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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 followi/rwumxg r,tn )9 *y/ipng 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 throu+*qcyg7u qt 1ogh

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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 stezzoxrdu;utf-z7- .3je mz) v(el 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 isv; qr yvn-wappduf98+-o y 41ncreases, what happens to the velocity of sound? (Assume tp9 woy-q;dvyas+4u p-v1r8fnhat all other factors 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, the velocity 9ycnsew 5 j; +w4bjrw6of a 200 Hz sound through air ;+6c jr jn9 wwws5eby4is

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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 aan) sc4(4 llra 400 Hz sound, the wavelength of a 200 Hz sound in air rlasnl) a c(44is

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7#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Sound vibrations with37n.k / p soxfi ln8,ec0ez3kh frequencies 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 less than 20 Hz are* :1z:jhmbmp ep5oah5 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 sol931/c5iv(nujv d 7z fgazc1turce is emitting waves uniformly in all directions. If you movlzvcf7di v/1zutgna 1c935 j(e to a point twice as far away 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 is proportional p:wahj o4a b )wwshei *jh5wo/n,79p-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. What isqlz-e,( a**zsb : e9e4 uylys3 6cgkqq the intensity at a distance geqls *l3c*:u9bq e zkeyz 4q (y6-as,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 nd9hxuh 5l0 .j) kqfrncm/n:+source that is radiating equally in all directions. What happens ) 5.0lh:q/nfuhrn k+cmdjnx9to 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 soun 7d f-nsmvs5+ud source that is radiating equally in all directions. What happens to tusnd +sf-m75vhe 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 ,.qg2miafkwu2 .yu 8u*wwk 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 tone. What characteristic bc 6n2dmjinyo (jn -9zte- 6i.of the sou inn6i6-oc yb 2z9md-j.(jentnd increases?

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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 musicalhks28lm6b ir7 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 a musi;u: c4yfkx sk-m uuqs.*es+ u2cal 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 ab6y/+;hr1sn rhh-nw1 v 6emiat d.,t air 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 displacement wa 7bodz88mp0 1w1+se u1k pgizg-elza;ves 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 guvi8*dkj 7 vv y,0flynx 5:i.bwitar string and the sound wave generated by the guit.: wy7vyn,vbv8 *ljid0 xi 5kfar 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 open at both e:o fe3//szaeokc3/i g nds, 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 wt:i*ofn*b 23lkyigi* dz y*8favelengths of the three lowest 8niyfol itgz* f:2d* 3 b*iyk*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 *vp1er 3gey tbtmtw66o+1x(hln3e)n in an open pipe of length L is 200 Hz. Which one of the following frequencies will not g)tt3l3e txnh+o w np(r61 eve6y1b*mresonate 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 fundamental frwqa3tg04 2 ,gkdev p2 .vplod)equency. Which statement 4owv0,pt)2.a vlke gg2d dpq3is 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,vxni+36u+hyxt;e+l hwo8n p 5 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 wavelengths of the th-h+nqlwqqo kz .8b* k3ree lowest to*ob+ nl -z8qqwhk.k3q nes 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 resonatm/:h z(yr0c hze in a closed pipe of length L is 200 Hz. Which of the following frequencies will not resonac:y /h(z0zmrh te 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 rcwl4a r9t; *emt6fns0rqk 3/c esonating at its fundamental frequency. Which s9efscrnm3ct ql4/rw *ak0 6; ttatement 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 1k+) o5qis vgwxh.l;o speakers driven by the same source. Each speaker produces a tone with a freque+;i) wxkgl5o h.1osq vncy 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,u. wyt1806l ys hsf;bpur(+s a 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 bqhi r3qbw,w0+0xahdg 3 ;f.cgeat frequency is heard. What happens to the beat frequency if the frequency of one of thewh0dhq3 bc.3g x;a,fiw0 qr+g 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 expl-h/2zyyu8o zyu l;tc );ls5 fcwvz+9tains

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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 statir7p:nq6u;m 3qbzpl*d sku8 mf5v (x1 ionary observer. The frequency heard by the obsep f85q q* uknu(;lzidxmb m3rs76:vp1rver 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 stationary observer. The frequ0q vhfe7nlld, j g94, lodl,9mency heard by the observer 4ml9g ,0vo7eldf ,jhln 9d l,qis

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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 wil8 kv) r7op9yjq(:q*d* ze(shm ejmj4ll decrease by a factor sj hdpez:qy 9lj4)mr (* o*e8 7vq(mkjof:

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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 frequ:l6( qagtl4zs9,dzn s ency 45 kHz in air is 352 m/s. What is the air tq nglzs9dzt (, ls6:4aemperature?

