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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 94j oond(t+x,yblq5 qement?

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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 tm84q)f u*p,sulba3 i conducted 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 steel rod?7xij+l7w+h lw n 9 ddbk0p0a9v

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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 velocicfd5p*d6a *r wqzbc.l pa5q8huiu.b.- +lod9 ty of sound? (Assume to-qcql. cb9b*a68z*.d i u+u5aw frplh dpd.5hat 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 sounmi/3/xqrg/0syxx w 6lt fhp 3+d through a/tlr+qs 3g/y0 pfxhx/w6ix3mir 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 so8g97p6n ixb d ff f7u+49sbttnund in ai78f9 nutf dbi+tnb7f xps6g94 r 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 Hx7 )p)x.o r; fzabyik,cxo2s 4z 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.xw srv ,f0t(s66 fwk(ag; xke 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 uniformly in all directions. ug -n4x6 hq4o0,mubts If you move to a point twice as far away from the source, the n044 us6mtg,xh oqbu -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 ,*rwn92n b x) 1gf5dsuj6i: tn(gjyzu waves, intensity 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 sourgy oy18 ,mt)+dea (zrece is I. What is the intensity at a distance 2d from the sourcee y ,e1+tzy8a (g)drom?

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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 radiatqwug25rh-7s7kd j* pding equally in all directions. What happens to the intensity of the sound? It puq-5dhdr2ks7j7*wgreduces 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 that9y/)nwzq,xf dw v-*83fejvoj is radiating equally in all directions. What happens to the intensity w) /*9 jfjx,8fd-yz nv3e ovwqlevel 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 louder? ,(8v (tsu:mq. xnv0n2fdvrkd

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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 (6aho2 +o vxlungyh9gup ata/6x 7:1xa pure tone. What characteristic of the sog6hay:txu1 xo9gaxaovl/u h6 +p72 ( nund increases?

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16#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What determines "loudneds5ur qzrr3f ;o8v2g-ss" 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 2 i0hn/y:,ds9 ymwos oyw*u)y"pitch" 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 ai9y7dcee4y, ov18c hqkoi48m gr 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 waves5klm/m wwln+z pf 5 +k. kte1)+ax3iuj 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 and av.tne p( 3mc486am,vqc quh4the sound wave generated by the guitar as a result of this vibqmtv3,ahcu 4q a.c48nvp 6em (ration. 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 w *fh5cn r-lqx,x,hu*ehich is open 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.q h,8o7a-35wfjbtye a What are the wavelengths of the three lowest tones produced by tbfy5qw 83ot-h7a aj,ehis 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. Which one oxs 8;p+p:ufz qr12pmjda ou0f0h ; vo06x5daff the following frequencies will not resonate in the same pipjaar0 0oph; d16u p5omfz qx2;x: sp0+8fvdfue?

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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 leng.ei6lic(gi f /th L is resonating at its fundamental frequency. Which statemcgf /ii (l.6ieent 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 eeso.; + dox;c:0janbyujw g ..nd 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 leaj(z)e3 f:0r rlrm4xd ngth L. What are the wavelengths of the three lowest tones le)3rj zr(dfxm:40raproduced by 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 resonate in a closed pipe of length L is 200 Hz. e0sx ayswd5wd0w 0t:,Which of the d05d ewy:,w0s0tsxw a following 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 resonating at its fundamental fr*r3/gm)j kr,ztuhb2 o v t1sf7equency. Whivg h72tsr otj*fbur 3z),/m1 kch statement 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 spea q awsrioa(u11*9s/ mjker produces a tone with a frequeiq a/sja91suo w(rm1* ncy of 200 Hz on a day when the 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, the two sound wavnk0) 1hu1t6xdna rag)9 q.eares 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 frequeds2lofy / o5k )fji (6s3zkzg7ncy is heard. What happens to the beat frequency if the frequency of ozs zs g(ydf6l32j57)o/ f kokine 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 explainsm/sac5.ekv 5 jzni- ( g(hxiw:

