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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 fala ;ckxzds*n +4rqo6(0 r/jpeuse 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 faste/7riom0+tkzdi+o c 3c 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 6 n+x(vmz:kd ssound 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 th :eh3tlg wt0 28rutrk7e velocity of sound? (Assume th 7:0t3elutrwht rkg28at 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 20k,qdlkkzit ,3:.e8 h6gryjjdcb32 w 60 Hz sound throughhdiwz lj:r3,ct3,j yb kk.g8d 266k eq 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 wavelength of zsi8l/2 zzgvl :fng,ah. +m5e a 400 Hz sound, the wavelength of a 200 Hz sound in 8zni .zeh f gg+, als5/lzm:v2air 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 frequp)b3(aidg9plg -( eb oq0qh -kencies 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 are6p,ro jjy:pk:v8szjt5x (eo6 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 wave1 5f4v:f tpre(ur- jlts uniformly in all directions. If you move to a point twice as far awafuv( 5t4 p1l-t:erj rfy 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 l7 +l9 sl:jzkuw/q uhl4vf2) rwaves, 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 sa*ty m/yp):rs: jib;k ource at a distance d from the source is I. What is the intensity at a distance 2d :yrb*a;yti: pk)m/ j sfrom 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 rk4(l y4 xl k(qv;lg,ox7m m8y0hlo2nqadiating equally in all directions. What happens to the intensity of the sound? Il48; omv x7yqg mx4h2k,ky lqnol(0(lt 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 equally iny2ssv-.pn7ks .9 qb nv all directions. What happens s.7kn-sn. 9vyvbp2q sto the 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 sound b /,w0ocvv o 65nrbraq,ecomes 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 speakerd*gf b4chkk xskii );w2u- xi;yk29g5 emitting a pure tone. What characteristic of the sound incrf sk5*ki wyd;i;)c22x 4ikgbh xu9-kg eases?

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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 musical note? ei4g,+vfgjam36-qm: fvjt 0v

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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 d(ov.p ;t3ijj 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 *:ri+pl8, n9m tnmjufom 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 waves(2 d,0jdzunf74nw nzg 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 strineo-bx6 :z- f4evl,cqhao85fd6-eis ,wsv f9og and the sound wave generated by the guitar as a result of this vibration. Wha4odf6e: h ,5o 8lev-sqowsxi-f 9a-e zb,f6vct 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, thejt z)+mwkk/ l4re

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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 txcak1xtd+ ;ihc0 0q rn7e7z )the three lowest tones pro1e arq7cx 0x0t)d; n +cki7thzduced 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 redgtx9r . q+1ozt0 i/(v7nbsb fsonate in an open pipe of length L is 200 Hz. Which one of t/t0 .qdoxb f+b(t7r s1zi9g nvhe following frequencies 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 reu-tqdh;.xrf9 sonating at its fundamental frequency. Which statement is correcq d-h9;tx ruf.t?

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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-wesm;(t 8t l , (g8rpm8dtkhe 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 three low7m)yl xd21ak3a5kqn2 (k ta8 tt.srsuest tones prody 3us 7kkt 1m(kl 2n dx)a2atar85stq.uced 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 pipe of length L is 200 Hz. 9ln ev/dtm z:k u8f/3bf0h0bo Which of the foll0z/n8e:bfu /of 93d0 bh ltvmkowing frequencies will 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 one end is resonating at its fundamental frequev /:;ge*l 3yco8 rjt:ahfast. ncy. Which stal83sf h: agtvy t*; ora:.ejc/tement 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 byueco1 o78mxcg( z, / 6zygzq(n*p6 wzh the same source. Each speaker produces a tone with a frequene1 qp(ozo /z wz,uh*y(xc6g8g cm 67zncy 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,c;uw6rowr9s - 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 togetheq4bvxu /k.r607 xt usnr and a particular beat frequency is heard. What happens to the beat frequency i sbu.nv u/4rx0qkxt76 f 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 explaibsj: jlc8ub -38w/p wfns

