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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 fif-9 e/ ebc/l(3k oskhdtm3m2.qck* is a false 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 fastest thrlu: :gg( 8ge7uu2cmqd3 frfn2ough

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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 gjf0,p6;+ 6e o8 arnbm(pfgjrz-; ybwin 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 tgzfno g;qth;04 7g:y- p z yl54+bixtihe air increases, what happens to the velocity of sound? (Assume that all other fac5b tpg n:7 tgzxhlgo; yq;f44i0z yi+-tors 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, th8j-5(xv)zk mzhb m1jf e velocity of a 200 Hz sound through air z)h8v k-mj5b( xz1 fjmis

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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 ofjj(5x; ykwk1 f a 400 Hz sound, the wavelength of a 200 Hz sound in air (k;j jyw5xf1k 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 Hzze-viz .6ipzzud/z (,ri 5u8:ifvt+y 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 2 /f-a7 ytn33t*ur uagg0 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 wavespic ;n ; h* x+l)4xn9ajyjcj5t fx7fw5 uniformly in all directions. If you move to a point twice as far aw xj;xn4;jp)*j95if5af c yc tl+xhw7nay from 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, intensity ismyn ztct5qbj z27+i/8 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 9xpt1 4v j l+97k lgafo92brjka distance d from the source is I. What is the intensity at a distancev49+71jpt lf2r9 g kbalxjok9 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 equalrbnyz oi4++7.3tnr f2x jfu+fly in all directionsn 7fy ufn4zi .+t32jof bx++rr. 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 that is radiating 78xmn dq1rz+jm 4n:wv equally in all directions. What happens to the intensity level of the sound? It dro:qn mwx 1j7m n84zvr+dps 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 l,vdkr z llnlm:c1.-q2ouder?

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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 svpvuy96z- ; 0oopr 6tk)-xg hhpeaker emitting a pure tone. What characteristic of the sound incoz0orpy 6hx9tv-pv-k ) 6;ughreases?

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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 -w l7g*t7ydx oolkz71n hmhxo2 /5u6 rmusical 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 "pittu +6bah yjrbb.)1(zlch" 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 watxp 44lu,c8p+( djw .jdbrc-nzer

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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 a(xokexo w0gb e6o66f .re

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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 2. 3)4 *ru(ormgglrwmgs 1eglgenerated by the guitar as a result of this vibration. What do these two waves se*.3ro1u g )gl g2lw(r4mmgrhave 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 wh hw7 l(; ndf9hbhw63/qgb0cji9 q,eymich 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 ya. bc9t1d+q.dv l dz-of length L. What are the wavelengths of the three lowest tones produced by this pipqddz.c vdb9a+yl .1 -te?

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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. Whiyix-nrqo8m x1.ys )5nch one of the following frequencies will not resonate iy n.my-8xs oxq1 i5rn)n 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 funley9 bfj42 r1bb 2lbaom+rfft*u1 . e3damental frequency. Which statement .u1bjr*4f 2b2 fl+f39r1o l ytmebabeis 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 at the other, th.tgh eukh +eua76z(8zere

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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 le9 wh ,mxd935n+nr rfsongth L. What are the wavelengths of the three lowest xnr9+fdmh 9,3r s5no wtones 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 length L is 200 Hz. 4q)qsvdz.xm efnh 9*1Which of the following h9*fznv.ex4) qsmd1q frequencies will not 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 en hlxj +5 vytj:/,:xbxcd is resonating at its fundamental frequency. Which statement is c/xx:b+jlh5xj: t yv,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 th+p ftcnpw:b9 4e same source. Each speaker produces a tone with a frequency of 200 Hz o+49 ptw:n pcbfn 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 w ba c9o1 c gtp)e zs h/8yp,0vfti2/dj9v7;pdtaves 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 togetherscztbm -cb7 )( and a particular beat frequency is heard. What happens to the beat frequency if the bcmtzs-7)b(c 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 explpm q7vc.:n)d vains

