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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 statebm +mpq 54wmj md5:q8sment?

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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 cyuty kbzl.qpnf 0*j11-nhe ;7onducted 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 svfpqgzg . ;/3shy 42tcound 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 increasesyql+7f )m5k 4sql r6qx, what happens to the velocity of sound? (Assume that all other factors remain5flm4s7q+qq 6 r kx)ly 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 obix7p6/ v)sgxp( iz i/btl58uf a 400 Hz sound, the velocity of a 200 Hz sound throupi/bzlx)vb6p ( 75t/i s gxi8ugh 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 yf4 k (qr9dmi 3sy;jr( jnc71ta 200 Hz sound in air irjy(m7q; r n1 ( 39fijkcy4dsts

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7#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Sound vibrations with frequg1xr;z z 5 p0ip9c5s9bun5y zkencies greater 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 fqanf6p ea (-,.bh8u kbrequency 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 +j(ih d6 n5takggy5+l60 jwwb waves uniformly in all directions. If you move to a point twice as far away from the source, gkn jy6wt+ il+b 5d(0agj65whthe 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 -k j81el+bjn(r.sn36low qo yxn:*kn 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 z.og n 7a7z7uu; (zohqthe intensity at a distance 2d fromqou(z;7unh . 7gao z7z 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 rae9 t9urx3j)l zdiating equally in all directions. What happens to the intensity of the sound? 93jz xl9 ut)re 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 sg:) tk2+fr vsma+uvnbb:7o- sound source that is radiating equally in all directions. What happens to the intensi ::+fs) ukr7-vntmvbags+2boty 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 s gn;7yijr.uh vk w us)5*fq:,iound 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 speanps/4 fwwhr p wlb8y- cjib(4ze165k6ker emitting a pure tone. What characteristic of the sound inc5be l641yp hps86kjzwf/w nwr i-4bc(reases?

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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 musica dwjbz5w6b1vt5*k 3 qfl 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 musicalj5q*3nfcfxe8 u kvc/), mx 5ty 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 into 9q 0glr)m8npl:cr kp d54(j miwater

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19#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Pressure and displacement way;ms2 f(l-7x p fsnzo(ves 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 the sound waveu ,c)o,5kqv kr*n +qhk generated by the guitar as a result of this vibration. What do these two waves hav,rq+)5, n quhko *kkcve 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 gi+r 5jk9wm;oxzx99 1c wt5 sjboth 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. What are thr*4u8y:tw cz+hx - ocrxun4)c e wavelengths of the three lowest tyx c8-uc:ocxwr u4tr4z)n+h*ones produced 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. Which onej1gcz whyr+)/ t dw4r/q3y oi5 of the following/ygr wrwjq icy+4z)/53od1ht frequencies will not 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 length L is resonating at its fundamental byzb n9 )l9 27gztc-(hf +/tdi0 e0sit.zyrsyfrequency. Which statement isetly-hid0zgrn0z i2/ tbc 9b 9 z+(t.y)fs 7ys 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 the othe c*atu b(x4ee)r, 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 ard dps:r+/f.gih/ 12r2:g hqza*bpgkze the wavelengths of the three lowest tones produced byh/ip +d /g:q* hk22.gd ba zp1fz:rgrs 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 dp / ,9hk n3dehgn6hw8length L is 200 Hz. Which of the following /hkn3pd n9d6h e,8whgfrequencies 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+pq d,skg4 ie5cyau;2v o)w 3a its fundamental frequency. s)oa,gwk i5e 3 +ya4du2c qvp; Which 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 sa8plac lm9ij;csjnl9y6 4g e,; me source. Each speaker produces a tone with a frequency of 200 Hz on a day when the speed of sound;i js lyncp89j9 l64lg meca,; 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 wagknt :)oij +zhtz -2p6;9wh;nyyptj ur).ub 4ves 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 srorfn;nv p8j*rf -c4 ,ounded together and a particular beat frequency is heard. What happens to the beat frequency if the frequency of one of the tones is ,8;*jv 4rfp o-rcrfnn 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 explaxxzw-x+k9*s5e4 uc soins