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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 the oic4(b wgq: g(cmglh4 aljctx s4;50c9bseqg(jt9cg(sl i45c :c4cmaxbl h4; wg0rver 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 observdz /et8fh 8n+wqb27 m-td3ieuer. The frequency heard by the obsez e-dbqt2 +38 d7wuhi8/mfnterver 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,qyd d-.*qkdl* its half-angle will decrease by a fa**ld qd-.dy qkctor 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 soundxfom eypg ;4pvn3 8ptb8)7zy3 of frequency 45 kHz in air is 352 m/s. What is the ai o vy88pxn4byg;ze)37pm3 fptr 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 tc(zet,: *vwi:o ( eui 1wmuqmh)4 ,5tlfb j.sqhe speed of sound 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,jrfvb5p 8eu 58qo7d )g a bat emits a shriek whose echo reaches it 0)g8u8pqr b7edfv5o j5 .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 : hs,etc51qh ls. 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, qj 3 j(8sx) ezwty6na(the distance to the za6wyq3e(j n8s t() xjlightning 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 fromj(z-cul 3gp;f: zc*u h 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 the splash 2.5 s 0alad5f +.ytflater. How deep is the well? t+ f0ldyaaf. 5(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 frequvxvf3,g k 8lyio-zq+ *ency 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 p66vzyk8wkf + 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 with intensi/fhk( esqen2c d a.tf 9xx/;/wwjj1 r5ty $10^{-3} \; W/m^{2}$?

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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-d4/g ewom b050b(olihdf5depplq (.h4 B 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 wxtj632ppk x f0qj1cu)z tljrb4* zo s+w7*p0zith intensity levels of 70 dB ax bs6*wjzqo3t pc ju2z0 pxj1+*lz4)t7frkp 0nd 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 i.d v 3cxh kn.uujh4)b qkvx91*ntensity levelu hn j1 cvx)v3b. x*4u.hd9kqk 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 source that is8w 8uvo mv )k .aw*1dh.jovl6y radiating equally in all directionsv.6 1wyhjko.) 8mu* adl ow8vv 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 8fw7g i4tqe*fof 6.0 m from a source that is radiating equally in all di*qet 8 ifw4gf7rections 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, which59tq/z ( mzqlm is assumed to be uniformly distributed in all direcl(q mzm q/t59ztions. 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 distance 5.bp)xdzry f8-t:(m 83.vf h6dbq5mud e00 m from a barking dog. What would be the intensity level if two identical dogs very close to each other q5m:x6dth b -vbm 8( )ff. dzre3uyd8pare 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 60 dB. m*am2dt; i8fb o0l1lsm +nc+g What is clo +t8*abd n1lg;20msi+f mmthe intensity level (in dB) at a point 2.0 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.o:9 ; sv9tpnyk0 m from a point source is 95 dB. At what distance will it bps;vkyo 9t9: ne 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 hash:d7xlucw q()f0ns/ x a frequency of 1200 Hz. What is the frequency of t(uqcd :n/x)7f xw0lsh he 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 open pipe is 900 Hz.2 k,-db5 e xkto4srfn9 What is the length of the pip4ksr dn5ftbk o -9,ex2e?

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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 opefaxgya))2iiuy/ tl/ ) n pipe of length L is 400 Hz. What is the frequency of the lowest tone that will resonate iytagf) )/uyia /l)xi 2n 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 fr8xfcw, 9:m flength of 0.80 m. If the velocity of sound in air is 340 m/s, what ifr:cf 98 xmw,fs 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 iil2y)y.7 ccb6u lxdd,bv d ,2os 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. What is thn+s /lgc(jrwoa 4r :7)s.rh-ah1;losk a6xl ke frequency of the third harmonicsxhr(g-l:1kwjr/a+r kcn sl;o.6la) ho7s4 a?

