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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 k5ers*5cm vcy, mb,4kfalse 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 fgbyv.:v/ 0rhconducted 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 so tm7 gk83mvea)und 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 i(46iwd8(rwj l ts i(kthe air increases, what happens to the velocity of sound? (Assume that i4 iiw(dlk j(8sr t6w(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 ver c7 ksq;gm u5w,g+alvk:+q-slocity of a 200 Hz sound throu qgs 5w:,l+kqc7ru gs+akv-m;gh 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 a 400 Hz sound, the wavelength of a 200 Hz sogsbtv,;oy6 unhg+qb6 op :r 7)und in air iu6b,t nohysobpq:r+gg )7 6 v;s

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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 grea n6ns r:s8fe.kovmf:r6 x5rd 9ter 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 les0tn kk bh7jpm)b1 +j9us 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 e v3uo5h;kh (ppmitting waves uniformly in all directions. If you move to a point twice as far away from the source, the frequency 3hpuhov;(k p5 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, in gu bdvm,2vh2 i),vl*utensity 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 from the source is I. 2e twag;g+lt cavt6*:What is t taga6twt2+*:cvgel ;he intensity at a distance 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 source that is radiating equally im; h0mba r ;eprt.;3uin all directions. What.ht0u3;m r;ia;eb pmr happens 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(s n7vva tlsz-r7f,n; from a sound source that is radiating equally in all directia sv7l - v;stz,r7(nfnons. What happens 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 dvb+;0ri;,j3 ms tc mh*6vhlhsound 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. W fo8)u3 ;e z;9svt8yckaqcd2rhat characteristic of the sound in 9tov 38)fsckrcqu y2ae ;zd;8creases?

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16#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What determines "loudnlw5 7q9 veip)*hvu(skess" 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 musical l9v7i mry9 +nfnote?

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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 ;yopcz 5 )cev zmc1)+xn/ua4my.;s smair 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/5yg+l3 +idl(7*ifh * hrwyp-hvrqd e7bx w4ment 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 string an.vd9spz xn5qmy2 r: +e /6izeld the sound wave generated by the guitar as a result of this vibratvensm d r:pe2+.95 zqx zliy/6ion. 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 endd)az/ hbipg;( s, 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. z(nuz /5 g m)rr-to pw.u+pnzx v)z*+e What are the wavelengths of the three lowest tones produced rzn+ep mv)uzr5w- ou.*ngztpz/+ ()xby 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 p /oy+5iid 0xs -l d;rij9lo;neipe of length L is 200 Hz. Which one of the following frequencies will not resonate in to exi5-lryn;09ilds j/i o; +dhe 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 frequenaa ,i+6 (mezi nj)hfep4:pmk) cy. Which statement jkepm4(mzp: e ) 6iai,fn) ha+is 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 ba,y l4r6ls5y68xsn:gjka 3o6crrg- which is open at 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 udvob0c r- h86L. What are the wavelengths of the three lowest tones produced by this pipe?u cho8r6b0-vd

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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 uz)-sbz84rzk)ft k a4zutp3* pipe of length L is 200 Hz. Which of the following frequencies will not resob4zz)kktruf8)a *-s3p 4zu zt nate 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 fundament(+fpt 6op /bfral frequency. Which statement is correcttff +(po6p /rb?

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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 shelte5inq jd ,;*pnjv e yr853 /oe5f+ource. Each speaker produces a tone with a frequency of 200 Hz on a day when the speed t/o* je lej e;dfiqyp3 8vn+,55nhr5e 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, the two sound waves should h 7jdqv b/g6fi z8z4ml4ave

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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 is heard94n plik 4tzg-. What happens to the beat fi9zg k-lt44p nrequency 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 explainp wo1* tll*vqd ,m97qis

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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 frrg 8o1i9d 2 f8mpanr*lpm17okequency heard by the observenp1odfplkag2789*rom8r m i1 r 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 fbysub yt:jd4cbv)bx p5o :: 99aty.xtf w/39urom a stationary observer. The frequency heard by the obser 9:3 b5y xcbjbf.9 by/:)ut9a:s dxy4owp ttvuver 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.k5vts,q d+rqqj6k*s e 9:m hb will decrease by a factor of::kd* h9bsk6q,q q jmse v5+t.r

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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 fre+7sjr2yg jr hg-k)/ nsquency 45 kHz in air is 352 m/s. What is the air t y2g-ssh )rj /7ngkjr+emperature?

