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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 followin9tpwic bj (k+3g 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 throughvb;,fwx144m a: dyx w 7e8tlaw

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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 soun+0o1. yqbme tci tq6wm r8:kt/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 airfj+u7) iz o0(zip)sb 2auaq 15+mcw/:qqmpdh increases, what happens to the velocity of sound? (Assume that all other factors rem) i:o+miz25 us(+b 0p aj/h7aqc wf1dpqzuq)main 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, tn dhc;6a zy;8wkxepsbdr2) 01 he velocity of a 200 Hz sound through air d2 60y;8k1 pedscx )zanw;bhris

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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 H*f: 8; hlu;)a,evdukgywj/ /v* bx ydzz sound, the wavelength of a 200 Hz sound in airyuxf/w, *;uzv hega v jk:ld/b*;)yd8 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 Hz are caz :t/jgvle ,4glled

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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 1osj1w v0 a 8z, k6wdc(dj2zet20 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 uniformly in all directions.sq/wr)/ ws g9p4/+ysx-popd x If you move to a/x )pwrsodpxqgw9s/s p 4+-y/ 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, intensityc:fu/xhb* 8d v 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 aty/nur( -4rd 8kr0mxvt a distance d from the source is I. What is the intensity atrxmu84vr nyk d0/t r-( 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 sourcckf5;dj,+iudz v ,vd1e that is radiating equally in all directions. What happens to the intensity of the sounif+ dcvz1jdkvu5, d,; d? 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 r.3 c9a); gxsgevxps+rx z)fx/adiating equally in all directions. What happens to the intensity level of the sound? It dropcxx; .f+r) pvg/xsae 3 xz9)gss 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 louder?zujd;g)j-nz 84 v.y7f rg ih7b

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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 characteywce 8 ysvl,((;;*hkj 1brtpiristic of the sound incr; ,lwk jpi8(tvyh; ye(sc*1breases?

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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 musigmiba1jc 0a/* khjh5 :cal 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 . c+xdnz3z:)y up0v fwnote?

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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 k yk80mfl m-l.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 gzb)aj.mk( -1 t xp+whw5oz) xwaves 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 wavkd39v;o bkus1 e on a guitar string and the sound wave generated by the guitar as a result of this vibration. What do these two1kkvd ; sou93b 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 end4jvdl((b(cw9 jqr-q su7.yoh r6s2g ds, 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 oa*2f3yj ) phki w(kic8f length L. What are the wavelengths of the three lowest tia8h2pyc i3j *fwkk) (ones 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 200 Hz. Whichmj oj8g5i -v;s +gd*js7iqh k5 one of the following frequencies will not resonate in the sam ms gq+5oj-v s ;*kgj7h5idi8je 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 fundyv: iht(1upl; amental frequency. Which statement is correct1tp:u(hlv;iy ?

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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 cloy6isk 6hn-hijm a hs/ g4o+,bg1 2mgu-sed 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 waj+ou , x h4f 8eslupka2gjma0h59m- m.uy7 9vmvelengths of the three lowest tones produced b, ypv85o4fm0 j u am+h9xuk-9 hl.72ugmejs amy 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 resona -s3uudvh i* zkdu+o-.te in a closed pipe of length L is 200 Hz. Which of the following frequencies will not resonuh.- u ud*z3 vksd-io+ate 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 fundamicq .1lu6 o 0fjw0yds(ental frequency. Which statement is correcy 0u(06i1jdl o.ws fqct?

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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 speaker ,y7bmmqvt-k1 u c-hk)s driven by the same source. Each speaker produces a tone with a frequency of 200 Hz on a day when the speed of sound is 330 m/s. The persym tv kkm7b-q1hc u,)-on 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 / q7r e.pllpc* e:ucd5y yevm,f+5k 3zl a4e:fshould 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 soundedjin(+dm f4 e ga ,3z/j(jhxy*b together and a particular beat frequency is heard. What happens to the beat frequency if the frequenchj id+*3j(mj bnz a( g,ex/4fyy 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 explaiegy 2)*x/9 j 3vlotiwnj3f6 pbns

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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.;q-j.mo4 pb xb The frequency heard by the observer i b;xmj4 .oq-bps

