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习题练习：Physics Unit12: Sound
本习题练习来源于题库网 (https://tiku.one)，是在线习题练习的打印版，您也可以访问本平台网站(https://tiku.one/)直接在线完成(注册并登录账号后在首页左侧输入试卷号 70 即可在线作答)，，作答电子化后可随时回放，查看每题答案与详细解析，搜藏保存任意题目；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。本试卷的直接作答链接 https://tiku.one/test70.html
 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 statem ak leh8hx*9 rce 9n;(i2zmzm2ent?

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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 faste4p;.wjzoh/vb hk .t c)st 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 steel m,6jiil;ccduz: zk/ st-1 y8 irod?

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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?k;qn kdo5xhy: xotu 25/aw5l4 (Assume that all other factors rwq /l knx5kaoxu4dh25: ;yt5oemain 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 veloctfkf c k/)pmr8+c(gto55, ypvity of a 200 Hz sound through air rf 8(/f5pompk + )5ygcctvt,k 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, the ogk+x8l0 ic4 l v:0ejiwavelength of a 200 Hz sound in air l4 x0+kov8e0 l j:ciigis

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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 greater than 20,000 Hz are:ryk,( o)q 3rintm.dfokx5 6d 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 thaffg+ ,b;pj/y yuw k7*qn 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 m1r4 mb fxy w*ooi6o8jp+a6/uuniformly in all directions. If you move to a point twice as far away from the source, the frequency of the sound wfi/r4+ p6uo8*mj 6mxy1o obawill 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 p)h sc80as 4*gpzly;weroportional 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 dge5bxs;d 4zmx+i :oris eaelt2(/f13 istance d from the source is I. What is the intensity at a dix fm 3ei(t r2e+sio xbae;zd51:g/l4sstance 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 so: 9nxa7na)8wm.usjy q7e i ,fvund source that is radiating equally in all directions. What happens to : ) i w7msy78uxqev.jn9,a anfthe 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 radiating equall7c86n,zgfey9 aag4 6/t i vvcry in all directions. What happens to the int,98fta c/6cgz 7ivnv4yrg 6eaensity 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 louo.-agh w.lljab6/- e gder?

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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 s0qljnvd ,7wvpf+u8i2l 14 kbpure tone. What characteristic of the sound incl21fsp0 qubj4lvwk+ 8i, vn7dreases?

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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 ioit,b(u u4a/ 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 "pn*my 7d4b,n(( bgjd qfitch" 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 wyk ,nvv,mc9nkc)j;a/ ater

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19#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Pressure and displac a;)ohs cl0rc,ement 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 .gk t1eo8 ylh zewk;/5on a guitar string and the sound wave generated by the guitar as a result of this vibratiokw;o t/ygehz. 1l8ek 5n. 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 whic:(md d, dycf tx4*o)bih 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 are the wa i )irq(uzmofh 9:+qvs *zfm9)velengths of the three lowest))q(* fir9q s mfhmu viz+oz:9 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 length L is r/cpplc .mlcj86zq 8-200 Hz. Which one of the following frequencies will not resonate in the same pipe8rz ccjq6m cp.l/lp-8?

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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 freqr9uuq yryp+k lh+i - uzo5jj-0:3kau3uency. Which statement is- ulrkj -0uq:uuopyha3ikzy5+ +9r 3 j 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 jcxxecue+q 85, 2jwx s8sar 0+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 of the threetw y9e:uzc../ j 1(mspv)kxh 6l,m dee lowest tones produced by this pipe?.9z) wphmxeke cv/,tld(ey 61smju. :

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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 :wlrk)u7 u5mrlao-zsn)w7 : tclosed pipe of length L is 200 Hz. Which of the following frequencies will no-)zr:au w7wtu )oklm ls5: r7nt 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 one end is resonating at its 9ai9w3 0i c 4.c h,kprhohywqj;(z4z rh1ptx(fundamental frequency. Which statement is coj rtwo 49w. zx qr0,zc9phh1 (3h;yha(cki4pirrect?