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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. Tk s+idz ;c3wuhr-45yy he frequency heard by the observwyc5h +;4-u3kdry z sier 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 fromfy cq(c0dg*a4 a stationary observer. The frequency heard by the observe (*4a 0cdgfcqyr 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 ha2r)mqv bcu g31lf-angle will decrease by a factor of:gm )rv uqc321b

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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 4tzh noe by 4bye0yfbku2 c6ij(*z7(*95 kHz in air is 352 m/s. What is theyfb *cz09* bbu 4jy((e he 26tzonkiy7 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 sound imr 7jy;(gwx1esqf a5 1 t++gdo3:vnt rn 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 so vds yh:agwna5) 4lt0:und in air is 340 m/s, a bat emits a shriek whose echo reaches it 0.0250 s later. How far away ag wd:l v hys0):4tna5was 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. The temperatb5y d-- fi6llk-bn vb/ure 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 lightninq-fk;zufp0uu: e s3zuq50j f(g, the distance to the lightning strike i(;0 u 30zsq f5pfj-efu:q zkuus 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 p/ 0gr he1(q93bi+ j wpg*mqrxthe 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 splaczy u47 o6y)xdyum02m sh 2.5 s later. How deep is the wexuoy)y07yzm6 2m dc4ull? (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 zdz4 s- m.avkm hf-i14of 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 a-zsq1s cc)o*r t $23 \; ^{\circ}C$ 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 ls.qr6xc(4prb o 8bwy7evel 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 o)a,qap kuv 8h p*:i(2vbhvxi :f 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 8un6m2/l( iz p-xro( rf8xfteof 70 dB and(u n lrz rxxfp68 o(f-t/2ie8m 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 intenc84kikl k 13czvlk 9k(sity level gene9z4c likkk 8k1(kcv3l rated 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 radiating equally in6c tb+e -jyzf3 all-f+c6 e 3tjyzb 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 f:/durf olqth8z3s x /.b4k)bn rom a source that is radiating equally in all directio/: bkrh4/do fnq8s )lz.xt3buns 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 avo9y +tehx;e89w*zdp 2ks 1x mW of power, which is assumed to be uniformly distributed in all directions. What is the intensity level at a distance 5.00 m from the dovph ax8se2z ke1x;9 w*y+to d9g?

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53#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The intensity level i/2yzm;5z6e t9.sj hg9v huj7yz h.azes 65 dB at a distance 5.00 m from a barking dog. What would be the intensity level if two identical dogs very close to each other are .tsyjz 9 gh2h ayv65ze zj9;zme/h 7.ubarking?

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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 zpq6zx uk 6)6d ry+x7xsource the intensity level is 60 dB. What is the intensity level (in dB) at a point 2.0 m from the source? Assume t7 kqr)6xxp y66dz+uxzhat 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 point source is 95 dB. At whad t:ny0d id.h-l;z ua1t distance will it be 75 dB?dn: i.-ddlzatu;h1 y 0

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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. Whahjmyw abu-bhz+mu(39 2a5) r kt is the frequency of th9-r(hk jb h)mw3zama5u2u+b ye 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. What 0ozoacl(n:d0m* omr6 is the lengmaor0omzc( 0d:6n*olth of 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 g,5s/6mri bz sopen pipe of length L is 400 Hz. What is the frequency of t s z,65msi/rgbhe 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 both ends hp)mn1 ww*jm5 un6hvz1as a length of 0.80 m. If the velocity of sound in air is 340 m/s, whp5 1wu*n1vz6mnmwj )h at 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 h7q nbu0ucn-(y6kg c d3q1z,oa 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 38ixnw 63wv 0nbt*lwv 8s( rs3f30 Hz. What is the frequency of the third harmswlvv6w ftn x (*80n3i 38rwsbonic?

