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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 fas f:cvz2 umb-. sl5aa*lse 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 thro g9yak(avn.+ eugh

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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 ac .ug9bx: l3mkdg ;s: m;dpr)rgnk p7+ 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 h ,f3cq.s /zswair increases, what happens to the velocity of sound? (Azq sw3. /hcs,fssume that 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 souno qc ;k7jt:vh2d, the velocity of a 200 Hz sound through to:vk7h2j ;qcair 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 5r/fc9 ou 6ss+dm ,obuwavelength of a 200 Hz sound in au /odbsocmr59u f+6 ,sir 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 20,00jeq a-/ag dlo4., axp+0 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 less than 20 Hz are soj cg:y; m,mpn2(h:ng9ogm5called

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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 u/xgtd k( 4qs-dm;jv*ss/: w wfniformly in all directions. If you mwt:jssdm /x-vq*f4/(g wd ; ksove to a 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, intensity is propu9sj;jg /(ax dortional 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. Whatp (8m,1uacgc eys9vc;r y7) ba is the intensity at a distance 2d from the sou(g,8 myreb;y9sa7) 1cu cvpacrce?

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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 a0 hehp u+6qtq co2zv:( sound source that is radiating equally in all directions. Wht ev6ohq+hu2c0 zq(p :at 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 soun x9kj(fvdk-1v a3vl7o d source that is radiating equally in all directions. What happens t3 -vlvxva 1 7k(kdf9joo 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 becomes l8 xcd zz0yw)9p20-o;krunpx touder?

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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 4oc5xo4 yr5yna speaker emitting a pure tone. What characteristic of the sounr 45ycnoy45 oxd increases?

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16#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What determines "loudness" ) dwe6*jospkj :)w3bfof 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 musio7k*95n* cw/y*6k whm zukdtccal 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 air int2c zp; ekts7vb f*a:q+o 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 fen32j0xex 7,wr h,ms; ) xmknwaves 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 a.dy9v, rffvkkvk 3* 5 j,+wg8ofa3b zthe sound wave generated by the guitar as a result of this vivv*9frza,k3 53wf +fa,8kybvogj.dk bration. 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 ends, th az+d0bn8-+(r6 lenzz ,jddqpere

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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. What are the wavelen tk8t7y mrcb183u 9rvygths of the three lowest tones pm38yvt9 rt7urbyck 8 1roduced 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. f)kw*d ( fga dsuu,tb7 (cn760vmxm;hWhich one of the following frequencies will not r6u*m gu d)7m(;kc7d w, af(fh sxbn0vtesonate 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 length L is resonating at its fundamentws0 ;ff p+/+41bdgws6affeh.vnkqj 3 al frequency. Which statement is cor0ffj4 /6wa;hn3 sqfpd+ske.+1gv b wf rect?

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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 the other, tlugt)q2,5 n co;z 1zbjjvg2+ji:(dv 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 wavelengths of tu.a*v1ka itl 4he three lowest tones produced by this pi.1 au i4akv*tlpe?

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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 i,7q ;+pdwmxz+ w4qh8 x3l wva 2-nrezxn a closed pipe of length L is 200 Hz. Which of the following frequencies will not resonate inhr+xqz;q2ww 7np, v3dxz4lw+ea -m8 x 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 f.;0, r 5 tbltfqsvoel ;q7se1iundamental frequency. Which statement vrsesllq0 e;5;f.qi,bt7 1to 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 spehs csd6f0e;)s .w -f+0qjobfeakers driven by the same source. Each speaker produces a ; whco jes0q d6f)0b+.f-ses ftone with a frequency 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 9ve3n 0t4cgo0 *ecwhxtwo sound 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 hek9e95 gb :9smpww t+):iimi.fw* gto qard. What happens to the beatgk5mfis+e9i iwp 9q: w:w.m *gb)9t ot 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 expl3:p(oma- sgwaains

