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习题练习：Physics Unit12: Sound
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 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 followi//nmf y.fxkl- ng is a 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 thipub(vhu)ov2 d9d)7f rough

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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?;-gm bt c, z:p/arngm5

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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 sound? 7;3 mrr5p 0 grn9)feu9v4v pfisw0qkw (Assume that all other factors remain 59q0vkgwp7n; f0rmvrs4iu )9 w3 rpfe 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 7-1ppa1:erhml1znj e r6 - rbuHz sound through airpl1u pr e-an1 7e-hr61zjmb r: 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 s 6i6o-yzkx3um ound, the wavelength of a 200 Hz sound in air6 mx- izo3y6uk 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 Hz are c/s7i z(ujnbxy+ ypg (1vah6s-alled

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8#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Sound vibrations with frequency1ysxoa8 q ,vw3 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 tosqbg 6q7j53by (3amf h x-1rwaves uniformly in all directions. If you move to a point twice as far away from the source, the frequencm6rg(fas- hy3q3b7to qjb51 x y 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 divergin0qwry8(8 fqboo9:e)u 9xhd jsg 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 po*b 3c;y tbmpv,int source at a distance d from the source is I. What is the intensity at a distance 2d from the;,t*yb3v cb pm 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 sound2pmqtied h+my-gg3 wmd:y( l 5qe07-n source that is radiating equally in all directions. What happens to the intensity of the sound? I:hmplenmi5y md +w(tq 0y32 dq7-e -ggt 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 radiatingdkqgb ,nbnb7u: 4r spdl h-(6h*p gg:4 equally in all directions. What happens to the intensity level of the sound? I* 7n:bb (h4,-glgprddunp6shkb4q g: t 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 incr3b3r xl-hk k0ceases 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. What characteri 20ni9yt3sqyk- 1pz )fzrivat8 oo6-vstic of the sound increasesz 38i9n0sf-az 1qyoyv6 ov-k2 )ttrip?

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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 muisvnm-q 8;6c(1j; vzwibdx k.sical 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 a7a 7c3q):si bi ft+jni3peg /x 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 airgaat e*5*vccfd7lqtr2;7s/ 7jh 3tzu 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 displaceme. /u d8vesbd2rovdu2 a,0y rd5nt waves 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 waqhn vple- :jd;52vvfn +4w6xxve generated by the guitar as a result of this vibration. e fv6x; +j42 vv:-nqhxn5dlpwWhat 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 jcc,kg*:*a8xlsd u):;kc tnd 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. What are the wavelengths of tz n(r5ow.+tdk0i9brbhe three lowest tonebb(+0 irrzw . nd59tkos 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. Whm.nu ur( 1kw5lich one of the following frequencies will not resonate in the sl(u1r um nw.5kame 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 lengen/utsf w;0tc /6h3ybth L is resonating at its fundamental frequency. Which statemenh y6wu/ net;3cftbs/ 0t 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 th-lat ppa5xiv7u8 j3y)he-s rh;*bb:te 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. 8 x9tshrj: c fh4(;ler 4oakb/l u+jv4cr0h,tWhat are the wavelengths of the three lowest tones produced byu(l+hj b94s8 4c l0;v:th/e rchrt ar4ojfx,k 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. Which of 3 fqtms5c (lo7pwsu(b7dm4 , pc27kbbi r6(uf the following frequencies will not resonate kq7 p4 m2dr,b5fup s6mtlc owbcfbu(7si73( (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 atohzr;mu6:m) epi+ .uj one end is resonating at its fundamental frequency. Which statement is com6ru) :.z phuoe m;ij+rrect?

