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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 following3 ey3 +kiwhm*n/8sn vo 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 throughugis uuyrjc 5 r2)*7o-

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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 roc4:wezpai 8 b6d?

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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, wh 7xxsfk//n2uvb0n t.l,tt237h nu n/dc9ym qyat happens to the velocity of sound? (Asstxnvd / qmyt/b3nuy7hu2 x/nk,t9 .f2s0nc 7lume 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 spa(g6-fej,3 m mleu4t c x;-ssound through air e34peltm;xj(ug 6-f ,c- sams 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 wavelength of a md- -/j pv,ya5 my-l1qne ++vs,y bgtb200 Hz sound in ae,y ,vqj-vdnmay-s+m -l +bp y5 bt/1gir 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 frequencies greater than 20,000 Hzl1d 0b-ly8 uufxb h71s 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 :q0wl//px r,2lv fmtf 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 soundcg*65 m)p eddj(/ snra source is emitting waves uniformly in all directions. If you move t6g/rp c(d md 5j*)saneo 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 propor-h45xagzxy+t tional 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 roye 1sw3cfvev) r- 2s2p.hi1distance d from the source is I. What is the intensity at a disevpc1w2 -y1o) frh23se .vi srtance 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 distu3o+ kic h0y vfiyy: eder(.al71:d1w ance from a sound source that is radiating equally in all directions. What h fd eeivacu0wk.:1o h:d+yl( ir1 7y3yappens to 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 sound source tu0-m zb ; lg*i.njbj2that is radiating equally in all directions. What happub 2blm;zg j*ni-tj0.ens to 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 becomes lf ))b47e,;rmxcclwhr9 f2mix ouder?

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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 spe/h c*6fw;*q13od 2onurvalfqcu j79qaker emitting a pure tone. What characteristic of the sound increavw7juqd*lu62qnch1f oa9c3 o*/ q ;rfses?

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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 gc5o0*ir 5uylxsb v+) mk.jppw8c*6 inote?

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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" ofpj m,f e)w3w(y(y0fh /o8hlfp 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 frzk2utb+fiq;.s hc,h9/oz gs :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 displacemefq0pz oj1; g fg+g;er6g2tq3 lnt 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 guitaph5gnv/ei4o5 pru o p:1uab8,) n mx*sr string and the sound wave generated by the guitar as a result of this vibration. What do these two wan g8ebo 4mv:ux /u5r p*1io nh,aps5)pves 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 bota ir-)yr -t+i 5lrkal;h 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 wavelengths of the thre hwgio7o tl*9ynijg9 :*r (hy0e lowest tones produced by this pipo0g* 9olwy79 ( r*i:jnti hyhge?

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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 anym0kct-; mf8-a(8ues + vz5jym vt1iu open pipe of length L is 200 Hz. Which one of the following frequencies kv8m-s5+8-t;uj iym0ezu (t yamvf1 cwill 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-gw42d r a r /oym7j30gc7acma fundamental frequency. Which statement is correc43m yar7 gad0/g7acrmcj2 wo -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 thbi5w0pt do1/f np k)r6e 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 .y+ch2 1lhobfL. What are the wavelengths of the three lowest tones produced by this piph1+b.h2 l ocfye?

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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 ofa ox :4v 8g.aeieku/.n length L is 200 Hz. Which of the followin/kav4anieu.o gx8e :.g 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 resonatin5uvwu*;)su*jqt; 0 p .x wzpbcg at its fundamental frequency. Which statem*zupqub; ws )0*tpv5wx .;ujcent 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 source. Each speaker)2 ziip*e :cii produces a tone with a frequency of 200 Hz on a day when t):iiepi2 z *cihe 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,ijr ur/0png3( 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 and5l5; p*ylpq6um5zx -fr9 ;b2sjvx gu p a particular beat frequency is heard. What happens to the beat frequency if the frequency of one of thb69u f*ysxv2pplm-5zp5;x ug;r qlj 5e 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 explain3r8 mo(.pi(kn;w4.s :l msavchygx+ d s

