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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 stat-z 6efw f5 lj9vbfm.:fement?

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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 fagnaew3bfj kds:1g c *2nz,;7nstest 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 steed4a b:r58q ktgh 3sd+hl 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 velocity of sound?go5ecu62d c 8:/rovs a (c sruooae8:c g/526vdAssume that 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 8rq/)w b;qq3y x2u jb fa0pw19eqpun/Hz sound, the velocity of a 200 Hz sound throughwx13;/bjebqa0rfuqq /u2w)np 8p yq9 air 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 wavele)5 k1oqj4cnk o8v9 u3dlllb)5rw tr6v()ks esngth of a 400 Hz sound, the wavelength of a 200 Hz sound irl 68(tkcksr 1 ld)5owqv53 noje)k)9 luvs 4bn air 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 frequebyx;63hcf2 v(vtnf :qd: t 3whncies 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 * iq/ p-+iczpkxzh3 qnt/3n5wless 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 unifo m)wm,mrn vk9/*mb; vbrmly in all directions. If you move to a point twice as far away from the source, the frequ)wmv;*,kmmr/ bn mv9bency 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 divergingiex7 . 5z ymr7nop+nv8 waves, intensity 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 frzv(gi798 3yohziy . raobs 5l4om the source is I. What is the intensity at a distanc4yzi.o8zvlaib9rh(y 7sg 3 5oe 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 dista4e rl,;xgz cm*atrjl)07ey8ktfcd1,s ut , 3ance from a sound source that is radiating equally in all directions. What happens to the3xutm yza)lktt e0 cj , sc*a;lrr, 81dg47,fe 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 radiat,o; 6/szr6f4tvlu rcling equally in all directions. What happens to the intensity level of the sound? It dro, ruf/o4t6cr szll6 ;vps 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 qct;y7v+i);e u.ww c+w k k0rxa 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 aso 5l+*dth7a3 bp oo47pdq hj7 pure tone. What characteristic of the sound incre *4 b7lo7otpp+ 5ohq3h7ddajs ases?

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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 m2(rsc8.k,wtq +aj uujusical 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 "pi h;xi (4+ofnjxtch" 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 fr 9x4yqkt6)kjj- 5 tucqi-9vow om 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 displacem- xcw6 ,f7 ny/btu +sgzpus)l*ent 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 oyr+.f2qite)(7qq .6 vr rgqzgn a guitar string and the sound wave generated by the guitar as a result of this vibration. What do these two wavesqrgt 2z r.ie+ 7.qg6 (qq)yrvf 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 pipeb qjue/ xg(dnr;a59.kv x 0wl2 which 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 of length L. What artu, zeto9s6 ig(rwqy -r:/o c:e the wavelengths of the three lowest tones produced by this pipe?,iqw6 csz/:uo9 t eoyrr (tg:-

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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 resonate3e 7+ v3jky6k (cn/5lxhm zcle in an open pipe of length L is 200 Hz. Which one of the following frequenciesl 7cv+3kkmezlx5/6ce n yh3j( will not resonate 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 frequencbc5/+xc 9o:f sguxwd8y. Which statement is co+fow uxb/:cscd9g 85x rrect?

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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 ,e w:: jzzej0q9(crpi 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 wavelengths oty 29buphf9 y)qb/gb-kw 4a7yf the three lowest tones produced by this)24ybpg9a/9t wy f qyubbk7-h 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 reson 78r3+hbrcq)akt pzr0 ec 6p7fate in a closed pipe of length L is 200 Hz. Which of the following frequencies w767zeq rpc ra+b hk0t3)cp8rfill 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 tha1 l9dai 74+ng1; , -xaptkkap0f keone end is resonating at its fundamental frequency. Which statemenl p7 1tat4h1fak dn0;9x keapg-,+ikat 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 bv1gm9 gy7ingm )2a2az3 vr4l source. Each speaker produces a tone with a frequency of 200 Hz on a day when the speed of sound is 330 m/s. The)ml2 g vz419avbn2 gryaim37g 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 p4 y z)8jwzta(.k+ighwaves 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 frequency iqzg) 8he 0 gap4b (ncwp2at1(ys heard. What happens to the beat frequenc) y20c ptg(a4za1pb(weh8gq ny 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 i:quiji;47f7a8 g tlhs