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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 speaker pyqm8jou1m8/ rroduces a tone withqu1o m8ry/m8j 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 two sound waves shoul0etmoo0uzei)z5 36qi d 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 s .r5n etvou48u4g0wbccem 7(vounded together and a particular beat frequency is heard. What happens to the beat frequency if the frequeu er58(cu4te0cmv vn47b.owg ncy 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 exs arwhhx+):-9 ck-lt bor w91wplains

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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 observm*r d jo4zie;8e:7oq4o hwa* zer. The frequency heard by the observer hroi8 ;oeem*qwzj 4daz 74*:ois

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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 ub euo4 *oog-5 nz1n;dstationary observer. The frequency heard by the observer is5n un uz*4o-gb;d1ooe

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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, i d(i4p;3 mpgxw+ma i;md+ghm7 ts half-angle will decrease by a fa3idm+gg (xm phim;4mda;w+p7 ctor 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 +8.yr4k pkf6n vgngc1 352 m/s. What is the air temperatur+4knk cp16 gfy.rv8nge?

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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 atuv/*;aiqr0:z ofz 6wjv. u0pd $0 \; ^{\circ}C$ 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 spe-(lzd5kd9f l 30k 49 oohgwiwked of sound in air is 340 m/s, a bat emits a shriek whose echo reaches it 0.0250 s later. How far away was the object that rez l4okl- k9hdg(if 3wo9wk5d0flected 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 h5mmi0u4 yh.w hear the echo in 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, ) 98lowqzg j9tthe distance to the lightning strike is abouwlo9gzq)8 j9 tt

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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 cllr48jv/nbou - iff 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 l3xrryrh bi dfg/-6n ss,:fdr+o m:,72.5 s later. How deep is the well? (I :yrfx/l -,f:b d,srdsogr6h 3rn+ m7ignore 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 frequency 500 Hz ipw 5s4,hr slkh;) tyhwl36d;vs

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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 awg* v-efcl a1f*y k/5tt $23 \; ^{\circ}C$ 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 intensit7b nc6.vvma2 hy level 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 ahb)+grpjsnn*z7v d/ lx-u 3f) 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 theh8w4hq hx p*dg7vm.1l intensities of two sounds with intensity levels of 70 dB aq8whlg .pd14h*vx7mhnd 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 in,tl z k1(9r0jqa(juffuu 4zc98 fyd1 ptensity level generated by of14zp9ul9jja 0fc ,uf ((8rq uktdy1zne 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 i/hv hva42n6 hts radiating equally in all directiovtn6 4hh2ha/v ns 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 ofbu7s /btv.o)t f5*hl6 d 9kwpe 6.0 m from a source that is radiating equally in all directions is pkls6fv/b.tb wo*uh 59 t7)ed
$6.0 \times 10^{-10} \; W/m^{2}$. 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 ber o43 jb91hpmn uniformly distributed in all directions. What is the intensity leveo1 9 hrpbn3j4ml 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 barmc+mji:v lenr; :4lguvb;(z 0king dog. What would be the intensity level if evcmvz;g0: lmj n ;iu:(r+4bl 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 lev ,oqt ; ozp2okp:-iru ,fx*kbv/c /y7sel is 60 dB. What is the intensity level (in dB) at a point 2.0 m from the source? Assume that the source radiates equally in alf;/uoy k oqkicro,v*bt:ps 7 zp/-x2,l 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 5ixse8u; 2q /yv.0 m from a point source is 95 dB. At what distance wiqs ;iuxv2/y8 ell 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);grp u g/hcfa5+vc)lj7 sry: 1200 Hz. What is the frequency of thej)/ rag)lc7 hrvc;p5u sg+fy: 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 pipeq9s hyttf 62ykz2l2gn a3y5y3 is 900 Hz. What is the length of 32yly 23qh gnszf2kta5 t9 6yythe 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 reco(su x0s k;p*sonate in an open pipe of length L is 400 Hz. What is the frequency of the lowescp*sxuk s (;0ot 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 has a lengtllzm1y- 0u ;t ;*nae4 npe;ruwh of 0.80 m. If the velocity of sound in air is 340 m/s, what is thuee;tlr; au 04y;-znln p1*wme 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 rois2 hn40 lb0xcom 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 33o1oj .kcnv(v 30 Hz. What is the frequ.1(c3n o vjvokency of the 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 closed on one end that will habo;1 7egifo9(*zx:pia3ey m xve a fundamental frequency of 60 Hz oi og7x91z omi x e(byf*p;ae:3n 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 ter9,apbw8;bge/ zx sz7mperature 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 *4e8own cp7b)jyum 0yi2 wsu 3temperature 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 wh4 qybs +a;4b ul8f aau*ldao-*xfo,x2en the speed of sound in air is 340 m/s. What is the fundamental frequency?xa+2 ,qfydb44flx8basuu *o-al oa;*