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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 end that will have a fung.oofaxk 9o:-x p/fp,damental frequency of 60 Hz on a d9 xkox.gf:-paoo /fp,ay 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 l,f 3h hgz:ht;b1ky:o 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 roorc)t 5x ploc21m 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 when the speed of sound in air5heqgw; hz *jbo :y5k: is 340 m/s. What is the fundame;: z5:ogyjbkeqw 5h h*ntal 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 ah)bhofp1 q; 5jnd the other is closed on one end. If the fundamental frequency of the open pipe is 300 Hz, what is the fundamental frequency of the closed piphb1p j)fo;5q he?

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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 emhl9 7-2fmmaq 9xvdwl;it a frequency of 800 Hz in air where the velocity of sound is 340 m/s. How much farther ba; l -mahx72fwvmd 9q9lck 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 side and 8q0 *ejz62zx7rxuehvjgez86fk . 5p pdriven 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 or no sound, which of the following is a possible the distance from the person t 6u.028fh zpz7 pjqxg v6rek5xe*8ejzo 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 44n 5visgahgtiq/6 0trsgp)2-(en 0z u34 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 to tune the frequency of )z4jn qs0sz2fakpo: 9a musical instrument. If the tuner hears a beat frequency of 2 Hz, what isz:q)20 n 4 o9zfjpsska 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 a5q*3cujztcy /y.2f gjnd 7 m respectively. What beat frequency is heard when the hoc/3 2zy*f gjuct5 yjq.rns are sounded on a 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 vj( c hd;,azp+diolins 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 wo+cj(pz hda d,;uld 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 1000-3;ko:+a*iuvczej ac ts,a8r.bp,r3k Hz sound source at twice the speed of sound. The observer hears a frequen; ajt3v.e,rp8z:ck aa3+ srbic,*ku o cy 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 a stationary obsevp)9 kb8jjqy 5: f6czprver atz 85:vp)fqbjk9 ycjp6 one-half the 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 1000 Hz. If a listener m m:u mep)iwp4p8r(6 jdtj )bm4oves with a speed of 30 m/s away from the source, what is the frequency heard by r)(pmj j m:ium8d4p) 6 4tepbwthe 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 dayhl fq4g*nv2i* when the speed of sound through air is 340 m/s. The car approaches and4nqfl h* *ivg2 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 8 )fbblv3rv51b; cliz heard by a stationary observer when a train approaches with a speev1fbbl5 ;izr c83b) lvd of 30 m/s. The frequency 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/hopm ) ;ndtbq-e;lw+ ;hlh ,9mh. The train blows its 400-Hz whistle. Take the speed of sound to be 340 m/s. dl),q;l;eh+9; m hm -nob htpw 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 stationar- tall*jx00udzz/ n2mpkg d /:y train. The train blows its 400-Hz whistle. Take the speed of sound to be 340 m/s. What u x2j- k0*tdgn/0dmzl:p/azlfrequency 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 youlpa -ol,,a *rq at 120 km/h. The train blows its 400-Hz whistle. -aq o,l,*par l Take the speed of 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 blo tt.p ,ife9t,o9wh(vxws its whistle, and you hear a toottp xfv9( , wei.th,9ne of 400 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 sound in air+lzj6q rh+r+o xjp/;e+ f7xcf 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 pj+rhlr cz+7++6foj/;q e xfx/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 a 8yrrr )+ r,ej;dr)kospeed of sound in air is 340 mr )rre rd8+yj,o;k ar)/s. What is the frequency heard by an observer 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 detg ukaq45i f5j.by9 /vuermine the speed of an object. A 40-kHz signal is sent out, and a 42-kHz signal is returned. Assume the speed of sound is 345 m/s. How fast is the object /vg9abku i4.5f uy5jqmoving?

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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 d9zjyzcdb7f( j(j6 qw1jzkv;w : h7g4shock 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-anglwco9y8ii78kl qwv(m/ 9 n yr2jx+b5wz e of the conical shock wave formed?xw 9ww(/ kv8 y n9lqyiozm85cr7j2 +bi

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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 with a Mach urrej6n-, x)lnumber of 1.05 w-ner r)lx,6ju here the air temperature is $5.0 \; ^{\circ}C$. What is the speed of the plane?

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