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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 falqijq g412c az1xkp:7 hse 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 c :am;m *fg6zlxx-/7 ugxepib 1onducted 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 sound in a ;wb1f 5ftr th8pj ew5;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 the velocity of sair59r 4qqe, uur 1m4eound? (Assume that all other fac, m1ra9q4er 4uuire5qtors 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 400x winbj 4xo4;v cga)-- Hz sound, the velocity of a 200 Hz sound through aiw- vb-jog4ix cna ;)x4r 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 wavelen n6+ wspgjpv;5gth of a 400 Hz sound, the wavelength of a 200 Hz sound in air isgn+sp;6jw5v p

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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 call j ew)a7sfwz8ggp08+wed

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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 lz5rg10eik g ,fess 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 emitting waves uniformly in all direue5cs2j,k 2 6 /ios o5ir0qpvtctions. If you move to a poin0iq kpsscir2,o5 j v6/2 u5teot 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, inz,cqlwlw, sk:uf 2b*s.) p(2l)jdggptensity 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. What is mbv3y(9+t zl wthe intensity at a distance 2db (y 9lv+mw3tz 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 soursqp ;r-6k wj(zce that is radiating equally in all directions. What happens tzk(s; -r jwq6po 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 svd cci.v7 ewe;aiq16t1 ( 7puaource that is radiating equally in all diu 1c;ca ee 17 wpv76ia(.vtidqrections. 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 sound beco2 2vdfrcm*6 *3eouz;brp:etxq fc v*7mes 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 speakerokgy 39ip( y8h emitting a pure tone. What characteristic of the sound increg 9(yokh 8pyi3ases?

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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 no,h zxk(, d6jz.a qy-rre3/ko ite?

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17#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What determines the "pil,yh0v -xr 4w*u qgvw*tch" 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 )trv/z2l+wh x.wori* m vlpk5fy i;68air 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 ars r/nlnk+2(.yhzz9y he

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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 and z0j ( w1m (d6a6xwhxtxr xgg9,the sound wave generated by th6z0g(m6(1 a xw g tj9xhrxw,dxe guitar as a result of this vibration. 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 op/3:az(digs9 b,seui)woz+ pven 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. qb-c0* (rlzqwqvndt+j)8h; x What are the wavelengths of the three lowest tones prt;wz0bvqx )nc+jq( *ldq 8h-roduced 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 l+nnv 8o,rsp , vzy6(jbength L is 200 Hz. Which one of the following frequencies will not resonate ivynpb(+vj,6 oz 8,sn rn 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 fundamental frequency. Which yapzfngy5 (+jf.2 y y5f8hu: wstatement:w yhy+( j5g5y yafufzf8pn.2 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 which is open at one end and closed,xkr ,sa8/ib b 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 2)i:3z k: +mbvtok (n w2tmwklof length L. What are the wavelengths of the three lowest tones produced by this pipe?:(tkmmk kbwv 3i:on22l+) twz

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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. Which of thp;tf89 og *sxmpia 4-te following frequencies will not resonag*t-sfta8 o p;mpx4i 9te 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 py;bg 56fpwdcbi/j9e5sad1 1w92f5 r3plxxdone end is resonating at its fundamental frequency. Which state1idwfp/ 55l6p9g31prxd b x;y cs e29afw jd5bment 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 z +di yqi-uop76 7fjh .xpo/3hthe same source. Each speaker produces a tone with a frequency of 200 Hz on a day when the speed of sound is 330ho7.6qjx+zp id7-ph fu3/oyi 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 wav:skwte ps2l/4e* 1uk y*az o3fes 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 particular beat frequency is 6iz(*wf q0 *otvyy7 eeheard. What happens to the beat frequency if the frequency of o6f*yio w0t7q* z( eeyvne 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 expls1jgj9v)ys dq xz .ef*n7;- olains

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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 4otpfjzcado4 5c(le w )ha59b5rap .,observer. The frequency heard by the observer isp4c5 abal,p.() r9 e54aw dozt jh5fco

