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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 false stat y+bthosh nl:(-31t6 b 4wyrzuement?

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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 6zva o;i/mxr ,276io j3medlpconducted 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 soun3kkl3(.gk0wt ah 6 hwgd 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 the velocity of soa8ax-0 w;n1bvt 4 ivotund? (Assume that all other factors remain cotv8-wa0t4n axi; 1vbonstant.)

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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 H1*;hgwakm(f ensc2 5s z sound, the velocity of a 200 Hz sound through 1 5w2;* cmgfshsn ka(eair 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 sou*tm0ejh 4e4 dqnd in air i*4j40de ehqmts

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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 t nu1 hsz7,/kau*a.aoghan 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 fp d(kfrggtw:q;755b96 wjpn stke2 - j,)d xiirequency less 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 ufhm 7zuq/0v r9niformly in all directions. If you move to a point twice as far away from the source, the frequency of the sound wru7zf0/ hqv 9mill 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 p0f1cvb by *zfpu--e5jroportional 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 sourceffa14:0qv mqb:k. f-rq1mm ij at a distance d from the source is I. What is the intensity at a distance 21:.aq -qjm m4fi10 qkbf:vfmrd 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 distansal dzdc)xx-og3 u j,::,ghoici : +v/ce from a sound source that is radiating equally in all directions. Whag -i/s dhgva o :3coxl:+x):ji,,dz uct 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 from a sound source that is radiating equally in awou4v z kim/xy-s t13+ll directions. What happens to the intensity level ofu1-m4 w/ iovx+k tsz3y 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 l6jtj ) 7dhwy+sd 34nivouder?

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15#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  You move slowly towa . e3k *omwftv9)tq;dhrd a speaker emitting a pure tone. What characteristic of the sound in .kof9m; ett 3v*dq)hwcreases?

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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 musi 49cc.s .m yz5qp 7skvsy94idkcal 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 nogw9nd f+rz0 qjrq *)p,te?

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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 air into wak k kbb;0ua2zn-,kq,e ter

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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 aetl23 1jbc*5 +ylq (jsrjrs ,3u5tev jre

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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 the sound wave generated by t,.os tu 4rpeh n77vawa(f49eehe guitar as a result of this vibration. What do these tpo449,er7(ha t uevnafw.7 eswo 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 aeyry gs6 d6(aq1zjq:3ia9c 1ft 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 o 7jox1hov w;12d w (v6fj7au7zx.tziw f length L. What are the wavelengths of the three lowest tones prod( t26 7vw;w wx1ofo17izu7ahj .zvjxduced 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 ofx* . 3tlkhzf 2u1spt9c length L is 200 Hz. Which one of the following frequencies will ntc1p *9 uftzsk3hl2 .xot 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 lenght;-1(amsrs/ x hwwn.th L is resonating at its fundamental frequency. Which stath .;wts/w(-mhsax 1nr ement 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 at ta 6iqq0 *:xsbyhe 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. Wp8tv9pufmd+7 b o s;w;hat are the wavelengths of the three lowest tones produced by tt8v9 pu;d 7ms wof+p;bhis 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 l5jbf +qs.mnpl jdv.d6x6x f-8ength L is 200 Hz. Which of the following frequencies will not resonate in bdv8j xmjql-f +xpn .f.6sd65that 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 fundamenta.ryz zb:iu 9n(opmo75ej;at+ l frequency. Which statement is correct?oiya( o:;bp59t 7e+.jz um nrz

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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 tt46ub 8l .i c(roysx8vwo speakers driven by the same source. Each speaker produces a tone with a frequency of 200 Hz on a day when the speed of sound isoc l886bv .4i yxrt(us 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 ,pstii8 l p./2fm;i tnsound 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 and a particular beat frequency is zef3 pwn hir2r+*j:j e5lb/8theard. What happens to f*jrbi+l ew/ne8 2:ht3 zj5rpthe beat frequency 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 explains11lv 1 0pa 9ufhfes)ja