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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 ff1 :m 3rwsgq 8 *lkc:.lv5knjmrequency heard by the observ 8::1rgk l q.kf smjwml*c3n5ver 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 statichq4bcrsit9k4s7 ++z onary observer. The frequency heard by the obsert4zqch 9b+c7r+ ssk 4iver 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-eap. *lq9 qxz7angle will decrease by a factor oq9*ezalpx . 7qf:

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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 tk zlu7xdj3dy2q.ag24acv) ej8 p.8y 45 kHz in air is 352 m/s. What isy7yc) zj8d2kgu.pd aqe.2aj 4xl8vt3 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 s wk:d(lqmufme2 : z8:cound 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 solw*fy2gvht2a s1/ x) tund in air is 340 m/s, a bat emits a shriek whose echo rgh21*x ws/lyatf t)v2 eaches 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 hearae l*hgq5. /8fktjr2*er 6doj the echo in 4.00 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 li 7rd icv,vo( y-lp64ypghtning, the distance to the lvi 64 cd7(vy,p-rplyoightning 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 , 8 naz;v3akkez+ e 9eolthkaf;:5tm5a 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 deep isj1m +fkb.2w7k++vcm tcztr p( the well? (k k(t c+2tw mm1cz7+r+vbf.jpIgnore 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 wave of freqf8q (k2cx :2c bpcowj/uency 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 atb0kz o, sibkj vo9* r3tmy4c7- $23 \; ^{\circ}C$ 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 ler;kj5g6 / 3 mke:oofc 1iv+dsdvel of a sound 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 ofwh1)1cue; ) wh tszsbgmu 4hn*ft)8o . 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 sounds with intensity levels of 70 dc)lhc5n s tg+c(ck5*2 7k7hbaslgvuoi ;e)1cB and (ivl5c)k ;5+ct7kusencc1h s a)*o glhc2g7 b40 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 2i:pfzj r73oo 6+fa fza garage is 100 dB. What is the intensity level generated by oneao3z:fr6 +f zo7fi2 jp 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 mo/icmeh,2wa uxwi4( ;l,o6yu from a source that is radiating equally in all directions h /oxmolc6uiw ; ,y, 2(iea4wuis
$6.0 \times 10^{-10} \; W/m^{2}$. 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 radiating equally i3fjjaa 5jqr7h19ht9g n all directija9frtjq3hg jah97 15ons 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 io74zlxphc :;a x:g0qo s assumed to be uniformly distributed in all directions. Wp; oqxz4x: hg7o0l:achat 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 dist ct(izr-fvmt/8 ku47r 8w rmh21fd*koance 5.00 m from a barking dog. What would be the inten rid h7(2umr1tzm4 8ckwo-f vkfr*/t8sity 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 in3/ 8;: 1qo fv 6 adncroxf9.nrrus/rzatensity level is 60 dB. What is the intensity level (in dB) at a point 2.0 m from the source? Assume that the source radiates nraz:noo3 x rd8 .q;/u/a9c6frvrsf1equally 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. At what distancxe-q gsjyjco1oj w1 f49:0 k*oe will it beejoyjo4 0:fqo cx1s*j1w 9kg- 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+ 6td ,siajy0i tone has a frequency of 1200 Hz. What is the frequenc t6d j0,iaisy+y 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 o g uol:pt,0jl6vv-1omf an open pipe is 900 Hz. What is the length of the pipv -p,:ogljoum10v t6 le?

