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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 2(ou gc4 djs, ne,iz13vpwi-u 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 conducteimyd7.lvxxk pj9kq *e 9-o 3:ed 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 i;cs3.eapyh7i3-e ,gv2qxh icn 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 airw+p97mzjvj4etalhw;8w8 oiag+ r1q 9 increases, what happens to the velocity of sound? (Assume that all other factors remain c17 i l ajqz;ww48p 9+o+tewhj8gr vam9onstant.)

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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 velocitw+d3ztkzq:a6h(vzypf ,rg2e + q3 d- ny of a 200 Hz sound through air isp3g+zyq f :6(-wd q, tk2zn rahvz3d+e

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6#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Compared to the wavelengthbw e2rtgl1 l49 v)f(xxr 3*ainz;z d8co0h gb* of a 400 Hz sound, the wavelength of a 200 Hz sound in aog0 h(aldn iwrb39rx*2ce 8; 4zbt* vlgf1) zxir 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 g ziyx ;+ bwo7py9 ej8k5j5a3ffreater than 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 fl+h1(l7jmy(sb dywseo8jr j7 v c, -/than 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 waves u b6* hpw ;xodvu9f-a8jztrkt ) e(7m:7tnp1bvniformly in all directions. If you move to a point twice as far away from the source, the freqdhjtbex( a71 p zv67mur 8t 9w*)nfb:o;pv-ktuency 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 is proportional m wk(xldy39bjl 59 io:*su mj n(w8zk0to

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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 diw0j sipen(m 6v -s/8ygstance d from the source is I. What is the intensity at a distance 2d fromvwp0s6i m(ny -j/g8 es 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 in5fo 8pw:w(p fc all directions. What happens to the intensity of the sound? It reduces:w(wp5fpf8 co 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 radiath rlb,f)8c;s ur vm( ;ul6uge8ing equally in all directions.c 8vrfmle6hu8; rls, ;u ub()g What happens 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 becomes louderv 0c ; ,e+tyb qd.lh:jd1lday(?

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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 emittingu7t jmt( 9;f0 3bke sq+eoz.zy a pure tone. What characteristic of the sound increa3ytseqfo z 7m 9k;eu(zb+j.t0 ses?

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16#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What determines "loudness" ofn+n( v2mlq, fj a musical 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 gh6 6 j6 xq0pu b x3c2c58evgev*cd(jy"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 air into wat3yr/pg w* jinp-jk/c *er

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19#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Pressure and displacvj n rf8h -*7z9q7opyxement 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 ,ie f3uri t,8)u pao27yoee8lsound wave generated by the guitar as a result of this vibrl rf,23ep 8ioe8utyi ,e)a7uoation. 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, s*(w1; ynwtav 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 lowesg6 v;0 v1(pt6 clztfhojoo,q/t 60/ czghjvvqlto6o1of; p( t, tones 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 jwfoh ty0i, 8d/yc6l 2mk,8k+,kurwr length L is 200 Hz. Which one of the following frequencies will not resonate in the o,t6id hk j0r, 8,kw r8wmkf/luy y2c+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 rer bu /qf+1:s6rw(fhhc sonating at its fundamental frequency. Which stateqr h(1:u /bsr6w+fc fhment 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 clos5u.,rnxg6d-pi f) yydylh;4f ed 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 thes z9x/ r.:i4ha*forjr wavelengths of the three lowestjr*z4ahrir sf9 :./xo 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 length L is 200 Hz. p 3 2gtk soqnn2rx458pWhich of the following frequencies will not resonate in that ptn kpop2 s84g 3nr2x5qipe?

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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 fundamental frequency.m:i(z42xik re+ 3oapz pi m(z z2re :xaok34+i 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 2 qrur3 glq7m5by the same source. Each speaker produces a tone with a frequency of 200 Hz on a day when the speed of sound is 330 m/mqgrr ql723 5us. 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, /lfix htjvx 4ocw *n:g8 *jn0,the 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 particul vudn6 8ou5r55o;hfyb72hdk far beat frequency is heard. What happens to the beat frequency if the frequency of one of the tones is increasr5yfho;d6v nh8uu72kofd55 b ed?

