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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: 游客未登录  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 sta lxa7p(vfo c )a(*ous-tement?

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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 fastestp;1.lucw cu*v 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 rod60qyl/l9iw z3jzepj (ar 4m o+?

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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 z169x8egy jr wejqh5l96mo8d to the velocity of sound? (Assume that all other factors remaiwh1 8m8eljoje g5x6qz9d y96rn 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 o6w-yc8p 7b5+4iywq xvj0s/ xc9u ollsound, the velocity of a 200 Hz sound through air isbyo8qci 4 w ox5vcp l90/6y-lsux j+7w

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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 4f v5 a3)/jdg;sgyvnm50tvcq/00 Hz sound, the wavelength of a 200 Hz sound in air iss ydmq/;) fgtv v50cj5v3an /g

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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 20,00 ou ,scg:aky./0 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 H h4 aj,rtk2z5sju8+ a) 6 x;u5apvxu wz21xropz 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 waves uniformly2ev.ndw6(3 g g6 smvzy in all directions. If you move to a point twice as far away from the source, the frequency of mwvyz 2 .6( ne6sgvdg3the 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, intens ,:v8q 7zoawrcity 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 distance d from the source is I b8c((3w6esplbh84sr z;b(ed-hohlts d i+m) . What is the intensity at-be8ipw;( 648msd(h3)dset b+ollh scr b(hz a distance 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 s7nf/6i1eu7 gf cboz( from a sound source that is radiating equally in all directions. What happens to the intensity of the sound? ui17e6gz sb/n 7(ffc o 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 souwmun f,(r+kt.nd source that is radiating equally in all directions. What happens to the intensity level of the sound? It dropsn(uk.m +r w,tf 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 y q//j0 0mnk,pc p/deyas 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 speamp0,+ ru *w9ylnel b2eker emitting a pure tone. What characteristic of the sound increasem 2r9, +yew0pbllune*s?

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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 notw9us)e +wi89 ybf3n7h hrtqy6 e?

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17#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What determines the "b ;ee ,bdx9zmj(jo( j -gx6dk;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 from aa 8 fa0o9wlq)k6t)dya ir 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 displacemen/jv2p;jv2 2bhj(8nfcndd-c w t 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 w;h cg . bue1)hhp5fek.ave generated by the guitar as a result of this vibration. What do these two wavesh1peuck)feg b;.5 .hh 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 g6as bb:j qsta)r)fp;-77q ec 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 cu1a kft8o :y)of length L. What are the wavelengths of the three lowest tones k cuat)1 fo:y8produced 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( pz-,abu)wuz7;ak fl length L is 200 Hz. Which one of the following frequencies will not resonate ulp-a wa()zfub zk; ,7in 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 fundamental frequency. myxn9 a0n99s.sp5 m /7a:d/yyte yuhs Which statement ys9 9hdsny./0nt myu emx9:5s/pay 7a 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 ix68.ika zya-ss open 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 pipe of length L. What are the wavelengthpc3u*uxp +y p4c3 7dqrs of the three lowest tones produced by thi4ccx3u3*yrqp 7up+ dp s 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. W :59j 7 4jp)z z81u pl8qq7hzvpmdhjyrhich of the following frequencies wzrz4hzpq8hv97 7p mjdj :p)yul 518j qill 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 end is t1u3(xl9 np(-8j *wbis lzgdm resonating at its fundamental frequency. Which statement is cxg ni8tlu(9 1 *3(b p-dmzsjlworrect?

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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 sourcfu, ,hyc)tn; c1s*ae we. Each speaker produces a tone with a frequn);fw1ea h,*ccs,uy t ency 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 o5b8n.b d/ukb 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 particular beat frequ: 6 fy7h3qknv8cbaq p*ency is heard. What h86yf *3qnhpac:bv kq 7appens to the beat 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 explt. t6,(swgmb4pb iy d,ains

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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. The3 d3pgyap*t +b frequency heard by the observer3pp *d3a+bgty 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 stationarjqrkzev zd,45j,2ex 2;rs 4 pey observer. The frequency heard by the observe, evzdqjs ;x4e52j 2rkre,z4p r 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-angle will dec0 uo mpz h(:5/,dtglbwrease by a factor ofozm ,thdp(l5 w:bug/0 :

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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. Wh1izf ,pjcmw 78..q x )h r+vt3vrzgfv,at is the air temperaturv ,c v tqrfw8. 1gp,zhrmfvzi+ .7xj)3e?