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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 frequency heard by th)s89p(ic dqzoeeo i vn1/ ,3pbe observo (3vbe)/e9d,1csp izp8qoni er 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 aqn. m (wako:s7d3wg fxq4 5c;observer. The frequency heard by the obser3c ;kw ag7o(qan:qf 5 .wx4msdver 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 h 7a.he fih(y,valf-angle will decrease by a factor ofyfheai( h.7 ,v:

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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 -h .khqe 0ojxv0 +qnvde(cs /7air is 352 m/s. What is the air0n(h0qs/eev-+ .kxdq7voc hj 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 ahit:k v/:l- mmt $0 \; ^{\circ}C$ 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/m4 sf)1kua/0 *e*r( .9r tqhkdehlvx qs, a bat emits a shriek whose echo reaches it 0.0250 s later. How far away was the object thak/1em 0fh.ltve*q sd)xar4rq(*kuh9 t 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. Th a/ zv9y( ,3mgokxacs6e 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 svjx2 t(hie242o;ewrie0p4x ( yp(rml w0h 9apeeing a flash of lightning, the distance to the lightn94 ylh2x0ojiwve rhm pit(ex4;a rp0w(p2(2 eing 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 yv x)a-weo(n*c(ip4 ps from a cliff on a day 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 s2*prwy imy3s g;dq5.the splash 2.5 s later. How deep is thiyw3gq5 .p*mds ;y2rse well? (Ignore air resistance, 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 freqmm 5z9efdb +e xz91um7uency 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*kxu)e 8cf g:,uuk19dh2bm tsjzr g.7 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 zxvfrj xq bi9l97 5e -85xh)svlevel 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 intensity of a 70-dnc(2 gb2f*5;pgef o sdB 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 sounyq(6 ylm j1w.pv6u. flds with intensity levels of 70 dBlvp6 ly(6w.1j. q myfu 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. Whuz ujuh,53 24br-lfutat is the intensity lhu2 ubtf j,u3 -z45urlevel generated 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 sourcey3xkh;d :m evk2a+ r6j that is radiating equally in all directions is63hv: j+km;e 2 xaykrd
$6.0 \times 10^{-10} \; W/m^{2}$. 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 sourp0l)qt ((koo 249gylhoolpo( ce that is radiating equally in all direc o l 4l29(op0okgq(o p)(hoylttions 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 anmbtxs:.s83: mc0 o, p kgw.lassumed to be uniformly distributed in all directions. What is the intensity level at a distance 5.00 m f:n as, :gx8 wp3tk obsm.0.cmlrom 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 kv .d) d*xl sfa.u7cg9dB at a distance 5.00 m from a barking dog. What would be the intensity.fu vg. ckda 7*9)xsdl 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 isi;qr 4,icz4m9t wdqxn)j* v9 m(vmtl: 60 dB. What is the intensity level (in dB) at a point 2.0 m from the source? Assume that the sou9q : mtnm9xr i )4zv4v*lq(cm,ti;dwjrce 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 sourceu)m; iuu:f,nm,j q p,a is 95 dB. At what distance will it be 75 dB,: ,,)munmpa u iq;juf?

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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 compcfh0b q)zp4s-zb+c1 k9l( smglex tone has a frequency of 1200 Hz. What is the frequency of the fourth harm 9zfzh0sb4sq kc()1lc-bg+ pmonic?

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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 Hzix (, kgazuv0:. What is the length ofax,zgv i(0ku: 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 an open pipe of length L is 400 lz3x g8 ko40gmHz. What is the frequency of the lowest tone that will resonate in an open pipe of length 2L43x l8mkg0gz o?

