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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 statemdk; hsn3;kzausk50q )9kus.gent?

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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 condufh9y2 (b:qu vmf1.ltlcted 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 ofesx;9 d+y1w vp sound in 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 velocn 6om,0vrfzxqu ; si10tvw:o6 ity of sound? (Assume that all other factors remain constann0x, 6uqi;tw s1zv0:mof v 6rot.)

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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 4003g cjzr (ge4r-16s aeu-u(dkn Hz sound, the velocity of a 200 Hz sound through agg(ek 6zrju-esau -4nd 1(rc 3ir 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,e kao5be a/l1:jzjj/ g1:e +jt the wavelength of a 200 Hz sound in air it: +aa51ejjj1g lb/zeekjo/:s

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7#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Sound vibrations with freque:fm* c;)xmhg7wx +y ydncies greater 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 le)0bisi6t -s p:emgo5bss 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 uniformly in all directions. It1(b m7e;ox uybqx)h+f you move to a point twice as far away f )bquoy +xh (17mxt;ebrom 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, asfu0y 1c n)k5intensity 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 distancr2),n j3k s2fyrtyi6xe d from the source is I. What is the intensity at a distance 2d frk2 jt rr) 2,nyx6f3yisom 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 e :t va0mfyu 5cfh/e nez4jr4yb-1ra08t7gcj1qually in all directions. What happens to the intensity obr 7 f g5aun4-tye0fa1 mth ccv8r1y/ 0e4:jjzf 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 equau0;mcmxect3 x )*3irolly in all directions. What happens to the intensity levec*xo 3r)i0 uce3x;tm ml 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 increa7zmb) lms6g 2oses 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 a speaker emitting a pure tonq2.:nl 4es 1 jbfhd v+5a7rzlne. What characteristic of the sound14s : 2nnlb+.za d7hvr5qfjel increases?

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16#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What determines "lou 8p l/l(lfmm46q,mybudness" of 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 "pitch" of abp iq 5n97hlu2un r6.)o z/hne 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 watj 0i:*wexp oc f0t(+r 3*evxvher

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19#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Pressure and displacement wxmhy f ,haks3)z)unu1 xe(+)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 t*vmscm2nwww h(nx u a./ 7yy:,he sound wave generated by the gui yv/au ww(hx *s2c,nwm7mn .:ytar as a result of this vibration. 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 ope1 yffbg75 r; hvezo9 rgmi),;kn 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 lowestx6vy-3vtsj7 ,a h5qorn,,nk k 4 .xjct tones prqt xn yaktv3vhs,45r x.k-jco7n,6j,oduced 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 200 Hz. Which ke ,j hau479)mdrjb1h one of the following frequencies will not resonate in the same e7a4hh1jjud9r), bm kpipe?

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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 is(o1yl) yqfgog 2*,qxts fundamental frequency. Which statement is )ooql(1 ,*fxgg2sq y ycorrect?

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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,vaxrd+goz h7r: 9e6i7 w pbge9kn/t:/ 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 m16g- hj al3zzs5uu p,nf d.6gwavelengths of the three lowest tones produced by this pifl3, znagzh.-56 6us 1jgumdppe?

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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 xv+x9n5/f : fsq8fd qqv2 qdj)the following frequencies will not resonate in qx8d jfx:f q)/2vqqnv 59dfs+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 clol7r- k+ns3jkox, :ddg sed at one end is resonating at its fundamental frequency. Which s3o,ndrl- 7gjdxk+:k 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 the same t3v oqqcy4:air,c*+p 2z- vajsource. Each speaker produces a tone with a frequency of 200 Hz on a day when the speed of sound is 330 m/s. The personyq p av3qzcjc2:*av-,+ir t 4o 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 bcocv/q8 97p1t dmsc1s eats, 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 particular buhe sx5, 0v-hxeat frequency is heard. We5hs-,uxv x 0hhat happens 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 explain ns*k76r*c2d5eus k oxs

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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 statiz ywi.38e6lpjweat ah.:e q.6onary observer. The frequency heard by the obslaz we6eqjwh. 8.:e t.yia3p6 erver 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 lu9 +qse(/z4u5y2uxjm ube g:stationary observer. The frequency heard by the observer (qu:5m gl2xs/z +ueb4uej9 y uis