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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 sox4b7 2-p8qf c3ac8mod6ce rlpund 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 p zr5cm (lwf,e270pjgm /m9 ijhzsj-9emits a shriek whose echo reaches it 0.0250 spjj/ lmpi-fz9s9gh7c,m (zr5mwe 2j0 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 4.00 s. The ts.kwog 7.w h-oemperature 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 light 8q ) -11imomym,pnuptning, the distance to the lightning strikim1 8 mqo),p-uyt1pnme 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 s1fc/(n z .kilks+mv7k3xko z5 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. How decun,z :x i+we.(apf 1gep is the well? (Ignore air resistance, and ass. c1w+nfepi(: ,xzaug ume 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 frequenc-iv 6toe/ dwg:n+*hj ny 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 avf 0ogo 6*c5 8vilsf3ljhnc 98t $23 \; ^{\circ}C$ 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 f*6hfxx axm1u m0 h*4swith 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 intensityv6c93qz:bu (qgb eeor.j/ yhs c:h8i6wb)d9s 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 intensg/k jgfpapm 9u6cr06gp ,l3z1ities of two sounds with intensity levels of 70 dB and 401fjg al ppgmrcug 960,kzp36/ 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 enwisy2jg knj5(o27l o,:t3v ob gines in a garage is 100 dB. What is the intensity level generateyjojvt n5 kl,3o2bw27:(gis od 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 sourdq4bj57f iq5*)m v ravv/a7ukce that is radiating equally in all directi a/b4 i5rvjq um)d77* q5kvavfons 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 radias.m xwd/rzcz qb8i8eu3e:x35 ting equally in all directions u3e 83d8xmw z: .bsi/rze x5cqis
$6.0 \times 10^{-10} \; W/m^{2}$. 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 qka+p(pf)qnh:biqxb7)7 c 6 his assumed to be uniformly distributed in all directions. What is the intensity level at a distance 5.00 m from the dogkcnbqqh p7(f a)h6qx: ) b7+ip?

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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 bark pj9:/fnjym a3ing dog. What would be the intensity level if two identical dogs very cl:jaf/9jpy3 nm ose 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 levr:i uhb99,x3m fbmk*yel is 60 dB. What is the intensity level (in dB) at a point 2.xkrf m m:9h9by,ibu* 30 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 source is 95 dB. x6rjg m;j14iy At what distance will it 4mg ijjy6x; r1be 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 aj li qj).k rmp07v1mq) complex tone has a frequency of 1200 Hz. What is the frequen) j0.lkq )irvpq7 jm1mcy of the 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 pipexstl7-720t.m ezy d uq is 900 Hz. What is the length of thezu- d. q70 eyltms2x7t 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 ope 8awmc 944ezlxa0ql7n w*ln8camf3k9 n pipe of length L is 400 Hz. What is the frequency of the lowest tone that will resonacwkxal7w 4fm 9 08c9naml4lez*38 nqate 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. If the velocity of so,no2b,y ms5g*wg zo-c ex)s+1u 5,b9yhxitoiund in air is 340 m/s, what is the frequency of tx-,m x)5zo t 2by,o ,on1g cysigi5+sue9bh*w he 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 temperature is 48cut585fc l:halg4kh0vre c $20 \; ^{\circ}C$. 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 33f,adep*/j: cf 0 Hz. What is the freque p,ff*/da cje:ncy 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 shortest pipe clos aax(im 5mv55g74) -gxblfd 7yiu wyu3ed on one end that will have a fundamental frequencf mmuxa3 d545b) xi yy5-7i7vugla g(wy 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 a room where the temperature is +iqit : n3 vm36h/bukr$20 \; ^{\circ}C$. 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 z 8x*; 2l uxlfxq62z qfb3kr0jroom where the temperature 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 pl k t1ha+la/y5uzs 0u+84 ts* tqr8 xxqeqb5pw4ayed when the speed of sound in air is 340 m/s. What is the fundaux atr0s18wzuap syt*q+lq8qbt+e 4xhk5 5 4/mental 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 sqv2qp .i 1u/w,q8q brqk(d6e xame length: one is open and the other is closed on one end. If the fundamental frev pki/qq dw,8qu61(xbqr eq2 .quency 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 frequency of 800 Hz in air where the velocity ox-x*v+w7nqg r cv(s7a f sound is 340 m/s. How much farther back would source 1s+axvgv c(n7xw7 rq- * 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 side )d+3blkl jl ;aby side and driven by the same frequency of 500 Hz. If the distance from a person to one b)d3;+ljk lalspeaker 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 be )+qgspr+6r svat 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 th83zh 5z7jdepm2g-. uxk9bac qe frequency of a musical instrument. If the tuner hears a beat frequency of 2 Hz, what is the frequency of the instr3 8dmzc9k7ejh . qbp5u-za xg2ument?