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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 pa tje(w e7pynpd9 547velocity of sound in air is 340 m/s,peywe 7pj4 7d 9a5n(pt 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 in a room wherdqeian1ak ;r619ocp i fb.* t:e 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 on3 en1t ;kkx,eje end is 330 Hz. What is the frequency of thete, ek13;xknj 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 shortest pipe clos 2:- n7w cqiht0rukla4o 2e76 en0vrgjed on one end that will have a fundamental frequencyr 2uwi 7eqt0nvern g07hj 64:kol-ac2 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 room where the temperature iy 4us)w frpw9n1.y7fg s $20 \; ^{\circ}C$. 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 b9gr1yq3a po2 qvlb4t : 5du/22eo exoin a room 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 lengr7gvi 4(ii4 asbrpy9 :gw(t+ith 0.75 m is played when the speed of sound in air is 340 m/s. What is the funda( svy(ii44r +iwbr: 9tpa7iggmental 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 other is j ie;e mg6:a*rclosed on one end. If the fundamental frequency of the open pipe is 300 Hz6g *; :rajieem, 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 800 Hz in air where th2pfzz-+)wn kae 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 s wa2z- )pnfk+zources 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 plac py9tp6kb-a, 9adik1ued side by side and driven by the same frequency of 500 Hz. If the distance from a pb91u6py ,ik dp- kta9aerson 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 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. 6q:w x;kim+ dxkx5f+m 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 to tune the frequency of x:y/u33ad 4 g rgp+7oiy6tk ija musical instrument. If the tuner hears a beat frequency of 2 Hz, what is the frequency :+3grp/37i6j kyu agxd4yi to 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 respgy- huq82yzj3ectively. What beat frequency is heard when the horns are sounded on a day wgz28qy uyh-3 jhen 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 st3fu9i *rb+itl,v(/qexy d* zu rings on two violins in an orchestra are found to produce a beat frequency of 2 Hz when a frequency of 660 Hz is playe ,*(z+ y*lu3ixvrd9/iutqebf d. 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 1000-Hz sound sourcke2 fv8e9ir3jo w 0+vwe at twice the speed of sound. The observer herk9j38fw2vv woi0e + ears 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) as:qhf2-wjyez v( )9 9bfbaxjdd 9z(p-pproaches a stationary observer at one-half the s9hy f9bjx-qz vwdaed-2) j : 9bzsf(p(peed 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 listener moves with a zbny .w ,hkrlwww+,u sn ,35te2p,5hnspeed of 30 m/s away from the source, whatww,r nh,5n2ts, zwuwh e. 5lpk+y,b3n 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 m3dw /se8/1p)mi z6hho a1c:b i*zrfb,)zw k wa/s on a day when the speed of sound through air is 340 m/s. The car approaches and passes an observ,*he/ )arfmzw c 1 i:8zz3ai1bph)/d ow k6swber 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 heb ( bipn/m.l+:kx/olhard by a stationary observer when a train approaches with a speed of 30 m/s. The lb//+o(mibp . nxh:klfrequency 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 towa tx1c2c q/w3imrd you at 120 km/h. The train blows its 400-Hz whistle. Take the speed of somt3c/wc 1 xi2qund to be 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 stationary train. The tr n;*p/sq mb1o hwwt5x2k/q+jiain blows its 400-Hz whotw2;xh+pnws *jm1q/ 5 q k/biistle. Take the speed of sound 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 km/h. The train blows its 400-Hz whi scy;,gni9 cd+stle. Take the speed o 9+;cc s,ydingf 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 from you at 120 km/h. It blows its wh(ngvjv/ 4b wtd/f86 bzistle, and you hear a tone of 4z / /jvdt(fbwgvb8n64 00 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 of sgm d3ubsj.0wufpos : u3 i0/4zound in air is 340 m/s. What is the frequency heard by an obd3s30 m i fu0guz:jw/bsp. u4oserver 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 500 Hz. Assume the speed of sound in air i 6)arq1r 7hnqzq*oe; fs 340 m/s. What is the frequency heard by an obserq;16)renf zh 7*aqor qver 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 thep)+)e b94 k nt+x-temhf+ czvj speed of an object. A 40-kHz signal is sent out, and a 42-kHz signal is returned. Assume tjp)9)xf -+bekm+vt nc4e t h+zhe speed 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 conical shock wave produced by a sup 8k7a89ke lnroygvtwep3 30+ personic 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 gt56gd da.:0w +sxmu6ul (z-ltlq t5jconical shock wave formed5ts d gl0q 6lgzaxu .+u tj:wtl(m-d65?

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87#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The Concord airplane ./yenfvzdw q) f1 8t9-wfzn0tflies from the United States to Europe with a Mach number of 1 ntd.e f9v/wt-y0 nfq8 1z)fwz.05 where the air temperature is $5.0 \; ^{\circ}C$. What is the speed of the plane?

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