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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 soun8 son5ts 6(tzpd 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 w(phh- 1 b9. 9yh.*uwmqt yj kl7dm0mmemits a shriek whose echo reaches it 0.0250 s later. 7m.9uyh myt-q0mb wj1(p hldw*.h9mkHow 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 ech6n r3o 8)lh0euw(a mqbo 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 22h)s uudiz7y6h5/ z/wnym b da flash of lightning, the distance to the lightning strike is absdwzu z 7y5m/)2 h/dnhybui 62out

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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 o 2, 7fjpy/tmogmz-ksx*+0p itemperature 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 wmfu hu 6r. *aiq5z*s2flo6ew9 rt8oz;ell and hear the splash 2.5 s later. How deep is the well? (Ignore air resistance, and assume the velocity of sound is 340 689zsztr. m a *;fqi52fuh*orluo6ew 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 aija )ilrc w+.p)r 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 airsmptt48vp8(: su 09m lg1xs twhj/3yl 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 ; ;3 o9 m4p:luyvadldoa 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 px .:agiod./ bm9c )wd4m l5ikof 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 ungm4 r 2sk6jh8 7,yelna8:ft 70 dB 2e:t7nk ajygfh n8,rl u6s84mand 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 garage is 100 dB. What is the ; ,lpcf9p8mw6+vyt jn mg+a w(intensity level generated by one engine,+p wvmatg jfc8l+ ;mypnw(6 9?

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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 rwoq e1rao-k19adiating equally in 1 o ero9qak-1wall 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 raqeug,f 5)r tv1diating equally in all directionsvt) ruq ,e5g1f 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 1b qm+o,d y*b(o mW of power, which is assumed to be uniformly distributed in o ( *domq,y+bball directions. 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 d7ld (05e68rt es u k1yr8czw oy,k-ohis 65 dB at a distance 5.00 m from a barking dog. What would be the intensity level if two identical dogs vh7 o05 wykez- y,u(s 1ld6koct8rrd8eery 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 v p emfdtw/:351r ;rtthtz jg54xs2*j intensity level is 60 dB. What is the intensity level (in dB) at a point r5gp tdem4:2xh r;fjj t/stz1w 3v*t 52.0 m from the source? 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. At what distaenfps+a i qp-hio 7+04nce will it be 75 q+4i -hip+a sp o0nef7dB?

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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 uzgn7k,5r: u c23.hyjy pax5qa frequency of 1200 Hz. What is the frequency of the qcz .n2pgyuaur kx55y,j 73h :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 ope00 .evzc0dy bln pipe is 900 Hz. What is the length of the pd 0ye0bz0.lvcipe?

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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 ) gl)o;bt:2bnds4isf is 400 Hz. What is the frequency of the lowest tone that will resonate in an open pipe of leng4)n ssf;gblo)i: t2bdth 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 end ,bv puz8m)a3ss has a length of 0.80 m. If the velocity of sound in air is 340 m/s, what is the,)bvs8 z3 pmau 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 where the tempeqfpg.8pnz-eh (;zk6ur ,-d8 krsab; zrature 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 ec*kanp v9 ),/widtus-jzr;) j nd is 330 Hz. What is the frequency of the third harmo,pc*su;v jtkri)z- n)a9 /wjd nic?

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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 onq f,g+2n3uoz dftwno;5(.q ja e end that will have a fundamental frequency of 60 Hz on a day when the velocitynqjz w fgf; 2,u q(tadn5.o3o+ 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 the temperatu*-nlcp :tsh 3h:0z, t:dfhbtgre 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 tek2jl(a ys 8c1ymperature 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 air0l p0zs f jyc52p yfx+w8ytr(9 is 340 m/s. What is the fu0y0cxt s(5zj+98 rp fpylf2y wndamental 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 samk9u.uln*ab 9 )1 vjrihe length: one is open and the other is closed on one end. If the fundamental frequency of the open pipe is 300 Hz, what is the fundamental frequency u lbi9) 9an u.kj1v*hrof 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 Hz in 2 2cux efw/t wmtnj:. 0s8o1bdair 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 soutw.:2s wecb/0dx o t28nfm 1jund?