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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 s/)fd c3pcuc90ii 8qk4gk.wj-speed, its half-angle will decrease by a factojd3 94i0siuc qg8cc/.)wk kfpr 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 ultraso* 32t xy o1:shocht5ycw f)w(znic sound of frequency 45 kHz in air is 352 m/s. What is the air temperature?sx5 ( foc3hyctty )wwoh*12z:

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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 t4+ 9peu2ld*ar4v5 bx g swf3tahe 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 sounu3vqz6 9c(s,3hf 8jiw bigfm (d in air is 340 m/s, a bat emits a shriek whose echo re(bi(fwif9 vuh8gjqm3,3cz s6aches 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 hear the echo in m:di)6wf6f;,qk2 fhlz m ;lp w4.00 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 seeing a flash of lightning, thebtnep khu*8l*3( nakd e7 /s(h distance to the lightning strike is ( b hk/3ua*dhnset p7*( 8lnekabout

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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 tyyje +mvk) v*)he 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 dd9drjomy9:i, cx u47ixco:k; lc0 3hteep well and hear the splash 2.5 s later. How deep is the well? (Ignore air resistance, and as 4 d9m ;tichoijlxccod9yx:k 7r3:u0,sume 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 j8o *-,qt1.4 myx-ou gp lfxptof 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 aig c(pys ,utl:.(em tp5r 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 intensity czk / 3nlq1gi-$10^{-3} \; W/m^{2}$?

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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- 7cg8j ux(.yny9s g6updB 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 intensi.0i bl(64ese) y5duav krl ed(ty levels of 70 dB ie)asl yuk4 (b d.lvr50e de(6and 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 intensity.ta5mr oc .uc0 ra)l nu3d)q5*lv/lke level5t/vc. nl3)) ar re lcqmau5k*dou l0. generated 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 t2kz; kg7,pmrphat is radiating equally in ;,r p2gkk 7pzmall 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 6.0 m from a so7v9x25 jy lzpeurce that is radiating equally in all direlype 2 x59zv7jctions 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 assu vldi;i48 2k/5d wkktvmed to be uniformly distributed in all directions. vdvkitid k8245 k/l;w 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 a barking dog xs/zcs7qiz;a *yz/b8. What would be the intensity l /;sc8 sayz 7*ziq/zxbevel 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 level is 60 dB. Whati)t wli .m tw.t/6zd9l is the 9)t wi 6m.lid.tzw/ltintensity 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 sourc; gqcs kfe9q,h.el;u/e is 95 dB. At what distance will it be 75 dBeefgklu/. ,9 sh;cqq;?

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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 +**hbbi t* gcls2 ba6sis the frequency of the fourth hari*bblbh 26ss a* +tc*gmonic?

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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 j, ucam-ax m -y+n)z1kof an open pipe is 900 Hz. What is the length of the pipea c)ym+-j1xuzmna k, -?