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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 source. Each np786i;ubfcaspeaker produces a tone with a frequency of ip8 bu;cfan76200 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, thej2 -hc1syuer+ 9 yzt l9yg1)na 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 pa;5 e se27jfgl)uvk 7zjrticular beat frequency is heard. Wh j2f7j;v5geue )s7zlkat 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 exrq dvv) /lmh5833l dkhplains

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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 frequencyg;r3u at3o/jb:76 gxuuy x:osd .y7y f heard by the observer:gux.yyjo; /f b 7xt3o:3us67duargy 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. ty-: t hqac/66qlqiokof 46o:The frequency heard by the obserqoa ft ho: 6i/tqoq-:l46c6kyver 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-angle will decreag tp5xgp3o euxdf5k849p2c1zse by a factor of:up1dt 49zp8g2oc 5xpkgxe 53f

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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 35pbfec ob j4-122 m/s. What is the ace4 21 pjfbo-bir 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 so2tsdrczz s5 bu9c-fzd5 vf/ q13;y gk0und 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 emits a shriek whosen2g9x(3qgoi *r f:zlc echo reaches it 0.0* rx3:q 2 (9lofngzgci250 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 the4;nc 6j f3lkep8p oq-d 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, the twej8275 ftph distance to the lw e27p tfh5j8tightning 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 a cliff on a day the temperatur 5q/8-ovqcqsfe 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*b;rd0u6h r 08b ctrup 2.5 s later. How deep is the well? (Ignore air resistance, and assu rr*tbuc;hp 08ub6dr 0me 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 aittd mfl 0ut 9926hlgwv3n /a;wr of 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 air at d)cv psxa.9+ ,lw1ptw $23 \; ^{\circ}C$ 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 mq7gr+2,8j fwqv326 rd woio p$10^{-3} \; W/m^{2}$?

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47#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the intensityew +2 1wy /mr) 23fu+g ozrfh x7up-sauq)xh)g 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 intewced :mah8t 3+nsities of two sounds with intensity levels of 70 dae c8h:d mw3+tB 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 gara/hlg79 :zxokptzzv0 uwb m0.)jpzr1+ ge is 100 dB. What is the intensity 0jowpr z)1vm7:. gzp t/+ zhzuxl09k blevel 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 that is radiating equcuw8-0eyn( c mally in all directim 8cec-0yw nu(ons 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 togpxf( b9 t8q9hat is radiating equally in all directions 9f( gq89opbxt 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 assumed to be uniformly c f19* uynzj/ndistributed in all directions. 9ufj1c/nn *yzWhat 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 ba)tso*-yod .f zrking dog. What would be the intensity level if two identical dogs very c.odf )y-s* tzolose 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. Whatq7u,yu6r 9/ th d0nqtdh+k3 dl is the intensity level (in dB) at a point 2.0 m from the sourc dul dh79rh3u0,6td t/+q kyqne? 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. c2p;mt;p5p7 ndad 6( ok7 b npflso-b2At what distance will it be 75 dB(-b afodtkd; pso 627lc 7 5n2pn;pmpb?

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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 12 d2ejxha:kb q4e0irr4d:8 d7 q00 Hz. What is the frequency of the fourth harmbqjd 2r4 rded4a8k7eh0i ::xq onic?

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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 Hz. What is prmor fx1z: xv8*/tn+the lengn rx8f omtpv/ xr+*:z1th 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 resonate in an open pipe of length L is 40kmju sd d2+t/00 Hz. What is the f2suk tm j0+d/drequency of the 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 m6er7o,be7qle(/a fowus-f t 2. If the velocity of sound in air is 340 m/s, what is the frequency of the secon7f(r -,soteubwf a l /67qe2eod 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 temperabfq jy q8:bqk(-15sziture 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 end1ghuh:c, ah; a is 330 Hz. What is the frequency of the third harmonich:h;ach u1g,a ?

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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 on oi vzohhr-vvlwmbf19 x*s2++:ne end that will have a fundamental frequenvov:2 lr+sv-izh9 bxhw*f + m1cy 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 wher ,nr36zdk:vs ve 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 inhecuv5,q 0* dt9p u+a3f-xw +r9 xguzh a 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 speed of sound in air ck:xe 06pexfr+x 6i4his 340 m/s. What is the fundamental freqk6x cep0+i4fx 6h: erxuency?

