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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* u.ew0ysad ,lpxmjp s28dc,6 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 throu8ni v36ngo0 osni7q5wgh

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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 steeltrrkg;h ; 1y,b 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 / eg/tpmu,6u96nfvvihappens to the velocity of sound? (Assume that all other factonuim6e p/ t/u f96gvv,rs 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 ok 3u7*ybvq-dco ;e 1lox1ve o.f a 400 Hz sound, the velocity of a 200 Hz sound througeo7 boyxq 3vc1vk1*leodu; . -h air 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 sound i-6 umyqs 4m 9lmtll0p;99u sxm,zqgk; n aip;yumkgu9l q lt 94qs lmmx;,m69s0z-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 )gkm:k2+um qxtol :h *than 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 frequency less than 20 Hz are 7j9z uqp8.j6mn3vsn gcalled

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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 dg cled+x9yzlja v +4*/irections. If you move to a point twice as far away froea/l*lg4v+ c+9 x zydjm 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, intensmgy(j06tch ,a 5 yb1mjt8+5aicrpl 0a ity 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 distancw/tfv .8mlg+ hopg *m9e d from the source is I. What is the intensity at a distg +m8t9vfm*o glh.w/p ance 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 source that is radia9i zz:b yio* .8r5 xs43xghhesting equally in all directions. What happens5x9g.y 834i*xhbzh :ssroz ie 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 soundv. d1uf .v7icw source that is radiating equally in all directions. What happens to the intensity level of t.f7vdw .1u viche 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 inck1wm)i; egn)kreases as a sound becomes 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 speaker emitting a pure tone. Wxsxd8i*x y h )b-.j0*v -kxjvkhat characteristic of the soun xyj.kxdb*hs -x*kv 08x)ij -vd 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" of 5bpcu j u-0pt;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 "piti9jkn)(/t 9ct) l:b/n wxp trbch" 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 ai-ibmcvq9 0 *wxr 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 rw pxzv);5)w ie6lj 3sare

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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 geneka d85iiw 86x z;fvz1;tt1u fyrated by the guitar as a result of this vibration. What do these two waves have izy8f1;k8 a6;1t tfuiwz x 5vdin 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 endsssu6e5fh*5s)y r l t;v, 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. What are the wavelengths of the thrpqz up2fmii.1r +/. m ic03swaq8fus0ee lowest tones produced by this pipe?cz i s2qwq.u pa i+fu s.mf30i08m1p/r

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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 pipey adu:j1(ms*cj+ / eph of length L is 200 Hz. Which one of the following frequencies will not resonate in *: 1ujaes jp dm(h/y+cthe 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 fundam8mbnq-bkl lia;91my7 1 cgvb( ental frequency. Which statement is c1ni;(gc l78klmyqbm9-1v ab borrect?

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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 cl/r /pi4u -twkiosed 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 azxnb8v d0n:z0oxgp8 6m -;fq rre the wavelengths of the three lowest toovq;xbfnr80z gdn6x8:m 0-zpnes produced 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.d,1g+n fq2uua Which of the following fg1a+ 2qudnu f,requencies 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 ;ym)80x c,i1h3j 2y)vrf roa ih;rvpzresonating at its fundamental frequency. Which statemen,yrp zh x2irc;i8 mva)f yj 3hr1v);o0t 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 speakebq 3, 9hckrgy3rs 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. 3, 9gbrcqyhk3 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 ia( qo;d;kn1k*eaq9sww vs1+ 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 swd mxiof+uz)- n/l ;j6ounded together and a particular beat frequency is heard. What happens to the beat frequency if the frequency onflm)-+uzd; j iw/6oxf 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 explaiuy/m rc oc 4al091o zb(gtl9j4ns

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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 i/zu;ki1tks yh p20yw3 ct7 f8the observ; iycukti01s27fty/ 8z3 wk pher 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 s. kryva:1nji+fb/8 je tationary observer. The frequency heard by the obs+jj 18 n/:.b yifvraekerver 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-spc z3fdu go*:y hb,avom0 86+vxeed, its half-angle will decrease by a fac+zgv6oxy ,hb:ofdc 3m* uva08tor 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*)qz y)ahq 4qv 45 kHz in air is 352 m/s. What is the air temperatur z) 4vqh*)qaqye?