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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. What ig r;mxd k09w *zcy(lb3s the frequency of theb3w(kry zd9;l cmx* 0g lowest tone that will resonate 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 0,zye: san+bh sound in air is 340 m/s,b+za syn,:he 0 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 i3litq 8cf9,h 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 q)q j,lbsv t .2b4qi .be6vpq7the frequ7qqtb)ejs 6qqp4b .v i.vl,b2ency 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 thekju( o60dcb a661*ap.euk xim shortest pipe closed on one end that will have a fundamental frequency of 60 Hz on a day when the ve 60j*ua1.6am(u d kpx okicb6elocity 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 th34mr *,hvn aics66i bfe 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 temperature wodlq0q6xz u7m(nybiz4m 0 2 7is $20 \; ^{\circ}C$. 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 shf,j:4( ro)t d altdx,tyq4 a(peed of sound in air is 340 m/s ,,aq((y44o x ltajt:dr dh)tf. What 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 sajcqgc (1(qw cte,0.txg(fb7 u me length: one is open and the other is closed on one end. If the fund(b t f.cx0j,cq7(gge (wcuqt1amental 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 frequency of 80g.tttdm e( c(:; -fmgt0 Hz in air where the 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 dt(;ect-mtmf gt:( g.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 50 xuy.srb1 ((3srlhv: a0 Hz. If the distance from a person to one speaker is 5.00 m and the person detects little or no sound(xr(r:bs1y v3s ah.lu, 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 beatk,6mcvm((yi8ldfd3 d3fp le9 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 tu89ikpo 95 :b8t t7gaoahaw0w ining fork to tune the frequency of a musical instrument. If the tuner hears a beat fr 8ak5o:b0 t9iw7owia8p tg9 ahequency of 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 produced by two hornvjb /ss12cmrw s2ram 63q8(prqed/ ;cs are 6 m and 7 m respectively. What beat frequency is heard when the horns are sound;/s2e82 (mar d6p/ rsrcqsqwb1mjcv 3ed 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 orchestra are found to pdleovi.g +,j 0roduce a beat frequency o,.oi0d+ lvegj f 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 stationary 1000-Hz sound 4wx0 kmraa 9i6m zbygji(j-96source at twice the speed of sound. The observer hears a fmjk6-z9ir(6 9 ya gwxj0mbai4requency 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) approacaa6kbke - qi2vj;;fm7hes a stationary observer at one-half the speed of sound. The k6 ;b-vi;jmea af k2q7observer 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 listener moves with a speed of 30 m/s d97ig6k1a2xvbo l sklv/2do (away from the source, what is the frequency heard by the g2b2sk/ix 7vllo(1o9dvad k6 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 iu868a8esszl day when the speed of sound through air is 340 m/s. The car approaches and passesleu6a8ssz i88 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 20t)ysrjcs :h::lkyc a train approaches with a speed of 30 m/s. The frequency of the train horn is 600: hjkts:ycycs2l: r0) 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-Hzd,4u6(4qg;k9qrfav* )hdz0i a lpkmr whistle. Take the speed )a lr, k 6f;d*uz4mg dhvrk4i(pq9a0q of sound to be 340 m/s. 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 lc s(km5+z n5qqg 2gjw8hu+ ky)v/t*n toward a stationary train. The train blows its 400-Hz whistle. Take the speedn2hq5c/mj* ++vkqy8w z)5gkl(sn ugt of sound 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 away from you at 120 km/h. The trwwuov*vw2 26 9qxd(cyain blows its 400-Hz whistle. Take the speed of sound9w (* wu2v6vyxcw qod2 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 yf;scklp.qz:r 8 3gq 4pou at 120 km/h. It blows its whistle, and you hear a tone of 400 Hqlqp:3 84frp gzk;s.c z. 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 hor( yc qe:i3oi5jn 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 away from the train with a spe q (:ci5oi3yjeed 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 v g7am f.exw0-air is 340 m/s. What is the frequency heard by an observer if the observer is approaching the train with a speedw fvxam-g.70 e 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 ann5l/vm pd)r5a0wfhss g5j3 c . object. A 40-kHz signal is sent out, and a 42-kHz signal is res3 wacnsd.5vr5)f /5jhpmlg 0turned. 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 w 6:hejypvv)d2*m hg:eave 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 jl2,f 8xy1 ipdf10cbythe half-angle of the conical shock wave focyf021xjyb8i1,f pd lrmed?

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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 Europe with a Mach n8qmj :h+ cp-ioumber of 1.05 where the air temper:qc mp-8i+ ojhature is $5.0 \; ^{\circ}C$. What is the speed of the plane?

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