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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 e)aq3zzgs5;xk nd that will have a fundamental frequency of 60 Hz on a day when the velocity okgaq;xs z )53zf 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 wherego6, m qcga z/8y8ckmc77aifk8f , ad+ 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 temperature iew4;r.u muv3w)j0a jnypp,bu ;: ds:ps $20 \; ^{\circ}C$. 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 souc/d0)qp azg q-nd in air is 340 m/s. What is the fundamental frz-gd0c p/ q)aqequency?

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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 i7yqukiu u5/p+yf-cs, f l) ,bys closed on one end. If the fundamental frequency /pyusuyu fi+ly,,57b)kc - qfof 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 eachimkl-2+a9 qgx emit a frequency of 800 Hz in air where the 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 sources wmx-k2 qg+al9i ould 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 frequevaajcd6pt0 6(t xty7.ncy of 500 Hz. If the distance from a person to one speaker is 5.00 m and the person detects little 0d6 ajpc6xvat7y( t. tor 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 i3ae1r -jl7iu 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 fren5adp1 - cv;jxquency of a musical instrument. If the tuner hears a beat frequency of 2 Hz, what is the -xpva c5j1;d nfrequency 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-pb;cw 4rtwzzd6(i5 z 31wgti m and 7 m respectively. What beat frequency is heard when the horns are sounded on a day when the velocity;ztw itr4zci z-3w1p(bwdg6 5 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 violins if8rr7 v+9:bp5ztx* g xqqwz7a n an orchestra are found to produce a beat frequency of 2 Hz when a frequency of 660 Hz is played. What percentage chaw+rt9z 5fvbxrx7q78 *zqp :a gnge 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 sourcexg*g*r2b hvd 7 (baxh: at twice the speed of sound. The observer hears a frequen *h2:bx( gxvbh*d7rga 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) appr4kru++i95xjru1 e.c az *2 ipxxj5 mgeoaches a stationary observer at one-half the speed of sound. Ther5ie c9z.4jp+max xkuri*j15+ ge 2xu 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 1;3y 3kj.qeqhol 8-gt ;hslk 5v000 Hz. If a listener moves with a speed of 30 m/s away from the sourck lokq-ehsq . hgl33y5;8tvj; e, what 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 m/s on a day ws0s,rme kp0+e hen the speed of sound through air is 340 m/s. The car approaches and passes an observer who is standing along the roadside. What chan +,s e0kp0srmege 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 pk3d*m w(6dcrwhen a train approaches with a spk*wmddr(3 cp6eed 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 tb6.mgmn3y cu 2oward you at 120 km/h. The train blows its 400-Hz whistle. Take the speed of sound to be 340 m/s. What frequency do you h6 23gcmy numb.ear?

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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 blows its 400-v6vgih.k;orcug u;m 7 b; n)t.Hz whistle. Take the s ; .u;.ing7tv)6mob r ugchvk;peed 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 qwl/.nuxzx zv;;xr069bt w: yits 400-Hz whistle. Take the speed of sound to be 340 m/s. What frequency do y.u xzt0l q:/ bn;xy96x;vz wwrou 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.j93zp vt+ wrn(wct5 ( qwl6wj9 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 frequencjwrttpcl5qv w3w96znj(9 (w+ y 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. Assu7- ydzy7s:.qhjp ib5r r51fheme the speed of sound in air is 340 m/s. What is the frequency heard by an observer if the observer5ip 7-7r d.fqyes:yh 51hjzb r 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 :mh(-jysr /h ua 0q u.i4tp1ysz ;vs5nin air is 340 m/s. What is the frequs0v/;t1p5sm(h4r - .yn: hsijyauqu zency 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 determine t23hio2ks4i ps2z7g fkhe speed of an object. A 40-kHz signal is sent out, and a 42-kHz signal is returned. Assume t g2sif342pishko2 k7 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 supersnkn ura)r:f6w 7wdz)zh7j 5h.s( vr*t8hz cj +onic 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 zm4a0* d(npn p 3,fwugof the conical shock wave formed?au *n 0(,dpnwfzpgm 34

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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 t7hb;b mg,:hz do Europe with a Mach number of 1.05 where the air temperature igz bb;,hh7:m ds $5.0 \; ^{\circ}C$. What is the speed of the plane?

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