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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 t:gn qoq+j,2yphe same frequency of 500 Hz. If the distance from a 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 np :+qq oy2gj,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 frequen+xeae k q x(- 4rzkje9i9khr79zr0 zc6cies of 440 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 ts;8sa(8e ;rmgmu st. so tune the frequency of a musical instrument. If the tuner hears a beat frequency of 2 Hz, what is the f;s.ts8a (es;m g8 usrmrequency 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 ghy0lk a: 4nr c):fu90vtprw/horns are 6 m and 7 m respectively. What beat frequency is heard when the horns are sounded on a day when the velocity of s0kr:lct9p4:h /ng vurf ywa0)ound 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 fz 3 *wbz 8jbjtc.5n:bhound 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 twntb8hz :3. 5jj*bz bche 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 source at twice t3 nt 7jh.zi:: /wfvc8juxgq /ohe speed of sound. The observer hears a frequencyz7ofgxnc /vh3:qw8 u jit. j:/ 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;.fg/addt d( alrf s6* a stationary observer at one-half d(f* adtr6glaf/ s .;dthe 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 1000c+ly v(isl(b bsagu nx 3;f7n-f9 ;*ay Hz. If a listener moves with a speed of 30 m/s away from the source, what is the frequency heard by sf;b +asl9uc*(xfv3ig-nly ; y(7nab 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 h3jnx6pfn3bk /lko83( . edqzv(u c2w3 dke8b m/s on a day when the speedu 3f8(cde 3knbpvxwh zk3d (8k6e./3objnq l2 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 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 observ m t+i*dwuz10(h2 usroer when a train approaches with a speed of 30 m/s. The frequencyt* u1ozw2m +(h si0dru 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 whisz336.bf qpam5ue e +d 9yzjoaf2,o 1fttle. Take the speed of sound to bef da z 2+ f31 qapo9,jo3zfeutye.b6m5 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 toward a u1(mwe6rr;c- b m6j ag51suzdstationary train. The train blows its 400-Hz whistle. Take the speed of sounaerdm;u b611zjm6w- g5 urc(sd 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 k9ibz b w5x/llzp-7x y7/qpv8 pm/h. The train blows its 400-Hz whistle. Take the speed of sound to/7 zi z-7 5pql/pbxv8yw b9lxp 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 you at 120 km/h. It b vtnrquf .g:1 x)p25 /02clhwhkw, +wyhhum* rlows its whistle, and you hear a tone of 400 Hz. Take the speed of soundthm,hkwug2w0y/x w 5f .rvp*luh+2)hrc :q 1n 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 6y3cioy+j w 6rthe 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 speed of 30.0 m/s?ij +yw6c3yor6

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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 *oi8lqb 8ro9 yhorn is 500 Hz. Assume the speed of sound in air is 340 m/s. What is the frequency heard by an ob b98 *qyi8olorserver 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 the speed of an objec9j8 5 ibx+-8f7 tuhmw y.qgjwct. A 40-kHz signal is sent out, and a 42-kHz signal is returned. Assume the speed of sound is 345 m/s. How xu7fyhjt- wc b . j895+iwq8mgfast 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 byx k58eoqr9mclwx x/ z- (5t(wa 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 thewl+f5rfyp,+k5d mlfp+ hy/bp;ys / 4g half-angle of the conical shock wave fopl;rk fy/55yd+yglwpf m4,shb+f + /prmed?

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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 por yy+p87,omg3 o o0 gqglj9/the United States to Europe with a Mach number of 1.05 w7m o93qyjppy8,g0+oggr lo/ ohere the air temperature is $5.0 \; ^{\circ}C$. What is the speed of the plane?

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