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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 7/0n ia:jva 5wdbj jqx0*)sbcin 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 bat nwu sw 9c(s23hemits a shriek whose echo reaches it 0.0250 s later. How far away was the object that reflected bau9w2s3ws (n hcck 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.daslcc .-5j. sja:tk0wp kt3 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 lightning, the distacgl4napp qv-1i ,rr(+ z(8saonce to the lightning strike is ar41 v ao8pp -a,n(+qc(zlisrg bout

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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 *fz3)l 6n x.9ajnadlz 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 later. ;6skvnfgk3rm/ ehn*l k ekq5y,1w:z9 :.rutoHow deep is the well? (Ignore air resistance, and av:u; 6eork9, rgnwsfknkt 3*z:/q.1kh5lm ey ssume 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 hu4/ w)-isum qa 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 air uhtrx( l(mf2sp5bsx b*54-n wat $23 \; ^{\circ}C$ 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 intensity +df0juut08c g $10^{-3} \; W/m^{2}$?

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47#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the intensitye o 4;s 74er982jr+acaqzk qba of a 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 two sounds with intensity levels of 70 d 0)arlkqp b7d 2a,70rte*uqzpB and 4 r7blqt7au2*d0)r0 ,pk zpaqe0 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. Wdivjwr.o n8 t. vxt ig2d.0 0oa:aw5hw-.0acdhat is the intensity level generatedwwa5o .vd0 8jd-a.tit rdi 0ng hvw2..0oca: x 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 thairlouj3+s0t5hk*s9 c- az)lc47e e bit is radiating equally in all i9*b4s zlcsiaek5reju+ lt0h7oc )3 -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 distance of 6.0 m from a source that ia)(dss -pu/zw s radiating equally in all(aw-)/z usdp s 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 assumed to be uniformly dg060bfz)vll tuifi35zoi6 (i j s-1wq istributed in all directions. What is the intensity level at a distance 5.00 m from )0 3 16j(fol-b0vzzi 5ilf6 sqwguiitthe 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 aot,n:u. y+ kgtt a distance 5.00 m from a barking dog. What would be the intensity level if two identical dogs very close toty: +ko.,ut gn 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 md; m h;rq/ze 5otrbg1/oofy,7 from a sound source the intensity level is 60 dB. What is the intensity level (in dB) atqz1t5om gfoo d/b7r ; ehy;,/r 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 l/ b6uq 2ha1oo j,:f* p0fli*e.xjuruwevel 5.0 m from a point source is 95 dB. At what distance will ituu*/o: a.6,lfio qx e 20rfjuj1h *wpb 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 jt,5 gdkw (h-d(eo;l5rf 8dgmii,k) ns42 vhucomplex tone has a frequency of 1200 Hz. What is the frequency of the fourth (,8u)o d(d,hj-;5l mi dfw vn2t4e5ks kighgr 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. What is the u*y p)t+9nekb length of+ ey*n9tkb)pu 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 r 76vmzxjs8( nopen pipe of length L is 400 Hz. What is the freqn x z(msj8r67vuency of the 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 bod2 xt.l- ,n3 nnsq.wbkt94ad fth ends has a length of 0.80 m. If the velocity of sound in air is 340 m/s, what is the frequency o xlq.w34-kdtdn sn a2b.f ,9ntf 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 /:ys zugq nqqp0/ c,9croom 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 frequeto crb-13; /g hkp.nlr.6znjp ncy in a pipe closed at one end is 330 Hz. What is the frequency of the third harn 3hb -gnrt/zj6.. opp ;cl1rkmonic?

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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 on2 z8)i6 trjlnw one end that will have a fundamental frequency of 60 Hz on a day when the velocity of sound is lrn6t)2i8 wzj 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 8r3spxfsevnc40w2q,;rxpxcr zv l k(+ p+ ( f,room 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 ro dw t m;7z( uy6w3b5lltx0ue.gom 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 a7cmzpi5xqoc :* u/jr:ir is 340 m/s. What is the fundamental frequenq/ou*i rm 7pz:j:c xc5cy?