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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 heard by the ht 6qm/3ao-0:pyweub observer ih6p ut-beqa/ 3:0wyo ms

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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. 1/:svmxy o* wnThe frequency heard by the obser o/s:ywx 1mnv*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-spse7*w 7hldx r3rl1 eic4ts9 2feed, its half-angle will decrease by a factodhxwts* 1lf3e r 7lei r42cs79r 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 frequencyof5i a9dqc;;mv ,h2pg 45 kHz in air is 352 m/s. What iscv q2fp9 io,gadmh;;5 the 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 airxp:2 d0yhb t2g 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 e ,s0qh5qdwlj8;nqx o 0mits a shriek whose echo reaches it 0.0250 s later. How far away was th;ws j od qlnq,xh05q80e 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. e i+xxd6 sgt q /z7wt:wqt*a31The 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,c h,b 7ueqaa6) the distance to the lightning strike ibhu6 a)ea, q7cs 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 tempera 9(by(e s 6xed;z* 2f-bruogxjqhg t2j0dal// ture 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 9xyt,-xp. pm rdeep is t,p r.9txmpx -yhe well? (Ignore 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 )/umh o tub;o0wave 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 a h0jblmflj,l,qw t9ina/afxm/s 32+1ir 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 intensiyur. az z69eb/ty $10^{-3} \; W/m^{2}$?

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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 ol m u*k(rhx7* 9lv fm,.0mxthwf 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 i a(bqm6,br; pl */xt5 xyoqd:pntensities of two sounds with intensity levels of 70 dB and: q yxb,p6p/x( t5lb*adqorm; 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 is the intensit s2/lhk +izs66/qe6nh)tla(cg. dj t ry level generated by one engines(nrath 6 + zj )/d6chilg.lq/ 6k2set?

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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 disqjrhp/wk*q + 6tance of 6.0 m from a source that is radiating equally in all directqh/*k wrq 6+pjions 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 radia; gxp*ro h1c);cpup3yting equally in all directions isxg;3hp*pcy poru )c;1
$6.0 \times 10^{-10} \; W/m^{2}$. 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 uni;d(tl ii+8vef0 j kn g/mapr5-formly distributed in all directions. What is the intensity level at a distance 5.00 m fr lg-er/a(+d fi 8m5pvt0nik;jom 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 bar435df 1bzv*d8cdntj,fx k khv w5.k 2tking dog. What would be the intensity level if two identical dogs very close to each14v*kz2j. tkhfc dd,5nkv fb38x5dt w 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 tots cd2:;i2zjhe intensity level is 60 dB. What is the intensity level (in dBcztji o;: sd22) 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 pojr:; +3x(xwu dgtrpu5qq 4os;int source is 95 dB. At what distance will ituj+rr o:tp (xwsq 5d;u3g;q 4x 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 8i- u4wc*i ocy .0qphmis the frequency of o0*uichwcq.4- im y8 pthe 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 hg7s)g pu81ovb ( jvad:ys::nqarmonic of an open pipe is 900 Hz. What is the length of qsg b sv: apg78 u)j1:y:no(vdthe 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 izj x(40l nyktnt;88o 5fig :cqs 400 Hz. What is the frequency of the lowest tone that will resonate in an open pipe of length 2L?zocf j5gn084lky( qxti8;:tn