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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 sptq :le0b 35+xtfc2 qtseed 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 wh+h:,t9cb n0 t*cgjvk uose echo reaches it 0.0250 s later. How far away was the object that reflected back the sound?,j*0hv 9u cb:t+knc tg

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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 iw86byx6 z4aih s $0 \; ^{\circ}C$. 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 l1 j .xy qt-/(2nspnqckightning, the distance to the ligq pjnxc/s-t 1 .2k(qnyhtning 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 th sg0t* .n3eyuf: gm9mje 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 wellhskr30ey 4d n8;.e qoo and hear the splash 2.5 s later. How deep is the well? (Ignore air r3e8 nsoy0 rhk.ed;o4qesistance, 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,:;. oey, ud ilvy(llf a sound 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 air atf1 4jy otjo )jro2sgqr2fv-01 $23 \; ^{\circ}C$ 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 sound71/ gml ft i-xpcpn(wjq8 x00 c4lw/to 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 s ebze)tt0q ang2l:2(c ;45wws 69fzn yde3vmdound?

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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 intensiyf;4 (ph 6fet7j0x pme.1bys dty levels of 70 dB and 4hmppd1t0f y;b6 74sj(ef.xe y0 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 j pgw(x4sgq44 bnk 1l j,/dgo2./ vhswdB. What is the intensity level gene4p/4,s2 /vnsw whog kj ggbj1lx(d4q.rated 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 ncn0j/z k9 9ikradiating equally in all directiockj0izn 9k9n /ns 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 dis1ro er3-:vnk (qz7lwke+(ki9 byewr8tance of 6.0 m from a source that is radiating equally in awv+r(q:eb- knr1 ye3zikr e97k 8l(owll 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 aa6m2gm:t3(ako m +y vebout 1 mW of power, which is assumed to be uniformly distributed in all directions. yvkm6om+g ame ta:32(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 a7 bf80h+pw(e3nr bjlu barking dog. What would be tj0n8rw+pbf7 ( lb u3hehe 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 lev38y3 rdsww( d6h;sd zvel is 60 dB. What is the intensity level (in dB) at a point 2.0 m from the source? Assume that the source radiates equally in all diresd6wy8 zs3d;(dw vh3r ctions.

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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 dB. At z2+kvxiv m m.(what distance willmk(vv +x.i2zm 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 mzfxmfq +pl5oz/ /i 1;wpme(0lp t04 jtone has a frequency of 1200 Hz. What is the frequency of the fourth hap1lx fi/0p p5otm+e4mf(/;qj z w0zl mrmonic?

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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 wip//i* d ;3q vvlpm0ethird harmonic of an open pipe is 900 Hz. What is the lengp pi/l/miv*vew;0 3 qdth of the 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. Wh(h kx :ykype) rrm9)7vat is the frequency of the lowest tone that will resonate (9v) ):rrk mh yy7expkin 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. If the vely sp ( w4b,0ql4xe p2dng54bosocity of sound in air is 340 m/s, 2ew d q,xs syn544b4lppb go(0what 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 a;02cyhm 6 ii0m4w4epkgq8 eqin 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 one end is 330 Hz. What is the ; wio r)oigo28frequency of giw 8o;o)o ri2the 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 o99o mp) jxv8bet qk+,vpn5q 3will have a fundamental frequency of 60 Hz on a day when the velocity of sound is 340 mqje9vx b m9otnp3 )vk5q8,o+p/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 temperature iwj9vo cp;kzfao0 /p- +s $20 \; ^{\circ}C$. 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 temperhtu1zl p1.z/ wature 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 tjfw*y qe2 eh-1 :/bu8tmui5bche speed of sound in air is 340 m/s. ej-u ethiu y58 cbm:/1*qw2bfWhat 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 samxp5tlu/28a gp dcj1m(e length: one is open and the other is closed on one end. If the fundamental frequency of the open pipe 8dcal / pu 1pmx(5gjt2is 300 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 q 0v zxauaa:w3zxkyeo 9g3rhb,5;,a2 velocity of sound 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 soun 39w ovuzqera,byzg;: haa 52,ak03xxd?