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32#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The Doppler shift ex9w, z:lhlw+yaplains

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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 station*)vsy so7jdgr;qg6 ez23+gijary observer. The frequency heard by the observer is gs;goj62zj iydgv7e q*r)+3s

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34#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A sound source departsr xa)j( )t a,iju-ziz, from a stationary observer. The frequency heard by the obsrij,-ujtazz ,)(xia ) erver 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 /; ru,qji 7n2;t1;a wewpaqlyits MACH-speed, its half-angle will decrease by a fan lp; ;qwia,twq12aju7/e ;yrctor 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. Whath45gc zr 9ot6.b5vksp +i)xlw isx6 .ps5k b)9rw + ig4v5ozchtl 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:z(f mg0b/ba b 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/siv4x y9)f/gsz , a bat emits a shriek whose echo reaches it 0.0250 s later. How far away was the object that reflected back the sou vi9fxgzy s4)/nd?

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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 temperaw+l-hoc a-zs7ture 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 lightno 4- m0 xx05decemu 1oaand+)ying, the distance to the lightning scya)mnx0 1 ad eu+xo 0e5m4-dotrike 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 5w)uoyq r ,i0ttemperature 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 wefj a s92dn 06 3p3)huzmyjnsr4 qq05jmll and hear the splash 2.5 s later. How deep is the well? (Ignore air resistance, and assume the velocity of3m ap qns0z9qj h4)s 5nu63r02mdfyjj 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 f3w(lubyx *ixm.w5i:v 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 a-dxma4d r5fhs;3 k/rw ir 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 withd s2f4q+l twfiq,uy x 4/l5;pl 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 ;pm3n(sng7 j hrk/ ds*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 souzjj1mwll5 *4 zkqam /)nds with intensity levels of 70 d/mjljzak 1 w)*q mz5l4B 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. :-ncywb.0+h q dyx,bd What is the intensity level generated by one engd:+yd0,b.bw qxc nh-yine?

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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 diebl acc5 4z60rw/fjb 7stance of 6.0 m from a source that is radiating equally in all directions re6lac j45bcbw7zf0 /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 dista:i6mwg-/.s d hu gmu0once of 6.0 m from a source that is radiating equally in all directions isg m/.idum6w gu: -h0so
$6.0 \times 10^{-10} \; W/m^{2}$. 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, w c1bhnu3 l/aa1l l:q( yiu,)bwhich is assumed to be uniformly distributed in all directions. What is the intensinyal, wl:(q3)hu c1 bl1iu/ba ty 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 dBnu5 t*a cbcm1) at a distance 5.00 m from a barking dog. What would be the intensity level if two identical dogs very close to each other are b 5uacm* 1bn)ctarking?