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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 frequen-hs dsbo i14 it;8cf*o s :0kx*oxkcuiqk2; )ncy heard by the observer is -; uqht1xn;4s0k* i:ocb kifs8dxo )2o*kcsi

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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 whatrnn ufzhi 9* z *u0nq8r0;*gh1l3to double its MACH-speed, its half-angle will decrease by a factor of: lniuq3z08t*0hnu*z*ghnwhr 9afr 1;

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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 :ifxzkww 7e-;t3ve*b+0t gzd45 kHz in air is 352 m/s. What is thez 0tk7; 3ixfde:v-tw egw *z+b 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 air a7+-j)lcl * sqs f9fxidp3vi+l t $0 \; ^{\circ}C$ 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 e) los2sp16o6 q7jpqycmits a shriek whose echo reaches it 0.0250 s later. How far away was the object 6671oslsjo) yqp p2cq 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, a1 gbgfcr *i-p1ykvu )3q,e;cl nd hear 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 lit:ibsdd/ d08 evui: /, tdi)twghtning, the distance to the lightning strike,/d i/vi8t dut:0dtibe w ds:) 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 temsmh*+ )ru 6layn a((xhperature 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 q)lh)tmi h og0; 5/tsris the well? (Ignore air resistance, and assume th0gltqro; sm))hh/it 5e 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 o q q1st3*ibr0 :flbc)gf 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 aoj61uefg q*; /sus6 xft $23 \; ^{\circ}C$ 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 intens nbzv611v ocq* 2m.nd z+hjk0cnfq xd 1g5.w8uity $10^{-3} \; W/m^{2}$?

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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 .2: r3s w+j dljjdaxl: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 tw9+qzh8hx e1x-ca rhh .o sounds with intensity levels of 70 dB rx9ah zq .hx8 -hhe1c+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 garage is 100 dB. What is the insx 3r ydddcb6 *o.p k.dp ee10p39vwv+tensity level generade ex.b10vr*kp6p3.d cpy3v w do+9 sdted 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 equally,;w y/tife2yt in all directiow2;,ty tf/ eiyns 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 radiating equa 44kem;ex u.b(o)fafglly in all 4gx m.akf4o ;)ebfeu (directions 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 abo yrtb8(rwl4 )zut 1 mW of power, which is assumed to be uniformly distributed in all directions. What is t y)lbrr 84wt(zhe 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 bzx;:a/+ yt0ml mvg h)/q9kdsbarking dog. What would be the intensityblz): /hx; mayg+ / tmqk90dsv level if 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 a sound source the intensity level is 6s4 8 iitx) -pbiop0e(r0 dB. What is the intensity level (in dB) at a point 2.0 m from the source? Assume that the source radiates equali4p( box tsrpi) 80-iely 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 df9nq pvx/ij *3g )h2ysB. At what distance willh gn2*/ pyvjx if)q93s 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 fg c /ku pe3m.n82k9xqqc/n( ucrequency of the fourtu9/8c ekc3g.cu knqp( mq/2nxh 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 m,+*wwti7x jwopen pipe is 900 Hz. What is the length of the *x,+wj w7mitw 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 400 Hz8i. a0n ikxtky cj,igo yyxf**45;h/h. What is the frequency of the8i,54t;hcyi a/kg x**0f. noy yikjxh 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 mxsf *z6/ ohf:has a length of 0.80 m. If the velocity of sound in air is 340 m/s, wh /o:fhxm sz6f*at 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 is in a room where the temperature ipumt 3g)te83s s $20 \; ^{\circ}C$. 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 en8o6: j1hbzx3i;b 63cmy .7zgzexaufad is 330 Hz. What is the frequency of the third harmogaa.fy hc661jez u8mo;b:7 bz 33zixxnic?

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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 endl-+:zz(/nw c bjgwpr) that will have a fundamrw):/(b-+ l zncpgwjzental frequency 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 r*+8rk3ba,ny:v1bmwmd d 5 wveoom 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 room where the temperature zd: m zhk 84.ix+w4bru7ns:oz 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 isz :i2utrjd/-g+u) ozj 340 m/s. What is the fundamental freqt-uij):zou / +gj2 rdzuency?