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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 t sr(rtx-,7 no2tgzf6is closed on one end. If t f7n(grozx r2,6-tstt he fundamental frequency of 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 each emit a frequency of 80 mlhn3j0l4swzkd 4t f;6 d3vp(0 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 obflj4ld( zt ; k3h spwv6nm40d3server 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 l6.dr:0:q.hb / xzqh3d sw f-anrc/wusame 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 therql-adx3:sh.6rhwd q.: z/0ufw cn /b 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 zpoa (wzt76ph1 zip* 5yd5a29ijejj0 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 eqcg/o-z ts:, 3) mt8iu (xtjgof a musical instrumenum o83qg(j) :,tzx/sgct-ie tt. If the tuner hears 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 tll6+0m37 nee6 1l toxrbjg4mrhe sounds produced by two horns are 6 m and 7 m respectively. What beat frequency is e l3re m 1mb6g 7ojlltn64r0x+heard when the horns 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 violu lklx,-fefvhy-: )5 fin strings on two violins 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 would bring them to the - u:,f)yel- 5fvfxlkh 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 )l*r6r g , +mzys- u1 tkoqrsl c(x3jki(o7od*source at twice the speed of sound. The observer hears a frelq7*or ) lsi,-m3ur 6roxkdyst1j(k*c g+ zo(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) approaches a stationary observer z4l* cbu*rf,zat one-half the speed of sound. The observeuzrcfz4l b **,r 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 speed of 30 6u+7t jh2b fnum/s away from the source, whaj+ 6tnbufh2 7ut 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 tra 0.donx) hpzmgm5y 2t+xw 4)qyveling at 35 m/s on a day when the speed of sound through air is 340 m/s. The car approaches and passes an observer who isp+oy tn.q d5mxyh4wxg 0)m2 z) 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 wheibwl/h:)ncotb: k yioh98* - cn a train approaches with a speed of 30 m/s. The frequency of the train horn is 600 Hz and the spekcob9/i hi)*wc:bl8 :ht yno-ed 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 j- th sq*8uhpud;-re. d ua;e7120 km/h. The train blows its 400-Hz whistle. Take the speed of sound to be 340 m/s.q-8uj7 eeshud*;rhtdp.-u;a 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 train blows its 400-m iczo j c1l6; y;o(/t)wolu4i):byi bHz whistle. Take the speed of sound to be 340 m6ii ) m ()b bcou4/:o;i1ozyclj ;ltyw/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 400f,jw.npca v e l/9u64ta.,lpg-Hz whistle. Take the speed of sound twpla.lnp694j gtvuc,a,e f ./ o 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 whis nwri. d7;jdu4ocn: ts ;0f-qxtle, and you hrqx-jw td i;of0:.;7n4cu dn sear a tone 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 horebbm8z +ck*(ov1erir:v mk --n is 500 Hz. Assume the speed of sound in air is 340 m/s. W km*ir1v zm :ebkecbo8+-v-( rhat is the 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. Assume the speyqg(c881o 6ehfxk/lzqyc+wr m5w r 3 9ed of sound in air is 340 m/s. What is the frequency heard by an 8er5 6+yx3qw9 gkm1 coc hr8wyzql(/fobserver 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 tx-z l.rvg+od*he speed of an object. A 40-kHz signal is sent out, and a 42-kHz signal is retor.-zl gxv*+ durned. Assume the 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 p u1)pqm:; ed vd(t5jc+ *npqpuroduced 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-angle of the coni)jf 60appt0 d pk(sbt1cal shock wave s6t dj0)f(ap b1tp0pk 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 flies from the United Stc:h pvmr+6 w4l99bq27 cht glsates to Europe with a Mach number of 1.05 where the air temperature ihc6g2mvqsh+: 97lr9 b4wcp lts $5.0 \; ^{\circ}C$. What is the speed of the plane?

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