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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 frequenc 2qdve i*mhapo o /:qyfp46-3qy heard by the ooq*vod/ 2m-fiey qa6qpp h: 43bserver 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 wil,v(yj rrz0r5r m;sn8z 8;q : cjneqvg6l decrease by a fa;5 0vjm q ,j8rne(6ns8vqgyr:rzz; rcctor 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 inao wr9poc)q /3b(rl,s)bkqs 1 xy*n v1 air is 352 m/s. What is q1krxyb(v)naw9oq,c1p r3*)lbs /o sthe 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 soundr-8r*(:e wsgldy z7qp 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 iqp2-x kyfoi5u)x1chl 0xvj 89 n air is 340 m/s, a bat emits a shriek whose echo reaches it 0.0250 s later. How far away was the object that reflxhx5x j-9y ql)1vp0ifu2ko c8ected 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)/9rs 8xfl+ o+kwynou . 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 ) dac :a-p +d+nf/b* /efuclhgdistance to the :u -f/+c d+elhgna/f)*cpd balightning 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*a ub pu.u2/r9x-bsu :8xobdz the temperature 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 latersnwg77y h7zl9xjt4: q. How deep is the well? (Ignore air re77gs q4n97wtx yz lj:hsistance, 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 fr1g/nt0yrxp3nh4 , zhaequency 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 aim)7bdwn*cv3(b8*s ihb )bqbl, r9 vce r 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 a sound y: d1jxh(0p;4qj f nn1 ol9qtiwith 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 70-de+i (bas8e)a(zc d;t lB 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 witefq3a 0q3 u *hy-eaz.oh intensity levels of 70 dB z aeqauq3 of.he0*-y3and 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. What1 ftoew( qh: b ddp6mvb,-.lt3 is the intensity level tb 3,f dtl(o:.dw p-v6eh1m bqgenerated 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 frob*bry,wz(:o xm a source that is radiating equally in brzwy*( o: ,bxall 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 distanelih)5e*ol46:mpif+- qahvu ce of 6.0 m from a source that is radiating equally in all lal ifu*-4)mpq+io veh6 h e5: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 about 1 mW of power, which is asu*gez g*baa-8 2xvd *lsumed to be uniformly distributed in all directions. What is the intagl dug**-2z 8xebav*ensity 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 barywk+qu 48n8 pa .9ykcwking dog. What would be the intensity level if two identical dogs very close to each other are bark+yn8 9q.py cauwkk84 wing?

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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 m0 +t( 2hv7jowshlq8cx from a sound source the intensity level is 60 dB. What is the intensity level (in dB) at a point 2.0 m from thh v(0o7tj82 hxsw lcq+e 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 5-uq(tv y3eo9 flksv3 point source is 95 dB. At what distance will t59vqu3 ylkvf-o3se( 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 avlbhf ,o7h3u( frequency of 1200 Hz. What is the frequency of(l fo7 h,ub3hv the 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 thiy6nai* p go/d;- 2hrqnw 7pui;rd harmonic of an open pipe is 900 Hz. What is the length of thpinq6w7uyoa/hirg 2*-;n; dp e 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 vduse96ait p urgxis :7 s8k/l3z260t 400 Hz. What is the frequency of the lowest tone that will resonate is7 36 u0rvu:/x6gzlssit8a 9iet pk 2dn 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 m. If the velocity of qt.dz26,r2 *o f be4hm n;r7t.w bqkhdsound in w*bd4d .fqqrt zn.e 2k,o;6 hhrbtm72air is 340 m/s, what 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 +pqvk(nfkg( y,ha9f snel.1* 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 pi x7e,a-y 7r via9pp c35gjs1(yrsc:qdpe closed at one end is 330 Hz. What is the freqcx,sypiera37p y a sqd5( v-j79g1r:cuency of the third harmonic?