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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 fth2 qja3i;fqtj) giu8k9 *nu(o4 n :uobserver. The frequency heard by the observerq2t9ug fntkj)uif8 ;j3(u4 ho aqin* : 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 frequencp2xj5(r7 g5u cpnk :gmy heard by the onm( 25p75x p: jgcrkugbserver 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 i)9ghij *s, zdvts MACH-speed, its half-angle will decrease by a facto)i* zjhsg9,v dr 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 45 kHz in air is 35u92 /gdvva8g+r d am;a2 m/s. What isgv ; ra gu+m9daa2d/8v 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 sound in k/2 srdj2iy,nmyd(h;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 u(lydh zo5/jn1ow( w.a shriek whose echo reaches wwo.jhz1u(o l/ 5(ydnit 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 hear the echo in 4.00 s. The temperatvw1moetf )w 3 4lz;ub)ure 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 seeigkdu . qu-b6o(ng a flash of lightning, the distance to the lightning strikeo kbu(qd6 u.-g 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 tkl.nc35 )dyct ,vz0ocemperature 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 lae7s m7v/rdj;d ter. How deep is the well? (Ignore air resistance, and assume the velocity of sound is 340 m/77vme/ rjsd ;ds.)

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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 fs wcu1oj -0e 9hw ,rfar5qo9u(requency 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 atr-xf4k-k c0 fv $23 \; ^{\circ}C$ 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 -ls x*kj,dxhs 77 6mxllevel 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 intensityk )p2lmz. oil9 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 therjtj+9g, -vbqkm7*sb intensities of two sounds with intensity levels of 70 dB+j-gb *7sjbtk,mq r9 v 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 n)td 9f7 h44sws0ik6 w yow+itengines in a garage is 100 dB. What is the intensity level generated by oshws4i6+09 ny4fti7 dw)t wk 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 radii s.y/y * z8z0qlmc,seating equally in all directions* 0/s lemz.yq8c ziys, 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 did/40v3 xeekj1 ge+v tnstance of 6.0 m from a source that is radiating equally in all detgeekv x+nj4 03 v/1directions 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 pbbq0 pu87qx-t ower, which is assumed to be uniformly distributed in all diruqtpq08 -xb7bections. 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 distanceu3w/v(b gs -,chzip y* 5.00 m from a barking dog. What would be the intensity level if zp/i yw*3 v ,-hscubg(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 *tvus 32sgg3wm)dm6 vfgah .dft :s9c:l-l z. a sound 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 source radiates equally in all directios6g* 2lv v-fs g)dtg:.ma3tlzs. hcwu m3f9:d ns.

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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. h )0i i n9(ibe.y*sfkcAt what distance will it be 75 dBe k*y0i9f hns)(.iicb?

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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. Whatk)2cjf )ukw5 1hbumi/ is the frequency of the fourth1w ku5f) hkjmui2b/c) 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 pirg2a5xr6rpu lic 7.uv*g5ixdn f/:+ ppe is 900 Hz. What is the length of the pi*iic gx rn7/d 5 uflg2rx:+va.up5p6rpe?

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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 w pk7d0fukr/ernx/- h xl)5*ie2sr3pL is 400 Hz. What is the frequency of the lowest tone that will resonate in an open )70rs xxl5rk2 */-u/irpkd3e e pfhnwpipe 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. t/frdmr aw . 6q p: 2j/g7rb4eo6qgoy,If the velocity of sound in air is 340 m/s, w4 g6ofotrj6er2p/qgr a :,d yqwbm.7/hat 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 iybbr6b r)9 cw ixvuz8i3l)a.afc9b 0.d rz6+gs in a room 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. Wh809o4prhcnid84tfa r r m+/ 7ebet;5t-rj rydat is the frequency of the third harmonic? 70 et jaeoc5rhpd9r i- bt+d/8r;fytnrr448m

