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习题练习：Physics Unit12: Sound
本习题练习试卷来源于51fly国际课程 (https://51fly.win)， 为试卷打印版，您也可以在网站平台(https://51fly.win/)直接 访问本试卷的在线电子版并查看正确答案与解析，搜藏保存任意题目到收藏集。 访问方法: 平台首页左上角"通过试卷号快速访问"输入试卷号 70，并点击直达试卷；或浏览器地址栏内直接输入本试卷链接 https://51fly.win/test70.html  教师使用本平台可以抽题组卷或一键复制他人试卷，布置为在线考试或在线作业，全自动判分成绩一键排序导出，省时省力。
 作者: physics  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 followio8-waaabmsfl 3(5 tal6f 7;feng 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 conductjta35c5/z lcwed 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 souny;y*8aqmyi y2 d 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 velocity of sousb p.gv j et/5-/,db9auiwr 8lnd? (Ass9t dwj u-rv/.b8 5/i,lbea pgsume 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 Hz sound, the velocity of a 200 Hz sound throu0mw e5sa vf:h5gh air waefs5:0mv5 his

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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, the wavelength of a 200 Hz soiropdoh6,1ozs5c z )0und in ai)5 shz10or,dzc o6i por 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 fre z y2,c 0o3suv8 dfpzi1n.3gq(gp)eqkquencies 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 frequefw16naby -*u wncy less 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 wave1vc9zwkg2ny +s uniformly in all directions. If you move to a point twice as far away from the source, the frequency of the +v19n 2zywgkcsound 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, intensityqfgra(q y*fmozkea/l4-72; a lyzx*z;2 /fl j 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 qd0 lg6 va(lm /0orz9qd from the source is I. What is the intensity at a distanl(mlq /zrgd qa90o6 v0ce 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 sourcwj: b5xl e1uz-s 7s:- fstmcf(e that is radiating equally in all directions. What happens to the intensity of the soub(5 fetmsxlcs uz:7 -s1: w-jfnd? 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)vlj)pf75eqf nr3m 4q4z w8w 8-qtvbs radiating equally in all directions. What happens to the intensity level of the sound? It drops rbtq 4lvqqf3mw 7w4f p)jn5- 8vz8) esby

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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 :.pvjw2mtt/ 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 tone. What characteristic ok4 ( ,hi*uchz4vm)qjgf the sound increasez4hhim4*q jvk ug c(),s?

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16#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What determines "louujugk:n o :nvo 0,yn58dness" 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 a mok t /)tnszh/kl3x)7 susical 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 wgr7,b1 uf81)2 qvpizfobg x9g ater

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19#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Pressure and displacementjm64k q- 6ukvh6,;8 m.wkfy ee2ufite 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 stringqg4s.q +gdlk st)3 ym9 and the sound wave generated by the guitar as a d+g m9 q4t 3s.k)gqslyresult 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 ends, ths2b-)chg kis h rxx)-9ere

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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 lee gxgg5w(f8mb)z/ u;u ngth L. What are the wavelengths of the three lowest tones produced g5zm(ew)bx;u g8/fug 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 on9x.pqsf k s(8ye of the following frequencies will not resonate in the same pipessk8.9(f xyqp ?

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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/dqx1mx2mf (e-r6 ppw its fundamental frequency. Which statement ipm -x/2q(xwmd 16f erps 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, thp/vf mk80 ih6aere

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26#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider a closed pipa(r v::, wqmkp wd-ey2e of length L. What are the wavelengths of the three lowest tones produ e w-m:kw(:ya,qpv2drced 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 pingb86 )nipr2 ppe of length L is 200 Hz. Which of the following frequencies will not resonatg6r) 8pnbpi2 ne 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 resonating at its ful2d 3/vbr2jn+ai5 ip undamental frequency. Which statement is cob2/uinr+35j 2 idvlaprrect?