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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 inlqb 3)3tio87 mkfn/lgtensity level is 60 dB. What is the i/ f8kl ) l33obtq7inmgntensity level (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 point s8q,v e9ep d:vu/qe v:xource is 95 dB. At what distance will it b,/: 8vxe qdqeuv 9:epve 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 complex1x3 q flqqd(l4w0z1er tone has a frequency of 1200 Hz. What is the frequency of rflq4 (3dq 0zxq 1l1ewthe 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 H:kcthx*wvcs 9qpvhu( 0 /sa09z. What is the length9(vswxacuc 9sph :v0t0 k*q/h 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 resona0c 94j.gi plhte qc-1fte in an open pipe of length L is 400 Hz. What is the frequency of the lowest tone that will resonate in an open pipe -jtp celf.i chg14q09of 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 bothx 8v05)7hk6hhmxoz ny ends has a length of 0.80 m. If the velocity of sound in air is 340 m/s, )vhh mk0hzx onx57 86ywhat 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 room2no6jla1b t.ry3)g+vos) a xy 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 oneeuak24+;d-y-h c tws 1 (pncscz.j+ov end is 330 Hz. What is the freq 4cjcoe+--vu sadpty nw+( ;cs2h zk1.uency 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 shoen oi+q b++8i/ikac7poi9f4 irtest pipe closed on one end that will have a fundamental frequency of 60 Hz c+f+ ai4 /k 9i e+bqoinio7p8ion 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 wfy:ln j m96es5r)a n/fhere 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 temperatup/t 2nmg;p)l)f,m eo nre 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 ic(f jd 2 tg3l(3kpz:ejs played when the speed of sound in air is 340 m/s. W k ec(z(ftj:2dg3j3l phat 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 j3u6gz lh:z,ouy* m0 ky3:f ansame length: one is open and the other is closed on one end. If the fundz3hy f3y,:k06o jgn:luzma *uamental frequency of the open pipe is 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 freque7 d5;z dzov0: +dkdcmew (r6fancy of 800 Hz in air where the velocity of sound is 340 m/s. How much farther back would source 1 have todd md0d:wrz5oekcz67(af; v + be moved 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 drivea54frx+ltqoomz : 0l: n by the same frequency of 500 Hz. If the distance from a person to one speaker is 5.00 m and the person detects little or no so::o0z+xqo 4lmlf a5 rtund, 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 ofzt, b+ 7o3gg:ddegc xo-;yho: 440 Hz 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 p 4 f11v7xdblo550-Hz tuning fork to tune the frequency of a musical instrument. If the tuner hears a beat frequency d1vx fo blp147of 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 producrunb-0rab8hi p 3 6u//vhlmc:ed by two horns are 6 m and 7 m respectively. What beat frequervh 0 68b:lb/3mau/nrcup - ihncy 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 two vild8 xuuu57o v3 h5kluz oflt5w0y5 /r-olins 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 tensior53o- l0u5 d7v8ht 5yu5uuokllw fzx/n 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 kw:rg- sda,hu*y,c;gbjv. q5 a stationary 1000-Hz sound source at twice the speed of sound.:d 5krqw,gu;vj- ,ghaby*sc . The observer 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 oc z8(dqo d+r1 /65 otxdnm) ojngzp,1rbserver at one-half the speed of sound. The observer hears a frp gc d18oxm z)o1dn+5 rj6( tq/on,drzequency 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. Izjui5 u3n66gjywuman 0:u 4am3 0ipt l5(4tojf a listener moves with a speed of 30 m/s awym(4i wt : pu6um6o0tl iaj53j3ajug0u5z4nn ay 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 siren. It is traveling at 35 l3xmni8ifcn.x ae5 ;.zu2-wy m/s on a day when the speed of sound through air im8e.ni l.x uyc35faz-i 2nwx;s 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 when a train approach6xg0.m j jh0 b:he 9cvd 8l,zk;qv6eexes with a speed of 30 m/s. The frequency of the train horn is 600 Hz and the speed of sound is 340 m/s.z9:g.xjqeh;xv, bhj 0v68ml kde6c0 e

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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-lz 4-q1a0 on;xwtc ci9Hz whistle. Take the speed of sound to be 340 m/s0;-w1nzq cai9loc x4t . 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 r*x:y wd moeh)qvs;.4 km/h toward a stationary train. The train blows its 400-Hz whistle. Take the speed of sound to be 340 m/s. What frequencew .qohx y*)m v4rd:s;y 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. eed+p94agj2yv* j l1rjfb-)eThe train blows its 400-Hz whistle. Take the speve42jgye a+)*f d91-e jl jrpbed 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 )y:tz 54bhxpxm7 nb t7km/h. It blows its whistle, and you hear a tone of 400 Hz. Take the speed of sound to be 340 m/s. Wht7)745xb zyth:bp xmnat 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 traihe68q;)kh p bfphuk9/n horn is 500 Hz. Assume the speed of sound in air is 340 m/s. What is the frequency heard by an observer if the observer is moving awepuphh/b9fk8h 6k q) ;ay 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,41x-gmbyb .)(;g s0cv(p lbsa exdg n. 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 a speedg blg d(mx)-0n( bc,xg sb.1ay;evps4 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 objh-u5s9t3jf up : xwce4ect. A 40-kHz signal is sent out, and a 42-kHz signal is returned. Assume the speed of sound is 345 m/s5-x hw3jf s ec:u4tu9p. 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 b4z g 6b h,dg(fotp)p9my 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 ik.ymzi)w++whalf-angle of the conical shock wav+.)+wkimz i wye 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 from the United State8mrursjtlb+f/: zb2 ;fe3 )pes to Europe with a Mach number of 1l) t/s b3rp2:z+feu m;fj be8r.05 where the air temperature is $5.0 \; ^{\circ}C$. What is the speed of the plane?

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