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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 opnp ps, cf5e3y.en and the other is closed on one end. If the fundamental frequency of the open pipe is 300 Hz, what is the fundamentac5 ys.n3fpep, l 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 Hz3z)-o mgdn*mu in air where the velocity of sound is 340 m/s. How much farther back would source 1 hu3mznm- o )d*gave 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 by side and driven by the same frequency oo qx2tfg6la,1f 500 Hz. If the distance from a person to one speaker is 5.00 m and the person detects little or no sound, which ofgoxq162,lf ta 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 44dj3 a3 q;avj(nm x.-ox0 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-Hz tuning fork to tune the fe8q sllj0/sk)vicim ;-8 k-yqrequency of a musical instrument. If the tuner hears a beat frequency of 2 Hz, what is the frequency of the instrulq q-;kjs8)v es08icli -myk/ment?

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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 ar3uwi;t)svfl k 6)jnn)e 6 m and 7 m respectively. What beat frequency is heard when the horns are sounded on a day when the velocity of sound is 340 tl3iu fknw;))j s6vn) 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 foundhv v3vcwbon,7:ik7x*tk 2+lauil:j 1 to produce a beat freqkukwc*jbti1:7v:vl2 7i n+hlv3 ,aoxuency 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 approaches a stationw yme03zlupk3m ,-r ;kary 1000-Hz sound source at twice the speed of sound. The observer hears a frequencyu-mke 0m,z3y;w rkl p3 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) approauq1 :gz,mjrgdq. msz;0 mq6 t0ches a stationary observer at one-half the spe:qtqg0zjmmu,6. grq1dmz s ;0 ed 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 listener moves withi)ig daueuplirj.5**r8 w ca-2a7q3g a speed of 30 m/s away ei)8wjra7 pr-2 ga*lud .aug5 i i*3qcfrom 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 traq 7,q bsqrxdju44:gq5olj y/d )/j0xaveling at 35 m/s on a day when the speed of sound 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 observej 5qq/y4s ,7u xqlg4qx:0jdr do ajb/)r 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 statio)k c u.0mcz oirm0 bmd*x)*a3unary observer when a train approaches with a speed of 30 m/s. The frequm*doik03muuz* 0. acrmb)c)xency 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 whist,or6h62zoq7dij at p6le. Take the speed of sound to be 340 m/s. Whapz6qj2r6i6t d 7ho,o at 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 pkd8u3i1xxqd g vqb 4q4 ajc2z;, ks+:train blows its 400-Hz whistle. Take the speb8 xkxd1 pz4dsica+gj: q32;qk vu,4q ed 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 train blows its (3zpli a, :xd*f0jsbdyld7b( m,1lqp 400-Hz whistle. Take the speed of sound to be 340 m/si,mdbsz, 3 qldpfdy b:((x a10ljl*p7. 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 km/h. It blows its.95supxrp0bi 0m); ddrx hxz/f45 z fc whistle, and you hear a tone of 400 Hz. Tak/h rb4d0r 0zuf;f)pmx .d p5z9cxixs5e 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 500ldaa*6 lf53ce:1ufrmqhbw.p*vw .h7 Hz. Assume the speed of sound in air is 340 m/s. What is the frequency heard by an obfl*7 1*3re.qhw 6mwfua.c5 b:val hdpserver if 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 train horn 1s;h b) dawyf54sh2npis 500 Hz. Assume the speed of sound in air is 340 m/s. What is the frequency heard by an sd1 s;hb4hn52 w)ypafobserver 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 ,bulk k,r 9s-ethe 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 ob9r -ku ls,ke,bject 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 supersonic ay a;hdp+hti 6j:k 7osx2izx uki/) n*2ircraft 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-angle of the conob atye/zk z:mfu.;5e,26mlh ical shock wave k z/m;:2bhuf at.l5em6zyo,e 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 Statesjtxm27 b7pl x7 to Europe with a Mach number ofmp2bx j7 7l7xt 1.05 where the air temperature is $5.0 \; ^{\circ}C$. What is the speed of the plane?

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