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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 frdqb5nybsp t7w0*-8.bva vx+ k equency of 500 Hz. If the distance from a perso57+ bp 8s- y.nvkxa* bqdtbvw0n 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 Hz7zhy-n3b q/kgsmu7. n8u*tdq 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 tuning fork to tune the frequency of a musicalpa.; z,m j8 y4 zf:bdhbf/x*ti instrument. If the tuner hears a beat frequency of 2 Hz, whi:m t 4z,f.j8;/ pbhabyx*zfdat 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 a- yssc.95 zuupf5jpic2),d vare 6 m and 7 m respectively. What beat frequency is heard when the horns are sounded on a day when ti.y5u)s,pdpjafvc s c9zu-25he 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 vo6geoncs,m* z ftcbc..dw,1;iolins 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 bring the.,o*nmtw c;1ebfscczgo6, .dm 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 thyll. cq984ce ie speed of sound. The observer hears a frequency of ll8yc4qc9 .ie

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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 o m nl wgu 41nrisi(jar*us:26 :vo.si5f 1000 Hz) approaches a stationary observer at one-g4i16rsrs5v m u(. i won*ia2snuj::lhalf the 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 listene 7p7fqi3 0ctw8,du4ztm tu- zer moves with a speed of 30 m/s away from th i78e7fzwt3 p-4cut,d qt m0uze 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. It is traveling at 35 m/s on a day when t1+jh8 c:g0ca 2zfn+tj5 t g:man.jsc vhe 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 does the observ t 0:+c:ccv8t .m+ j gsga5fnj2zjn1aher 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 frequenc0evcv5sbilyz( 5 t1k ;y heard by a stationary observer when a train approaches with a speed of 30 m/s. ;vbv 5cse 1ikt(l5y0 z 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 120 km/h. The train blows its 400-Hz whiscoz8+taw q .v.tle. Take the speed of sound to be 340 m/s. What frequency do you hear.a8ctq vz.w o+?

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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 towardk:/ sdc k5o)pf a stationary train. The train blows its 400-Hz whistle. Take the speed of sound to be 340 m/s. W)p kkfc5 :osd/hat 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 knnp-p f(tt-0x(g t o1you at 120 km/h. The train blows its 400-Hz whistle. Take the speed of sound to be 340 m/s. What frequency do you hear?k--gnt(p tt np0x (1fo

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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 120rg)z,r a6iga 6h1h(ss km/h. It blows its whistle, and you hear a tone of 400 Hz. Takea6rhgsrs(,) 6i1az gh 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. Ass-r2ffa 7 *qqey(j( cnxume the 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 train with a n *(cx(aqfr-e 2jq7yfspeed 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 spee6:ags qv5yyfqmj:8 2 cd of sound in air is 340 m/s. What is the frequency heard by an observa5:q 6q m jcysv:yg2f8er 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-kHz signal isam4(w i4xs u(y sent out, and a 42-kHz signal is returned. Assume the speed of sound is 345 m/s. How fast is4u(syw4 mxi a( 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 supersonic aircraft 9rzee5 khj)w5c+to ,j cxu81jis $60^{\circ}$. 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 the conical suscjx lc24bt5 y032hj4 eeac,hock wave form0 2cbl5jhsty4ce3 jex uc,a24ed?

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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 Stat 4)cm wrf6z)pgo2wjm2es to Europe with a Mach number of )rj2p)gm2 c z6wom4wf 1.05 where the air temperature is $5.0 \; ^{\circ}C$. What is the speed of the plane?

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