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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 dyv.3fb35iy rshortest pipe closed on one end that will have a fundamental frequency of 60 Hz on a day when the velocity of sounddb3v3 .r fi5yy 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 th6; vep h2d+flje 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 it+/ ips3rc 3troom 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 whs g:/lmj; nej-en the speed of sound in air is 340 ms ;j/e-l:jgnm/s. 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 length: rs.-spko cgwv q4n0c0* mh 8*uone is open and the other is closed on one end. If th8cuc -q0 .*or0mgsh*4p s kvnwe 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 frequen9n4svuqbq1 7nx/gj a- cy of 800 Hz in air where the velocity of sound is 340 m/s. How much f gqnj xb q/49s1v-7aunarther back would source 1 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 by sidepcs;z+ )*8hwj wh0s vy and driven by the same frequency of 500 Hz. If the distance from a person to one speakerh scv0)wszh;8*y+pj w 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 e-:7i8wr i iosthe 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 tunin q(h0st6; nl.mic(rhn g fork to tune the frequency of a musical instrument. If the tuner hears a beat frequency of 2 Hz, what n( .iq;n 0sh(ch6rt mlis 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 hord g/66rb(zed 0seuf 8uns are 6 m and 7 m respectively. What beat frequency is heard when the horns are sounded on a6(dg8e6edub rz /u0fs 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 mo6swkfd*s*1xgk 4o /in an orchestra 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 would bring them to th sk4go1*x/d kw6s *fmoe 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 sy1oyzp1:w li2 ource at twice the speed of sound. The observer hears a 2yo z1pl1:wyifrequency 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 frequ6(/gyq-xf0oz+m01 dtusiddf/x iu 5fency of 1000 Hz) approaches a stationary observer at one-half the speed of sound. The obser/qzg0 x fos xifi( f/dutu-16dd+ym05ver 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. 7ocnhvnm-c gh,)nfbcc h w;(,8 bis8s0 pxu)+If a listener moves with a speed of 30 m/s away from the source, what is the frequency heard by 87sb+n fn) b; uvc0,pw(hgcmniho)xh-8c , cs 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 traveling at 35 m/s on a day when the k e 0,h8lbp- oq*wr,twspeed of sound through air is 340 m/s. The car approaches and passe,lwp*eqk0b8- htwo , rs 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 heatwoari 7 sc53jlo xu+ isvz6 s7,7 -imi:/6sjtrd by a stationary observer when a train approaches with a speed of 30 m/s. The frequency of the train h, x ol/ vt5josai s 6ruz7 +tms7:i76sw-i3ijcorn 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 4:*r(4z04wl comcu obhk h.z0e00-Hz whistle. Take the speed of sound to be 340 m/s. What frequency do you hear4m helwc0 4kzr 0oc.bohz*: u(?

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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. lyma 4qj2kq3( The train blows its 400-Hz whistle. Take the speed of sound to be 340 m/s. What(m2 qyk3alq 4j 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. 4mrfl t:(q t. thxy9;n The train blows its 400-Hz whistle. Take the speed of sound to be 340 m/s. What frnt; t hrq:y.(4t9xlm fequency 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 kzz zizh-ns8 :-m/h. It blows its whistle, and you hear a tone of 408 z zsi:nz-zh-0 Hz. 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 horn is 500 Hz. Assume the speed df-n d :7cij3ldfk-eev, 4xj/of sound in air is 340 m/s. What is the frequency heard by an obser3,edxdd v7ec4f-f ln-jj/k :iver 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 is 56x2zysx )ajo8 00 Hz. Assume the speed of sound in air is 340 m/s. What is the frequency heard by an observer ifz)62ajx yxs o8 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 the speed of an object. A 40-kHz signal is se.foedpw(:q 3b(eio e i55; cllnt out, and a 42-kHz signal is returned. Assume the speed of sound is 345 m/s. How fast is thli(io qpc; l(5owe.fb5e: 3ede 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 supersonic airzyz*x/2 ibl(zgz.gk;x/k 5m14n s pmvcraft 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 Machszu lxu*eq)-kr-:p n*q ne /3 :lqjh.x 1.4. What is the half-angle of the conical shock w:nq-h)./ker : qquxn*uexz*s lj-3pl ave 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 Europe wijw-o)/5kwe o pth a Mach number of 1.05 whwo-)ope5w /kjere the air temperature is $5.0 \; ^{\circ}C$. What is the speed of the plane?

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