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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 stab2- ,bxzt f,getionary observer. The frequency heard by the observer x 2 f,-ebbtzg,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 stati l,t1c+fshex( pxi-5 honary observer. The frequency heard by the observeri(cs hl5p-1extf+x ,h 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 douw.u x v,m.k6ltble its MACH-speed, its half-angle will decrease by a .m6, ukt v.wlxfactor 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 in air is 352;a eiv q v;g-:/jq2rmb m/s. What is -vir;/ ; qaqgbev m:2jthe 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 so 4b5. ytullhm f60qr7rh1 /( jbgg oevjj-(cl2und 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 bsjvo+4k bf k:* lp/p(qat emits a shriek whose echo reaches it 0.0250 s v/*k pqkoslpf(4+ jb: 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 s. Theca-(9qxfh:i q )ax3t r 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 s0(sdw7o4 ( ghcmd3dfi eeing a flash of lightning, the distance to the lightning strike is abou73 cmd(4if s(dodgh0w t

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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 dajud59 xr (hi*zrddw6. z0uh0jy 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 later. How deep is0 0 s(( iviuikfdzdmgtt;i,6) the we)i ;i(fk tvs 0mud6iz(0gi,dt ll? (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 aiwex 5u3,l7r3:og bre:c yd.tla:x 3xbr 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 aini8ka o/ /fljgn ,pt,157h: krkipx a1r 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 so.ti+2q6u z 0wsz+y wltund 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-dB sound?my ryea63 1;su sw,e7v6dpo)b

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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 .s:as:y68 wdz1i 9d7jmlgni2w1tp( ;spq by j70 dB and 40 dyss ;1z s: 8y:i2d1bltjamw gqj9w (6pn.7 idpB?

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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 er,00lj 1usb8ny2ok0 6k/ sobhb jl0w intensity level gen2 seu 0j 1 nbyso600k8h,lw/ obkrjbl0erated 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 rad 6 rbn b3rlh8*(vydu2liating equally in all dbr* hydllb63n2u8rv (irections 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 icg-,m)o gke* bvo/ zs-s radiating equally in all directionsgo gbo *mc/-,sevk z)- 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 aboussgc l1m3 7t-(8s rslet 1 mW of power, which is assumed to be uniformly distributed in a8sscmlgs t 7sl(r- 1e3ll 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 is 65 dB at a distance 5.00 m from a barking dog. What wow ph:)s8t,v wmuld be the intensity level if two identical dogs very close to each other ar8ww :m,p htv)se 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 bfnt4oonwsf6 -q( 4 w+source the intensity level is 60 dB. What is the intensity level (in dB) at a point 2.0 m from the sour4+n4os6wowf bt(fn -qce? 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 pn00 oc+ki6 ,q 97/,kr ajqoj*oafaz wooint source is 95 dB. At what distance wilo, oqkno 0 , fzi6ja+97rkjqa*oa/c0wl 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. /cc6x w.d6qm3 -1n jgws pajh ve))aw1 What is the frqj)daw6 vhx1- 3jn wgw p6 ./escam1c)equency of 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 third harmonic of an opi3onr:r a(6 cfen pipe is 900 Hz. What is the length of therrno 6fci (a:3 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 Hz. What is 8xmejh6of y:(8x/ en/u eduzth-6)tfthe frequency of the lowest tone that will resonate in an open pipe ot )(8:6 n -hex6f8z/eo/te xmfjudhuyf 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 7xh4;y ;guq.alua nd3m. If the velocity of sound duh;l; uygnq4ax.7a3 in air 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 in a room where the temperature iud4f)c k-3ni ks $20 \; ^{\circ}C$. 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 pip gc;apx * n1-b.gi-fwse closed at one end is 330 Hz. What is the frequency of the third harmonic;was1.*xgpfg -- nbic?

