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习题练习:Physics Unit22: Electromagnetic Waves



 作者: admin   总分: 35分  得分: _____________

答题人: 匿名未登录  开始时间: 22年08月28日 10:07  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  
  The basic equations for all elhq3 x*q6; :x9fipsbnfectromagnetism were developed by

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2#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An electric field is procfu2.gb23551w4x ez jsw3 sa pwpay(n duced by a

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3#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A changing electric field will produ 81oyl0y:pu rxce a

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4#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  All electromagnetic waves tpy8i/ssj1 aw9 ravel through a vacuum at

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5#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a vacuum, the velocityxvw-s*h-v(g ;s; yohxx :1 bx(vky i8n of all electromagnetic waves

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6#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Electromagnetic waves can 3a9v3jfnxbp u.t i+l d.fx*2j travel through

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7#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The strength of both the electric and magneus8y)n4v4 uu xtic fields in the radiation field are found to decrease with distancu)s uxuvy844ne as

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8#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The $E$ and $B$ fields in electromagnetic waves are oriented

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9#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An electromagnetic wa+y8/nl;fq, ro vwt()y hycx)ove is traveling to the east. At one instant at a given point it(yhc)xrqv+fo ,tly y )wn o8/;s $E$ vector points straight up. What is the direction of its $B$ vector?

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10#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An electromagnetic wave is radiated by a straight wire ay d7p hlp iw0dy*(o)wv, u;m,lntenna that is oriented vertically. What should be the orientation of d lwyy;mw7d v)0h opi(*u,pl,a straight wire receiving antenna? It should be placed

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11#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Electromagnetic waves tp+oub)62aog are

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12#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Of the following, whichv9wc 8rcz 0 .s-c5igu jnnb0.h is not electromagnetic in nature?

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13#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Visible light ranges in wavelength fr-la2rk)1k ddq nx)d df;pk6/dom

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14#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The energy an electromagnetic wave trafo7r/9q csh2lw +j ki7nsports per unit time per unit area is theo+jk 7f7siwhql2/ c9 r

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15#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The force per unit area exerted by an electromagnetic wave is +nl e+ugd 7l8ecalled the

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16#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Which of the following correctly lists electromagnetic wajy)9) zrwz z(gves in order from longest to shortest wa(grwzjzz)9y ) velength?

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17#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If the electric field in8j j(iw l,.s.ohm95rza : 7p uauyf6ml an EM wave has a peak value of 2.0 V/m, what is the peak value of t fll: s76jw8(m jau,ro. 9.apu hyzm5ihe magnetic field?

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18#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the wavelength of light waves if their freque/*gyxh 7zmik( ncy is $5.0 \times 10^{14} \; Hz$?

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19#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the wavelength of a 92.9s0s f alxj(eua,*g*8nwwyafh,s,k7f* ; o c1s-MHz radio wave?

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20#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the wavelength of a radio wave signal transmitted at a frekh2n -a5w2;mwluu / rkquency of 7.2 ul r2wna-2u5mhk/k ;wMHz?

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21#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the wavelength fcza4( un/*id sw4j1 an b1pn:lor the carrier wave in the station WBRN 1460?

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22#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the frequency of f3zhk0fh00o x 20 mm microwaves?

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23#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  How far does light travel in 1.0 msm cnz2ry91x d9?

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24#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  How long does it take lil. w7xh7o bzye/knu.) ght to travel 1.0 m?

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25#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  How long does it take the signal frol 83gm k/zfismkn 1(8/myd nt+ -rs(vum a local radio station to travel 20 miles?

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26#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  How far is a light year (thi11 itjb1-p5xvl j)fp e distance light travels in a year)?

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27#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A radar receiver indicates that a transmitted/lg uyl iahv:h0+) j6d pulse return as an echo in 20 ms after tr0ayh/l) j i+d hl:u6vgansmission. How far away is the reflecting object?

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28#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Radiation from the Sun reaches the Earth (above the atmosphere) at a rate of a96t dv(s4ip +szz ma(lbou(alzz6ds+v9( i4s pmtt $1350 \; W/m^{2}$. Assume that this is a single EM wave and calculate the maximum value of the electric field.

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29#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Radiation from the Sun reaches the Earth (above the atmosphere) at a rate of azwo um;t p3:kxp:-ez -bou3:mexzkz:u p wo t-p;-t $1350 \; W/m^{2}$. Assume that this is a single EM wave and calculate the maximum value of the magnetic field.

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30#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the maximum value of the electric fielcat(m(1oo w+g d at a distance 2.5 m from a 100-W lo+(go wt1mc (aight bulb?

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31#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the maximum value of the magnetic field at a distance 2.5 m from a 1uc.f, dm;+ngm00-W light bulbgdm,nf;.c +m u?

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32#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 15.0-mW laser puts out a narrow beam 2.00 mm in diameter. What is the averag j-,z cjxv163nyr eb7le (rms) value of the electric fyb, -n361 z l7ejvxrcjield?

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33#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 15.0-mW laser puts out a narrow beam 2.00 mm in diameter. What is the ave8-8mkt ogj4b :5qxl:no * bg1d)eorltrage (rms) v l g8bdmxl1e: *r4o5 )8oo-:tnbtgkjqalue of the magnetic field?

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34#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  How much energy is transported across 2bwu,lyk8i ,cae*c.wp(wo3u a $1.00 \; cm^{2}$ area per hour by an EM wave whose electric field has an rms strength of 21.5 V/m?

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35#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Estimate the average power ou8d+; tj5j 9u *(mqdwqkn2h ywrtput of the Sun, given that about $1350 \; W/m^{2}$ reaches the upper atmosphere of the Earth. The distance from the Sun to the Earth is $1.5 \times 10^{11} \; m$.

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