l qmgeoos 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 that is radik-cff6i oi8yh (fr07vcl 0 og6ating equally in all directions. What happens to the intensity level of the 8(flr hi67o v0yk -fg6 cc0iofsound? 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 x,5 uiagi2/g ,*bf rgesound 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 ton)b )bmm :e8osap56ei ae. What characteristic of the sound increaseseibap )m865s):mo eab?

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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-az, 19pkdya z/;z fkote?

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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 ms8pg) (*cco jtusical 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:x;3gh(ha 2( qjiqu ye water

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19#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Pressure and displaceme*(kios5igl o d9zc y2;nt 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 strinz)srem(vgno2ty3 ;b 3g and the sound wave generated by the guitar as a result of this vry( ng3) mv2; 3zbotesibration. 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 both ends, 10 w,otgb;ikrthere

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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 th i2q je 4ae)zl.qs3iu6ree lowest tones.e3 aq2ezsi 6q ujl4)i 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 length L is 20cmjei;ku484 .cv y 0hg0 Hz. Which one of the following frequencies will not resonjmv;0.cy kci 8ugeh 44ate 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 fundamentr/1iin0+ yokn al frequency. Which statement is correc0ionk+yn ri1/ t?

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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 ;bn xmln,1)fbk,j5wm; u*xruorcb.4 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 pipe84-nd .xdzg3 klo*jun4 m(bx(xgz)k z of length L. What are the wavelengths of the three lowesz)(nkg nkxg zo 3 -*(8xzx 4d.judblm4t tones produced 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 leng q * ,wf0zgla0:bo5aukth L is 200 Hz. Which of the following frequencies will not resonate in that pipew lg akufb 5oa*0:q,z0?

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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 fu3za qh9 uy13pi-c*,*x: xppik;wx dr-e nz xv9ndamental frequency. 9 h3icapxx* 3zxpw 1 p-nkyz-di:r;v,exu9* q Which statement 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 teu 8aj2jx)w7b s/ lsk/he same source. Each speaker produces a tojweskxlj ab u8s//)27ne with a frequency 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 waves s.)hgyz4eja t 8rby5fr(4 ik(x hould 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 togeth iwfnc6;*l0*c xbwlq3er and a particular beat frequency is heard. What happens to the beat frequency if the frequency of n 3 iq;*c*6bwwl 0xclfone 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 explld js/l2-/ /zt ssr4qcains

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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 frequr dj9;ty11krbyr 76suency heard by the obsrr t1; 9 6juy71ydbrskerver 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 station i,ed ht. h8yh h7+ef7ec9o.ythq7 aq7ary observer. The frequency heard by the observehhyc.7tiqy 7o +8he.q h79t7,h dafeer 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-ad.c *9hge wccjvc 0bo*9z5d6bngle will decrease by a fa9bjoczc6g9cw e h cd5**.0vdbctor 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 ultrasonicze5 5 5nqrqa8q:lovt1 sound of frequency 45 kHz in air is 352 m/s. What is thez5qqo5q ln r8v1e5a :t 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 the speed of sound in )d-bsw)g d suexe( ,i;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 3406gprzu6;9 nls m/s, a bat emits a shriek whose echo reaches it 0.0250 s later 9rsup6nz6;lg . 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 heaaw b.eia;br0.9 ua;r tr 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 s44 ;kujayiahb//e yc) after seeing a flash of lightning, the distance to the lighi/ h)jy/ekc4aba;4u ytning 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 szgiw*y/ wffrii et0v .,*g+m 2 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 a deep well and hear the splash 2.5 s later. Hgaj i vz3jt4kz7s,/jjj*2n74 7jn ppt ow deep is the well? (Ignore air resistance, a*jzp7g p j4z7j j, k tstj2i7/v3nn4ajnd 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 ff(u,d:tmx014rg 2isux *lxqq requency 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 35/aa /l.cn jjxc3hz0d5 2amym i4asz$23 \; ^{\circ}C$ 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 in3zgmv ybih1 k6a31gw*tensity $10^{-3} \; W/m^{2}$?

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47#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the intensitkihkx6( pzgodq 2s fzrw7 4v.o: -2mj-y 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 6x+xq/mw0bb,+l w mn zlevels of 70 d,mw mxnzl/+bq 60w bx+B 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. What3tx/g3gugqpo3+dq) 6,xhnsqfm + 2 n n is the intensity level ge,q qgp3hdxnx o33/s) t 6+g2ungmnf q+nerated 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 radiating eqab* *w bw vcs-gi.;oj)ually in allovga ) .cibw-swj; **b directions 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 twm6 6q5/rtq c6.0 m from a source that is radiating equally in qttc/ 6qmw6r5 all 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 aboutn+94k( uvvyg m 1 mW of power, which is assumed to be uniformly distributed in all directions. What (4 uy+nvg9vm kis 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 barki*n4 ztblz 7xy0ng dog. What would be the intensity le7y n0blzxtz*4 vel 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 fwcr h7xrlhkr66u, . (rrom a sound source the intensity level is 60 dB. What is the intensity level (in dB) at a point 2.0 m from the source? Assume that the source radiates equh6 7rl krcwh.6rru( x,ally 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 et+2ds1 0ocn +m/ xk 6ccltth*m from a point source is 95 dB. At what distance will it 0stmn*c1+ch/kteo 2+tl cd x6 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 cj-8mi me56eg complex tone has a frequency of 1200 Hz. What is the frequency of the5-ei gem86jmc 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 hex( :kizy , vxwl6s65 *wk.meharmonic of an open pipe is 900 Hz. What is the length of the pipv,ywli:hz .x6 kx6k* we sem(5e?