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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 th2l9 q*s aqj4nuat will have a fundamental frequency of 60 Hz 2nj*4qa9ql s uon 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 temperatur5m, x)kl/v okqs rq.m:e 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 temperf: xgib0nkx/s9pr 0p(ature 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 air0l3i pgpei1 xwy zqzl55r0 91s is 340 m/s. What is 1 zrl59zi0lwx0 is 3q5 pp1ygethe fundamental 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 o8deoc.ki k nm3vx06a 8pen 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 the closed pi 8c3 v8x .n0maeid6okkpe?

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67#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Two adjacent sources hw+,:*bob + ;rwoi0x la3jf kheach emit a frequency of 800 Hz in air where the velocity of sound is 340 m/s. How much farther back would soub + fkh 0,bxwro*+lw;hjo:3iarce 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 driven by the same frequena i/zz;xs 1fm2cy of 500 Hz. If the distance from a person to one spefx2 zm/ ;1sizaaker 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. What is the beat f/o,pszz1:z *tpz8 rwu0 tvirx7w,a( irequency?

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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 on:wzaf 8+; f6rwd3/0r mg3:zwlgnsnm i-qff-f a musical instrument. If the tuner hew+gda rfqrnff/ wlg3:86 fi0 zm3:s-;m-nwznars a beat frequency of 2 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 twy+vq) t2k 6g7. qk0 )mtklzouxo 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 sound is o) ttq vkxz2) y 0gmlkq.uk+76340 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 orn xxb4s iw2.(rv q-d3pchestra 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 samerx sbwx(pi2d4- n.3qv 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 100z bxr; mptvd(kd7b764/ p-8td q-idmc0-Hz sound source at twice the speed of sound. The observerpmd4/ b 8;-xdbc(d6v zqpr- tkt7i m7d 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 of 1000 Hz) appc769w l-fz94 a8taloy ox4 rvrroaches a stationary observer at one-half the speed of sound. The va 9l4lzoc6o9aw tx 8r rf7-4yobserver 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 sk.po8df h*0y kpeed of 30 m/s away from the source, what is the frequency heard by the observe.k0odk yfp 8h*r? (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. ;nx l 9dhviho+;akv+ .It is traveling at 35 m/s on a day when the speed of sound through a;aki;volhhx.vn + 9+d ir 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 a m*;2k.gdvszheard by a stationary observer when a train approaches with a speed of 30 m/s. The frequency of th md.a* zk2vg;se 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 bl9*b ftnsuw3 zn9kr03iows its 400-Hz whistle. Take the speed of sound to be 340 m/s. bz 39ukin390sr t*nwf 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 stationaracf .x+r vm;r h+x6h*ry train. The train blows its 400-Hz whistle. Take the speed of sound to be 340 m/s. What frequency do yomr;r+vca+x h*r.fhx 6 u 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 ,z8t*ohcjeulvk5 /5)ja .ct cblows its 400-Hz whistle. Take the speed of sound to be 340 m/s. What frequency do you hear?8lz5t)t,c jck.aj/hu oev*5c

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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 ybykvbks0l3t-5 ,q7sb ou 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/s. What is the actual frequency of th - 3,klqtvs5 7sy0bbbke 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(pi w *b8 1vh qh.)oujm*sm5,4khzhio air is 340 m/s. What is the frequency heard by an observer if the observer is moving away frovohqs m*u1* ,m j.p8bz(h hhi5)kw4iom 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 is 3ru f )i 470:fyfi 2qix*i/wwfk40 m/s. What is tx 2fw:fi47iyf)q *ikiuwr/ 0fhe 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 deteref1d42q/- t o mxdlo0vmine 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 object01 l-q2ovm doetfx/d4 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 aircracle97k6myk;k ft 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 hat r./h2lpn+bi lf-angle of the conical shock wa.t+p lb2i /nrhve formed?

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87#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The Concord airplane 5t0f,(6ntxg6. abse bq/sv5 gml1nwg flies from the United States to Europe with a Mach number of 1.05 where the air tempgf6 1(.tg,b/s s5nnt 0w ageb6qmx vl5erature is $5.0 \; ^{\circ}C$. What is the speed of the plane?

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