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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 respecis8/y x:fyiaw8y.ad/a 0)fu0fvs jz1 tively.azi: y8 /f)v/sda af0u.x8s 1y yj0fwi What beat frequency 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 violins in an orctu .c4yn/xg 2p4p5)9nk,iv yatddl -ehestra are found to produce a beat f)e2 9 up45,avlg tcik nyd4ntyp-x. /drequency 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 approachzbql uk t1a.j/;ao:2oes a stationary 1000-Hz sound source at twice the speed of sound. The observeoz b1:l2 /aqua jt;ok.r 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 H6j xyk,*h5hdw6 ;t olhk:yh)iz) approaches a stationary observer at one-half the speed of soundhi y5 hk;)woh*k, jlydh 6t:6x. 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, f-n g*h0ixkc 3 y,bg:xglnz* 1000 Hz. If a listener moves with a speed of 30 m/s away from the source, what is the frequency heard by the observer? (The sound g,*yxxl cnh *bgf-,zi 0gk :n3speed 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 800-55i ij9j2u3nz) bw/qbtipt z*Hz siren. It is traveling at 35 m/s on a day when the speed of souz9q*j) wti5zni itb3 pu52j/bnd 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 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 1zf,w. 1y bqc av0jia(oaq:t8stationary observer when a train approaches with a speed of 30 m/s. The frequency of the tcb.(fozai0,tqv a1awqyj18: rain 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. Thetgxxt qa, 8v52sd ,e0c train blows its 400-Hz whistle. Take the speed of sound to be 340 m/egc, t vqx8at,0 sx25ds. 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 stationary train. The train blows its 40+ c6nq4ptqjp5 m) sbw30-Hz whistle. Take the speed of sound to be 340 m/s. What frequency do you hear?+nj54 3q)csqp m tbw6p

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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. The trainf;q pze, r4*dfi1c wo+ blows its 400-Hz whistle. Take the speed of sound to be 340 m/s. What f1* opiqw4dezcrf ;, +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 fit1m)ms;p/ds ;*w zgurom 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 acmd*)1;;z msptw/ giu stual 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 is 340so rz2 j*u)jgkdwu.2) m/s. What is the frequency heard by an observer if the observer is moving away from the traij)s2r 2kgowd.uz* )jun 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. Assu9ygayoaz pc/99zb9u 3 me the speed of sound in air is 340 m/s. What is the frequency heab 9gy3/czaouyp9a99zrd 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 :)m45x;nggq:+loyb pt ais x/the speed of an object. A 40-kHz signal is sent out, and a 42-kHz signal is returned. Assume the speed of sound is 345 m/s. How fast is the object moisnb :)q+a4omxt:pg;x5 gy/ lving?

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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 producl:d.r:e,wwb gv8g l(j ed 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 half-any v/o( yav:/zcgle of the conical shock waz/: cvovyy (a/ve 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 zh u, 3bd czcp3g4j16m3gnr e2flies from the United States to Europe with a Mach number of 1.05 where the air drpjc3bhe 6mzgc,3u1gn z 42 3temperature is $5.0 \; ^{\circ}C$. What is the speed of the plane?

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