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29#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A person stands betwe:pmn5e*xe 66m1sq dpc en two speakers driven by the same source. Each speaker produces a tone with a frequency of 200 Hz on a day when the spescm:ppd 5 m6xeq1n6 e*ed 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 bnu9f gxlp; 4:seats, 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 ,skt)prum 3o37hkc7bxqwb; (dm5 3 clbeat frequency is heard. What happens to the beat frequency if the frequency of on7cs3m 3)o db mhb,c(qw7xk;r pkl35u te 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 explai1 8qfsyx) 6+bpdvwns -qj (o9rns

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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 frequency 0x fkg qch6akj;hd )4.heard by the obserxd) j0 gh;akc6h .qf4kver 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 stationac(dpqz/yn2 -f ry observer. The frequency heard by the observer2-ydfnpczq ( / 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-speebx9 q ijtcd35ktd )j)0+v2hx sd, its half-angle will decrease by a factor v)5q2+0 sxj tbjd) x9htk i3dcof:

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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 ultrasonn9+; :5smrxvkhdwh+ h ic sound of frequency 45 kHz in air is 352 m/s. What is the air temperatur; kv+wnh5:+hhx mrd 9se?

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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 io s.pqe kk686rn 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 aavg+go4/ wm(c shriek whose echo reaches it 0.0250 s later. cw oga4vg(/m +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 hedcj coeim41(hqvo ;,( ar 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 lightning, t wu j(*1:edxxmvx; qkp5(hj sa c8/ti.he distance to the lightning strike wqkxpj jhmx ;c tu*s18i: x(5d/.va(eis 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 clifp w*bby: 4y yn+vg-x+ nho2qc/f 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 (y 8 *ou2pq hkh)uh8 sir4dd(ysplash 2.5 s later. How deep is the well? (Ignore air resistance, and assume the velocityru( uhh 8p( 8dh 4dkos)2*yqiy 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 frequency 500j 7nh0pewbvxkjc ;ta:dbk 1v1 7r.2g9 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 auf8 3nyonz5i 4ir 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 inbc4 d6h*ulwpe-f u/wug i* m51tensity $10^{-3} \; W/m^{2}$?

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47#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the intensitxnfm m1t6 vkzt06q2 d(y 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 intensities of two sounds with intensity levels of 70r7 )p yxef2s ( kdx1wpra15u5wbzu 1dhdr2;x6 dB and 40 dB?2wd ur1 pfr x5zrhk b1ysd()e 6x2xwpa;5d 17u

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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 oy /4a26mj*9yx u) jgmlr n8 w;,ffnbwa garage is 100 dB. What is the intensity level gen;*w/9xy,) am8nbfnfl26jwm gr oju4 yerated 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 ofzmf9t3 8i+un0,zounw0 vaeb) 6.0 m from a source that is radiating equally in amozf+n 9a t)wvz,in b0u8e3 u0ll 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 source t3(a ; 24uzqer;m wxvvjhat is radiating equally in all directm uq3vxr;a 4zvej;2w( ions 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, whi7g121dinh1t2 e d,cn;mq*.n g0g uh5vvar vtzch is assumed to be uniformly distributed in all dire*50 2dzrt n21at7gmv,i 1h v gnvce;uqg.nhd1ctions. 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 bai zjb/r)qi z2h69je p0rking dog. What would be the intensity level if two identical dogs very ibpi2 qjhr)/0ezj 9z6close 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 su(* chohi,d ;yz ;w2liound source the intensity level is 60 dB. What is the intensity level (in dB) at a point 2.0 m from the source? Assume that the sourclio*cwd,2(; y hihu;ze 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. A1;6 lwncfffpq8z. auubsv96 1 t what distance wilf6 uq;6fa1 9c nu8p .fvwlzb1sl 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 tone has a frequency of 1200 Hz. W nk. tazvn;m 8ycgpe) 4458xgehat is the frequency n8p)en5y;cmtva8e4kzgxg4 .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 pipe i+i +n1vm*fa.cfpum- rs 900 Hz. What is the length of the pipe-f vf.*c 1puna+r+mim ?