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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 a;zfo ,-w4-ttt*.oca2 v yvpc frequency heard by the observer,*v-tzoawy fc poav4-t t;c .2 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 freque 09u8tywymqgu7 esm-3ncy heard by the oswmgq978- uumyt 0 y3ebserver 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 hacyw o mg:xgsbn5z,.72lf-angle will decrease by a c, m 5bnys7zwxggo.2:factor 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 ultrasonic sound of frequency hmo5zyxjfs* 4. u suyou8.2x1 45 kHz in air is 352 m/s. What is the airyx u.fysjuso25ho1 mz.x4u *8 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 speedbews(7z-n5, au1wi0gyt c 2l* gn 8qqs 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 sound in air is 340 m/s, a bat emits qi2wc;hklt / :a shriek whose echo reaches it 0.0250 s later. How far awayc2qw hl: /itk; 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 4wk7ydkn6 m2m wqu 0a97x7yz h* q9:.ym0bkqgx.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 aqp 9rqugn5njq-t61 qe+/gs f: flash of lightning, the distance to the ligs/ -5q+pjq 1q6nqgr:negtuf9htning 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 ted cd82 yh 0bb7ai /b;gjf k;qe)woa+l)mperature 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 isk m;4l3ctn57yga r)le the well? (Ignore air resistak ntg7ec54;ylr am)l 3nce, 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 frequms * jh.+fepqi+r9 qv(ency 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 ta7-xk v/im s)$23 \; ^{\circ}C$ 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 so/ja 3b asol cf1*x.8hmund 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 of a 7 f1my da6svu6 cig16ilcb .g97y2yf)i 0-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 70s8rawk1:vx9lyo84pspuft+ z0 ua(l mnb:y*) dB wkzmuyon1 )9svup 4axtl sbr:f (py 8*0a :8l+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 enginem4-6,g6k,1 pzax sxo-i eteqms in a garage is 100 dB. What is the intensity level generated by opezxxs-iok6 4,qm6a1etg ,m-ne 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 7 :h(sxa5 og4actk6qoa source that is radiating equally in al65cgost7koah qa( :4 xl 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 that is radiatin:0fupb: o s3. btyj h,/5ryiuln9fjz7 g equally in all directions f 5l o7,/yj.t0snbz ui uh: :yb9j3frpis
$6.0 \times 10^{-10} \; W/m^{2}$. 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 abouthugte5 w-gqk4v1-7s tn q6n9 o 1 mW of power, which is assumed to be uniformly distributed in all directions. Whho4 s9newg1-qg 6 q5tu7-vntkat 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 )h+ns11lvh xu d )6wlwa barking dog. What would be the intensity level if two idw+hv)16x nwu1sh)dl lentical 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 inten w8jcse8g17 zcsity level is 60 dB. What is the intensity level (in dB) at a point 2.0 m from the source? Assume t7cegw c88zs 1jhat 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. A vhs;ul4j;4xat what distance 4a;hj4 ;slvu xwill 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. What is the 7khh0 t us2pirvuoo3k( ry- /p/k,kq4frequency of the up/73t(phv-0rsqkk/yohuio k 2, k4r 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 is 900 Hz. What is thaev7 on6 n4lm(e lengt(7mo6ena4 vnlh 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 anekjr; j/mq:n9t1gu 0 )6 hbsjg open pipe of length L is 400 Hz. What is the frequency of the lowest tone that will resonate in an open pipe of lengtrs:hjj/qb;tu6 m0gek n g )1j9h 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 s hez x m329je(wn,cx+dound in air is 340 m/s, what is the frequency ofc, 9he2n w3dzm+jex( x 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 g;q 2l mf)iez-amktbs 5.rlw):xm (e,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 ird2pulz9uy*f2 r1m fs;t97 w gn a pipe closed at one end is 330 Hz. What is the frequency of the third harmonic?l792pyf rm1wf2uz9g d*st; r u

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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 one end that will have a fun b hg+)3gf:w gld-/qvtdamental frequency of 60 Hz on a day when the velogv b/ :gqfdgt -)wh3+lcity 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 whejlc).r( g 0b5vajgqqmj8lr1x h17x 8kre 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 temper .ahw z:*ien8rature 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 0.74orqp02 8nb: gpdw+ cd5 m is played when the speed of sound in air is 340 m/s. What is 4 8owpg+rcd2 n db:q0pthe 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 open and the oth-8tj rk )hd0lher is closed on on)rjtklh 0d- 8he 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 emit a frequb ,iu;.dpebtr y+b+* xency of 800 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 no souub+*.ri,+p bd y;bextnd?