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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 igl.a getdk)8mf btfpa.9j 5g *9k y6,cs 400 Hz. What is the frequency of the lowest tone that will resonate in an open 8jtg* ak9dbk5aptg e, .g)m l6cfy9f.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 0.8t 9 ked1:8qxsyssi3k+7xcm f,0 m. If the velocity of sound in air is 340 m/s, what is the frequency of the sec e k1i+s:s3q9y 7dsxcxk m8ft,ond 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 roovy3gzc+..iri . mzld 9m 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 close+;bae+gktlkrj h xf7 kq:g2/u ,t (cbkp,2y;ed at one end is 330 Hz. What is the frequency of the khf+u ee:gk tl( g,bx;q/2,p;+2bky r k7ctajthird 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 fk w+o+87a5nf8 gju9umtcr x6on one end that will have a fundamental56tkc+ nm8 urwaof+ fj89 ugx7 frequency of 60 Hz 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 aj cz as3qzq.+( room 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 tempe eg5x;6 je2zn exq8n;q 6xy0mbrature 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 w7-20re f: ij/usvpwhm h.-k yplayed when the speed of sound in air is 340 m/s. What iri-ewjwy fk0 v2hh- mps7/.u: s 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 ope5r-.xg g*zl4po-c jpln and the other is closed on one end. If the fundamental frequency of the open pipe is 300 Hz, what is the fundameng jcxg-oz. rlpl4 *p5-tal 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 frequev;+4+-k*ny xefum ex/vlmv -incy of 800 Hz in air where the velocity of sound is 340 m/s. How much farther back would sourc-e+vv v xn yk ife;/l-um*xm4+e 1 have to 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 siru xwd8--*p v tq3-.n ( qtu8krp-pjlkde by side and driven by the same frequency of 500 Hz. If the distance from a person to one speaker is 5.00 m dtuqr*-p q 8.kt 3j px ku--(-pv8rnlwand 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 4mm kq b7,zx+m t5;1px8i :iotqeny1 e140 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 550-i7mchp,q3u.)yi c:m wHz tuning fork to tune the frequency of a musical instrument. If the tuner hears a beat frequency of 2 Hz, what )qiypmc: .3 cwi7 mh,uis 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 svnv u) dtly0,we/7u ,iounds produced by two horns are 6 m and 7 m respectively. What beat frequency is heard when the horns are sounded on a day when the velocity of sl, ye t,dnwu/v)0i vu7ound 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 to proa5vrc-:7q-ycay* ot :ha c wwkqg)9l+duce a beat frequency of 2 Hz when a frequency of 660 Hz is played. What pehkrqqwa: l cyy) gcvo*7t 5-a: -cw9a+rcentage 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 stationary 1000-Hz sound source at twice the 3u) (6 gdfn,kex,m gxsrr1z-c speed of sound. The observer hearrx6-3 dggc,kxe, )r( 1f zmsnus 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 stat0:r0*cqz bj tyk2iu1eckn1m.ionary observer at one-half the se. c*1bzm1k0 n0uikjcty2 :rqpeed 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 listenern/jimr*hn/ -/ 5piy7 +hnn1g:l icja r moves with a speed of 30 m/s away from the source, what is the frequency heard b/l r hh/n5i7i1/m yr nj-ncn+g*pjai: y 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 st 13m1a m5)cr40luf wubqh 4usiren. It is traveling at 35 m/s on a day when the speed of sound through aibl 4ruh 11mumqu0a3st54 w )fcr 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 by a stationary observer when a train approaox5):g1 g f9pfwg dt+cches with a speed of 30 m/s. The frequency of the train horn is 600 Hz and the spe +t9 fg:f)gwdco1x g5ped 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 4rd6hb28lmpbe, 6tx 1 0sp.gct00-Hz whistle. Take the speed of sound to be 340 m/s. What fr, d8g x61h brslp2e0ptcbt.6mequency 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 )-4n rjsoo1cp2 jvx9strain blows its 400-Hz whistle. Take the speed of sou4pvsxs 2 r)o 91cn-jojnd 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 awa+ 1;t2x*; hiosq3xfe1 wmmjkmy from you at 120 km/h. The train blows its 400-Hz whistle. Take the speed of sound to be 340 m/s. What frequency do youeq1 jiwx;m;*2 o1ktf mh 3+smx 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.p 0 8b0t3hbrda It blows its whistle, and you hear a thp8d3t 0arb0bone of 400 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. Assume the speed of sound in air ishc2 gfv 8dm*9q 340 m/s. What is the frequency heard by an observer if the observer is moving away from qfv chdg 89m2*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 aimp0a ocf l06j*pka4i0r is 340 m/s. What is the frequency heard by an obs00p0kja l 4fmci*oa6p erver 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 o 2hvr8+p cz9tmvd/9ra bject. A 40-kHz signal is sent out, and a 42-kHz signal is returned. Ar 9a8 vd9 v2cp+mtrhz/ssume 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 q2 f4zdj(qt -ccrg i-: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 of Mach 1.4. What is the halad 4 qu:t y6e:70a7tcn/ukudw/r ;swzf-angle of the conical shock wa tsw//c;kutu67nu4r:a:dey d 0a wzq 7ve 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 th qj895zktz ldi; jc25ze United States to Europe with a Mach number of 1.05 wherz;zkjq5tl8 5 di2jz9ce the air temperature is $5.0 \; ^{\circ}C$. What is the speed of the plane?

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