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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 shortktn- jl0 *apg)est pipe closed on one end that will have a fundamental frequency of 60 Hz on a day when the velocity of sound is l pnk-jtg*)a0340 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 whxi )0cen8do v57h1i9nwks8fb7v :bad ere 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 tempera s-yk(zmcv ,ck.ods.3 ture 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 plaskv u(8t nnf ,)z2 svtx+/xx:oyed when the speed of sound in air is 340 m/s. What is the fund,x oxtn: fv (uv)nx+st/2skz 8amental 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 thrxbv ;+czeu73 s/w2 d2 ccr:kpe other is closed on one end. If the fundamental frequzk/ 2v:3 sw+ccr rc27;pdxe ubency 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 frequency of c8 v,myw tovlqg;v16wj2k /;u800 Hz in air where the velocity of sound is 340 m/s. How much farther back would source 1 have to be moved so ,c jw2gmqv;yvult k8 w/; v6o1an 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 bx/)p* ,ox1zo/ynu dd 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 person detects little 1* /x n,dudzy)bop/ox 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 the beat;ttbq*g0f uhu7+gki; 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 freque*;sra+ q+ yn6 gdgh-vt1vo wk cf*1p3incy of a musical instrument. If the tuner hears a beat frequency of 2 Hz, what is the frequency of thef3iwh1ksgro1+6a nyd+ vg*-qc*t; vp 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 r4ao s:40x93tkumivagi0b( ksespectively. What beat frequency is heard when the horns are sounded on a day when the velocity of sound is 3at(bou:v0 ss0k g mi944kix a340 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 psx z247bi7byviolins 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 the same frequen72 zbpx 47biyscy?

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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 stationaryf1 ye+:s6n2;6qzxfmqj qcy 7-.in xhm 1000-Hz sound source at twice the speed of sound. The observer hears a frs21+q:; 7.nyfmj6 m -h6ezqxyqxfi ncequency 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) apprvari yl-- l 61o7vcvu5oaches a stationary observer at one-half the speed of sound. The observer hears a vl-rc57u-16l oviyav 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 1)oa pw.fgqzih*4uo 1-000 Hz. If a listener moves with a speed of 30 m/s away from the source, what is the frequency hear -qo41).owhiazgp uf *d 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/s*b)j); ggzj yt8gv 2 rq2lz.co 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)zyb *;qt o.cgl)gg2zj8j2r v 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 by2 0vc zymf:qo; a stationary observer when a train approaches with a speed of 30 m/s. The freque :o0q;c 2fmyzvncy 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 b7rfctax5zr f )bq(+ffj 3g 2q5lows its 400-Hz whistle. Take the speed of sound to be 340 m/s. What frequency do you hearf j(t gf qr35czx7a5q +bf2fr)?

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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 train blot+qp 5+m zaf/lws its 400-Hz whistle. Take the speed of s5a+t+ m/pzlqf ound 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 a*kyktlmt7c:rg ;92 b,yx+gdw (tx ,xm way from you at 120 km/h. The train blows its 400-Hz whistle. Take the speed of sound to be 3ykgm :g t7b;x tt 2mr(dlw*x9kx,yc,+ 40 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 : jjn6u ysdwu;7lb)d(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;by dj76n:ud (wujs) l/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 of sound in air is r:7gko*;jjo w340 m/s. What is the frequency heard by an observer if the observer is moving away from the train with a speed of o;gjo: kj r*w730.0 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 hi-j u s/dn5ep/hl4.ol orn 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 approaching the hpil5/s.de-4u on/j ltrain 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 speedjz1sk, :fm;pu:kr9q u of an object. A 40-kHz signal is sent out, and a 42-kHz signal is returned. Assume the speedr,mpzu::k; 1fkj 9qsu of sound 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 conic8*zav-dgbje lh2/1ktu 6l7 alal shock wave produced by 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 the half-angle of the conical shocss h g; h69t+lc8i tbt(i7;qvik wave forgtb6slv7+ 89;c;ti i(tiqhs hmed?

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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 fr/dln u .o/4zglom the United States to Europe with a Mach number of . gllo/d4uz /n1.05 where the air temperature is $5.0 \; ^{\circ}C$. What is the speed of the plane?

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