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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 drie 7.rsvat4 b yruwl23s (fnield2;i9.ven by the same frequency of 500 Hz. If the distance from a person to one speake.anrd;4ve 7i rbwe3 2ss9ft. l2u(l yir 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 i r)z,nj, x*ig+bnqw+gbv s.)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-H-s9j/a27cie,ge pp wwx2 z0cl.wi g 4vz tuning fork to tune the frequency of a musical instrument. If the tuner hears a bei2-lp,e2w07 g cajxz9/ spv4iw.gc ew at frequency 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 vz;z 3:kjesb3v:my *pxju 4c 3by two horns are 6 m and 7 m respectively. What beat frequency is heard when the horns are sous xby; e3 vjzu3pkm vz:4*jc3:nded 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 orcheycek86qdc o -7stra are found to produce a beat frequency of 2 Hz when a frequency of 660 Hz is played. What percentage change in the tension of one of the strings woulc7 8ec6kd-y qod 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-H32lev+mui.ar p.up7zb42xc,q ud eo0z sound source at twice the speed of sound. The observexcoa2ip43 veequ2 7urpd0b u+,.zml.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 Hz) apprd)zg8mz 8 :j0bijl w yh1)vn3coaches a stationary observer at one-half th8 zjlhn:vjzcdb)1y 8m )0iw3ge speed 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 listenzu .lr)cwu 7t3er moves with a speed of 30 m/s away from the source, what is the frequency heard by the obltuu zrc)3. w7server? (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 tri r14mp,sxv35(auxhc aveling at 35 m/s on a day when the speed of sound through air is 340 m/s. Themh v5 sr1(pauxi 4x3,c 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 whene4z j3uxrs;2w a train approaches with a speed of 30 m/sx2z;jwus 3r e4. 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 togx ;3 v7m5otrwward you at 120 km/h. The train blows its 400-Hz whistle. Take the speed of sound to be 340 m/s.; 5og7wxvtr3m 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 tranv;byi2dx ;4 / hcc3kik*v 0wnin. The train blows its 400-Hz whistle. Take the speed of sound to be 340 m/s. What frequency divbwnc;nh ;/0vk4c ix 2k*yd3o 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 iv(oly:a 1*p 73p qcqn400-Hz whistle. Take the spv q1 q7ycna*opp3il (:eed 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 away fxc; ba,mme/h ,rom 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 actual frequency of cmm e,x,;b h/athe 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 horna ll xaz z,ja5(.l,7wx 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 axwl .5z xz la7a,alj,(way 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 is 500 Hz. Assume the speed of sound / b bp.j,b8heaak,1rw in air is 340 m/s. What is the frequency heard by an observer if the observer is h,rjk,1b8.e/ aw babpapproaching 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 object. A 40-kHz signal is sent )v)0hi.4krsl cgoiv 9out, and a 42-kHz signal is returned. Assume the speed of sound is 345 m/s. How fastkgc0)rlh)o9sii 4 vv. 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 supeyjfd1-tc+h pka3 fk-:rsonic 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. Wha-vqen gh/fvx j 1t++/pmyig 7l4p4 v8pt is the half-angle of the conical shock wave fv48jqi/ty p+n4 m gp7-ev+/hx glpfv1 ormed?

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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 Eurog0sax qr3,p7h3w*nv m pe with a Mach number of 1.05 where the airhn0 s*pqxm 73gvw3r,a temperature is $5.0 \; ^{\circ}C$. What is the speed of the plane?

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