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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 is; y na+gp(zu+czh 7frss+ a.);ia;gtz the frequency of ther a+ya;nzh( f;cs+pa ugs7;tgz+z.i ) 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. mx8dkg,)gzw/imi.2 ic*l p (x If the velocity of sound in air is 340 m/s, what is the frequency o)pi(ggkdiw8 , mzi *.xlm /cx2f 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 whlnh7; i)q7 j4pa*vb dcere 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 al :wwyu:*6kvk cl q. .*x1rdewt one end is 330 Hz. What is the frequency of the thirvdr .cul.w e1lx yk:* :w6qkw*d 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 shortesewsul+*m.k p ski ,*-+oce(cit pipe closed on one end that will have a fundamental frequency of 60 Hz on a day when the velo( s+csl*i kc pe+-k.oem *uiw,city 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 ro 0-4dkee)d- rtr6 cx 0.umy* +uiiisakom 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 87m/*aqp5xr qrn0.z4gv bfmz room 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 played when the s fhqw,t+3b0nr peed of sound in air is 340 m/s0fn+tb hrw3 ,q. 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 same lt0dixu +a8k6 xa 2iabisz,3w:ength: one is open and the other is closed on one+:t8 ,a0iuadixb zs 3w ki6x2a end. If the fundamental 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 emit6/ 7(eqkny+q avkij2b a frequency of 800 Hz in air where the velocity of sound is 340 m/s. How much farther back would source 1 have to7bqk +n(v2k 6 qiyeja/ 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 drivqhr/en w(4 yc .2oyxi-en by the same frequency of 500 Hz. If the distance from a y-oxq w2y(ic n.r4he/ person 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 Hz and 444 Hz. Whatj/ hiy p)4)sgl0 ia+hf 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 folmd3k :6/*dzy;urf5lj riy*w rk to tune the frequency of a musical instrument. If the tuner hears a beat frequency of 2 Hz, what is the frequency of t dd5 ll*zj6kuri:fmryy*/ 3w;he 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 are 6 m and 7 m respzqyu nv:, 570y2ul mltectively. What beat frequency is heard when the horl:5ulmy v tyz0qn2u 7,ns 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 stgior66k n;d 1mrings on two violins in an orchestra are found to produce a beat frequency ofo m6;rgdi1n k6 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 sc4 w 8dqym- /f+e*geywound source at twice the speed of sound. The observer he*+g de w8 y/ywmfq4-cears 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 observer at1r7b arezx)l lu;p6d) /um6ym one-half the speed of soy6ru1;zb)l)m pem76 xudr l/aund. 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 1r pmj2 -dq+o7e000 Hz. If a listener moves with a speed of 30 m/s away from the source, what is the frequency heepo j+-2 rdm7qard 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 ;hg.s yx.xfbav9x m(6-Hz siren. It is traveling at 35 m/s on a day when the speed of sound through air is 340 m/s. The car approaches and passes amv6.hx;bs.9xa g (xyfn 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 w7g,h f0m(y ;0o uvgk. vjtpt:heard by a stationary observer when a train approaches with a speed ofwp ht 0u7yv:j(mkfv0.g ,o;tg 30 m/s. 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 whistl/cu3hj +jonb tgho*o*w(v ..ve. Tao(oguvbwn jjv. .t**oh+ c3h /ke the speed 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 da emw/; g ,m2wzhxg5hs-y(rc0r 8a y)toward a stationary train. The train blows its 400-Hz whistle. Take the speed of sound to be 340 m/s. What frequency do y8csyhea -d wz(x/50g2 ; gwamrmr,)yh ou 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 5wow1bi(bv -ifrom you at 120 km/h. The train blows its 400-Hz whistle. Take the sp(w v5-b iwi1boeed 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 5 qnd +q3mlzu27 r5pfyaway from 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 dr3 m7 uz5f5+qpyln2qis 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 5,8 w8c jiexoh u0;gix+hx 6uzHz. Assume the speed of sound in air is 340 m/s. What is the frequency heard by an observer i u0w 5he,hxxcoxgjz6 8;i8+uif the observer is moving away 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 traxgbs(8j, .a q4u 7xyfhin 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 approaching the train8 y.j f4xxg7q ahs(,bu 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 obje 7+jf6j0i 0myxow cr/mct. A 40-kHz signal is sent out, jm6oy+w 07/0fjxrcmi and a 42-kHz signal is returned. 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 wave produced by a supersonaa h0mszx 2x 4tc29bpj 4ze,(tic 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 il8m)z8r nt gcr( wyyj5i ,z4(zs the half-angle of the conical shock waz)t8,(igzlcymz y rn4wj(5r8ve 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 States to Eurak7+x1 xs29fedy/x e mope with a Mach number of 1.05 wh19 +sey/ x7 xefamkxd2ere the air temperature is $5.0 \; ^{\circ}C$. What is the speed of the plane?

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