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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 opig h(ey0 i ifkh8fb259en and the other is closed on one end. If the fundamental frequency of the open pipe is 300 Hz, what is the fundamental frequency of ( fe2 fhi8h 9kgiy05ibthe 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 nnl-g cwqz-z7f 6p ,i o*ent-:h;da(z 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 inwe-z,l pch (di-;6ntag7n qfz-oz:n * 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 placedqh*m +rxdcp(.:vvwfr d1u,3 g side by side and driven by the same frequency of 500 Hz. If the distance from a person to one speaker is 5.00 m and the pvdd3.r*,v(hr xwp1cq:gufm+ erson 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 ise33fol0h )c ;grcafde;o96jmiv u 5r- 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 frequency of a m0odg.ig+nhmg oo q-8 *tl,*siusical instrument. If the tuner hears a beat frequency of 2oglq0 h-iig,mogt +s.d8*o* n 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 by two horns are 6 m and 7 m resqrktdg;2 6sg dm3t -0ipectively. What beat frequency is heard when the horns are sounded on a day when the velocity of sound is 340 t3k0qtsi;rm2 -g6 gdd 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 vv bke4 krj*qfcghfk h.-+m, /0l h1g9diolins in an orchestra are found to produce a bea 9/r1 4d fh0j,f+vcghl-gek*m h.qkb kt 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 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 100m /cd2s24ja tq*v m:im0-Hz sound source at twice the speed of sound. Ti/q4vm j *2mas2ctd:m he observer 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 misb8zr.7/vf k ge 1g,,uk 0a/1ruiw :v-dfetof 1000 Hz) approaches a stationary observer at one-half the speed ,- iz1te ge0 vfru 8/7rd vgwisk/bumf:1.,k aof 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 bjs64m fg0 b-ma listener moves with a speed of 30 m/s away from the source,ms bbmf46-0g j 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 traveling at 35 m/shy12c1*x(jda pp:3hd; mj ggi 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 themj gp1:hghip1d* (adxcjy 2 ;3 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 statio k* pq2z:u gr2x1:adydnary observer when a train approaches with a speed of 30 m/s. The frequency of the train horn is 600 Hz and the speed qux:p*a dr12d y2gkz: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 400x2bzu-1si;p n-Hz whistle. Take the speed of sound to be 340 m/s. What frequency do you hear?12x upnsb; iz-

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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 stationar0r0 x/eeduva ,y train. The train blows its 400-Hz whistle. Take the speed of sound to be 340 m/s. What frequency doe evdr au,/00x 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 400-Hzts4 gq2qpw8 vt0 x;g4h whistle. Take the speed of sound to be 340 m/s. What frequencyt;40ggvpts2q4 8hxqw 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; tw09u dxesn77m2v4c ;mlpi obm60 tq its whistle, and you hear a tone of 400 Hz. Take the speed of sound to be 340 m/s. What is t0qm u vle40 7 2;wnm6sci xtmo79d;tbphe 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 tr+-vzzp : xsuntn,1ur(ain 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 moving away from the train w+tuzr-(zpn :,nv1xs uith 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. Assum ;r9 ck0 z,oi wgj,n,q+iuwli5e the speed of sound in air is 340 m/s. What is the frequency heard by an obsniwk0;9lj,u5zw + ,irgo ,qicerver 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 ano3,bfwh+ ,w*wop t n*m object. A 40-kHz signal is sent out, and a 42-kHz signal is returned. Assume the speed of souh,mo ,3p *t*nww+obfw nd 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 supersonic aircraft;o0izjmhl)5qc hf 14e 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 Ma 8t9vbg:xu9io 4lhl(rreq/wdo r:p1*ch 1.4. What is the half-angle of the conical shock wave formeogxrrh(vu: *li 1bqo :dpt9 4l/9 rw8ed?

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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 fro ok/h9n,ol :yyvj4f 0om the United States to Europe with a Mach number of 1.0j koo9y0yfh/nvl, :4 o5 where the air temperature is $5.0 \; ^{\circ}C$. What is the speed of the plane?

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