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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 lelmtvy9 : r a+(a)8opgnngth: one is open and the other is closed on one end. If the fundamental frequency of the open piv m+9ny(o 8p: g)latrape 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 800 Hz in air where th,fvoh;33vscw kni,1s e s x,y(e velocity of sound is 3cvvwi,s ,hsoyekf s,n1;3 x3(40 m/s. How much farther back 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 driven bu2op+ .q-d vqjy 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 to the other 2-uq pvo.jqd+ 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 and6ozz7y.fxdm yj;bv c*+jn:i8m 4tc69o / csck 444 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 a musil nha6cqmldh .q:u4b )lc*e10 cal instrument. If the tuner hears a beat frequency of 2 Hz, what is the frequency of t:lc e 4*d1)nuqhb6llmc.q0ahhe 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 respectiveli wk-hyvk,-9td :j3qw y. What beat frequency is heard when the horns are sounded on a day when the velocity of k: -3ywd- wiq,jtv9 hksound 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 violins in an orchestra are found to p6l:q yx2gr0 fex/i vda71)obxroduce a beat frequency of 2 Hz when a frequency of 660 Hz is played. What percentage change in the tension of 2 a7)exgr0l xd6yv fibo :q1x/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 sq nbc5(dqkty (:/fy 1dound source at twice the speed of sound. The observer hears a freb kfq:d/(dn 1tycyq5(quency 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) )q:hccwlp6.yzn1o bsi+n 5;iapproaches a stationary observer at one-half the speed of sound. The observer heh6bn nipz)co:sq;1.w il +5cy ars 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 w27qb9)qp c)vtc,1sl c- lvcxeith a speed of 30 m/s away from the source, what is the frequency heard by the observer? (The sqtc2- 97q,xcel)lccp v )vs1bound 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 sirenf. i qq9f,i kgp:qmp:/. It is traveling at 35 m/s on a day when the speed of sound through air is 340 m/s. The car approaches and passes an ob/fqg pqik :fi: pm.,q9server 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 heard by a stationary observer when a . hyzc 6wdl14d, upqk97 3dycjtrain approaches with a speed of 30 m/s. ,ddc7 qpcz6u14 3dy9hw ly .jk 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 travelingt nu2 -apsuq l6 x/hv9/7w-unz toward you at 120 km/h. The train blows its 400-Hz whistle. Take the speed of sound to be 340 m/s. Whu utnnqux-zhsl2v97/ /a-6pwat 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 stati,wi-n 6.jfi rgonary train. The train blows its 400-Hz whistle. Take the speed of sound to be 340 m/s. What frequency giw jri-f.n ,6do 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 l)y5db thbw5hs 0s - 4n52tjuablows its 400-Hz whistle. Take the speed of sound to be 340 m5abbhtnyutljs5- ds)h 45w 2 0/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 5l4 okxy+ulio+v) t:l 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 i5:vo +yo+lt xlu4l)kthe 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 sou0yls8lrq+(wd ojit, fpap3(1nd in air is 340 m/s. What is thpa o3pi1 j(wfdl(sr +0qty 8,le frequency heard by an observer 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. k d,vbf0bn2b0Assume the speed of sound in air is 340 m/s. What is the frequency heard by an obser,d0nfvbb 0k2bver 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 an object. A 40-kHz signalq,(qk(;af:*lyml rdd is sent out, and a 42-kHz signal is returned. Assume the spl kmd*,d:lrqa ((fy;q eed 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 c6 tqe1k:+a* jj2zbx yz/a3s q0/m iqpkonical 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-ang; afwt4de-93idpeti. le of the conical shock wave forme. p9dtfit3iwe 4; -aded?

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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 q hr49z0ujypgpv 2*h6number of 1j 0h*p94zuh 2r6ygpv q.05 where the air temperature is $5.0 \; ^{\circ}C$. What is the speed of the plane?

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