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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 so o wp3du(eduj;t0 +d(jund+j etu ;j3(odd(uw0pd in air 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 in a room where the temperatu xc q7wvr)n-;ure 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 7 ub.pt(hbj7ipipe closed at one end is 330 Hz. What is the fre(iu. bh p7tj7bquency 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 shorte55wor0mu m:nest pipe closed on one end that will have a fundamental frequency of 60 Hz on a day when the velocity of50m:mwon5 ue r 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 thjiu2al+ w*q4c(zcl (he 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 t+ +bb50ld:re+jvnid l dcw1q1jm0t h5emperature 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 speed of soundp1sevoct;t u(.bj7f6vf6*dn tp0ob+ in air is 340 m/s. What i(fo6 tve0 nbd7t.s;1*p pu +ftcjb vo6s 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 is open and th hj cjw-x*wz 0r5f4ii1-4lifre other is closed on one end. If the fundamental frequency of the open pipe is 300 Hz, what is the fundamental frequency of the cw4 jizlr w5ri h*c- i140x-jfflosed 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 pvbga*-0cgo )a 7x5anthe velocity of sound is 340 m/s. How much farther back would source 1 have to be m7-g n0 va*gox aba)5pcoved 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 frequency of )1urkdp 4v,ph3rz22ss 6 gwyp500 Hz. If the distance from a person to one speaker is 5.00 m and the person detects little ors )gs6u3,pkh y rpv422dzr1 pw 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. z yx32)ab+y wc 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 tune the frequency of a musical ie w5oqk( 6t7jenstrument. If the tuner hears a beat frequency of 2 Hz, what is the kqtw7 je5(e6 ofrequency 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 1 rtjtv*y:a6wm respectively. What beat frequency is heard when the ho6 1jvttr *:wayrns 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 voeuu;my.mkyo wvs9v 7p **-7niolins in an orchestra are found to produce a be;- wn*7o7yuv y. u opemvk9*msat 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 statirevp::*v+pr v onary 1000-Hz sound source at twice the speed of sound. The observer hears a frequenpvp:e vr*+:rvcy 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 f (k 5 vhgas8wi-w1g3cm71)rzmx2vsk arequency of 1000 Hz) approaches a stationary observer at one-half the speed of sound. The observer hears a frequency ofm1(xg) rswv785g3s -kwi2cza kv1a mh

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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 spee 4trv*pee/8if d of 30 m/s away from the source, what is the frequency he e4 *v8eip/rtfard 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 smh3f xl0, wm;5we6 dokiren. It is traveling at 35 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 standing along the roadside. What change of frequency doesm3wxkl5o f;ehmwd6 ,0 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 frequenc ok/- znidnuvu;713td(+i mi70ocmo w y heard by a 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 of sound is 3ui7 i1d-nmkzuc oo (imn7+wd 3;tv0o/40 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 400f5bh j qn5i2d3-Hz whistle. Take the speed of sound to be 340 m/s. What freq niqdb5 532fjhuency 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 trai5ap5z. 0g frtvn blows its 400-Hz whistle. Take the speed of sound to be 340 m/s. Wha5vpragf .zt05t 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 k)fmkqq9gm+azq 8c 4. k1jf z/zm/h. The train blows its 400-Hz whistle. Take the speed of sound to be qmac94 mgkz8k.)f q f+z/1zjq340 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 travelingjzfas.h e (;wf7(jqzzj; - v;m away 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 the actual f.;zv(;wmajzq(fj hjs z7e;-f requency 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*l df/pwq*;xwksw5z )nb y(xz5h+ j5urn is 500 Hz. Assume the speed of sound in air is 340 mfdljzq55n5k*/ s wx; xwpyuw*h ()zb+/s. What is the frequency 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 500 Hz. Assume the speed of soundyc,1jw.0 wl70xp3 oyv o 4kned in air is 340 m/,1 03ypwxwo o.c 7lnedyvjk 04s. 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 object. A 40- yzh/ 8d1oaoi6+aems ;kHz signal is sent out, and a 42-kHz signal +yoo hma86z; si1 /daeis 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 wave produced by a supersos8j(, t1zuxwx 8dlajj5tvw 56nic 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 Mfu7g;q e kxy6k; x)9kjach 1.4. What is the half-angle of the conical shock wave fo9j6 kq )7xxkyeu k;g;frmed?

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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 Euromd f6 msdqavtx4s-3(+5fr4ms pe with a Mach number of 1.05 where the air6dmrsd 53 +fs4s-xqvmm4a f(t temperature is $5.0 \; ^{\circ}C$. What is the speed of the plane?

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