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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. Who kv7r)es:.ejat is the frequency of the lowest tone that will reso svj)e .ko7r:enate 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.85j e13bt,sotz0b4 fd/o djs g If the velocity of sound in air is 340 m/s, what is the frequency of the second hd8jt4 bbf0t5 se/o3od jz ,gs1armonic?

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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 whe8 ork ( nd,fm, b,hh9(yofyfq2re 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 iy ;gtsgmh0s66o 6 kse2s 330 Hz. What is the frequency of theo6 eyss66s0 h2m kg;gt 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 xs n9k b1 80,jmmex9dat 8kz6vthe shortest pipe closed on one end that will have a fundamental frequency of 60 Hz90,b mm1 6dknek x9vxtj sa8z8 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 rojrq 87d if04cyz5tmq(om 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 where the ta)la)p6*sa9 bdmb xr*emperature 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 when the s3z++pj vsfmu8i:yt . gpeed of sound in air is 340 m/s. What is the fundam3 +upjvzymf .tg 8si:+ental 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 is open and the other is closed on0lf8d;zzrl. cm)r01mfv 6motc 1q qk8y)adf4 one end. If the fundamental frequency of the open pipe is 300 Hz, what is the fundamental frequency of the ))mz8 kf z0dml0o vf.tr1168qay;4mlq cfdrcclosed 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 frequencyw1p c6qkq7 vl* of 800 Hz in air where the velocity of sound is 340 m/s. How much farther back would source 1 have to be moved so an observer 6c*wq71vk plqin 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 frequency of 503+w a1tsac-i l46ltt e0 Hz. If the distance from a person to one spea+64tactae1ls - t wi3lker 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 Hz. What is the beat frequency ae0vcn d,0f2.a+9gqlx. he/j nml1yy?

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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 tunin+ -9d4hb ozbwmg fork to tune the frequency of a musical instrumeo -dm9zw+4bbhnt. 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 -xen 02zg),lpjo6vkjrespectively. What beat frequency is heard when the ,vzln k-0ojjpx) 6eg2 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 two violins in an orchestra are found qwe7 ibto7 f0 09oulg8to produce a beat frequency of 2 Hz when a frequency of 660 Hz is played. What percentage change in the tension of one ltfiug8e7 007ooq bw9 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 approach / q4li)/ur5ei6j/l dqig(clkes a stationary 1000-Hz sound source at twice the speed of sound. The o//i6lujlqr( e qkd gil4i5/c )bserver 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 statc k12uw7gcs-mt2kv v2u.sz2lionary observer at one-half the speed2 tk22uucczvvl s-.1 m 7s2gwk 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 ah lm9xf*4 (xeld7c2k. 2js ncs speed of 30 m/s away from the source, what is the frequency heard by the observer? (The sound speed is j lc (4.ecx9f7ds*lxn2hms2k 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 t4yu-y6iz9*y cq2qf9wrtg -ipop, au fxxb *- *raveling at 35 m/s on a day when the speed of sound through air iifbu9- ta*, 9xqpcyo**26 4ypi--yz xwq u rfgs 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 stationary observer whavotrn2ni5:. en a train approaches with a speed of 30 m/s. The frequency of the train horn is 600 Hz and the speed ooi 5 :.r2natnvf 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 ncx,r -o-z z(zits 400-Hz whistle. rnxzz(z-c o,- Take the speed 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 st tlf3*h1i4 n: :pw x 9q1mhaenba tvgx:,hp5.vationary train. The train blows its 400-Hz whistle. Take the speed of sound to be 340 m/s. Whabq15e h:x t4npt a3a pw1iv,xgv f *.:hl:m9nht 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 kw.;-t i53 sbc)asnvmt2cf4 i am/h. The train blows its 400-Hz whistle. Take the speed of sound to be 340 m/ts sawfibvt3 c- ic.a)5m24n; 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. It blows its whis5u o,dec:yls26dp)xkh)zr; itle, and you hear a tone of 400c ,;d)ue p 2ko)56r dhyszx:il 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 horn is 500 Hz.yyr, 9hn; kv, otf1he3 Assume the speed of sound in air is 340 m/s. What is the frequency heard by an observ k3n o,;1fv thry9,hyeer 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 500 Hz. Assume the speed of sound in air is ;ed x.+eely4w x( ysxa9h +in7340 m/s. What is the frequency heard by an observer if the observer is approaching the train with a speed of 30.+9exhley+7x ( xwdn a ei4sy.;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 object. A 40-kHzh+ il 1g0 jr3glb7x:b+ynl-y d signal is sent out, and a 42-kHz signal+lb3r:h gigybn 1 jd0x+ 7-yll 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 conical shock we7p( 9o0sbdfl( zxo7towc (a0ave 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 spee d4s2lfax ac q,3)-cb (tepyr4d of Mach 1.4. What is the half-angle of the conical shock wave44f baxy cd)r,s ltq-p3 e2(ac 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 /dva) ooxjl/1 flies from the United States to Europe with a Mach number of 1.05 where t/) ldxavo/1 ojhe air temperature is $5.0 \; ^{\circ}C$. What is the speed of the plane?

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