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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 electromagnetism were m- 3zt) bv1utwfqd, 9sdeveloped 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 produbm ht,j,/az ;/h8djzcjjbp*+ ced 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 prbzu7bv/3y ij5 q*g(m( t 2azamoduce 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 travel through a vacuu +v5nw*arfyu0m 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 velocity of all el7c 0lxi pac+bl41 k +v,*ffgvbectromagnetic 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 travel throq es ,2/uxlli2ie.;f eugh

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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 a:9cg-jye4) hco 8tlt7py jw8rpz. u;bnd magnetic fields in the radiation field are found to decj hj ;.ucc)9lybw8tzp 84rpt -e:yog7rease with distance 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 wave is traveling to t(l wemm/z. a):q-jgx ozwmt26he east. At one instant at a given point ia z6mzwt/ e(-)mm:.gx 2lqwoj ts $E$ 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 antenna that is orientew5esd ytdsjsls57+h:,. ./fr 0)mqop nmw:ag d vertically. What should be the orientation of a straight wire receivi0)hpom e/y ml57s.jsatwn q5g: dr+sd.wfs ,:ng 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 are-+8y elm qgu3eku)y+ pi25b hq

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12#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Of the following, which oaab:+(g km/qd/g xx.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 wavelewo+iaw5d ,b1nngth from

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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 transports per unit tiq8jbt c3 d8ri- -vkrfe/z,7 vbme per unit area is thevjekzv ft8-r,r d8 c/q3bb7-i

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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 cafmb 1wa/ o62x;tyioe /lled 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 l cb 8m4f8lwu b.wv5zk*qf1yt8ists electromagnetic waves in order from longest to shortkq1z*ftu8m54wly b v 8w.f b8cest wavelength?

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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 in an EM wave ha2vix rv*)n 5wxs a peak value of 2.0 V/m, what is the peak value of the 2wri5x*x)nv v 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 li gxof (oq ,cgz ;e88so;q+9hpxght waves if their frequency 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 of71j4t3zs ggwo a 92.9-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 iu*d ., zt7y1:qt2eno rn +e5)hvpgfytransmitted at a frequency of 7.2 fdry 52eu +ty1gi,7 )nz.v p tqon*he:MHz?

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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 for the carrier )33zmsarh9 dgz(e w 9ywave 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 20t-gt;9* t rq./d vfo pjdz8o5if ys1n3 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)). oh-a.pmeto wd:u u ms?

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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 light to i ,0w , m)-flyshnw8nhtravel 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 sigoj hopt .8sa(h k9 v()gxw)e/wnal from 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 (the distance l6r0rv asm,e. tjb)t0uight 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 pulse return as aumzkdq+ 6c6 bw 9-.dxl 0:qxjan echo in 20 ms after transmission. How far away is :lzm kwjdaxxcdb 96qq+u .-06 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 ab96tt*fol b5 ; l+/vs(jbxdlvuouv 6+l b9fstjt (ub/;v5dl*xolt $1350 \; W/m^{2}$. 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 reachem oy,ki p7.bdj(nrtbs6t 7o5 9s the Earth (above the atmosphere) at a rate of about(id7bpt,oot s7m b95yr6 nj.k $1350 \; W/m^{2}$. 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 electr;33fh ae vluu3x am1cbyyj3)9ic field at a distance 2.5 m from a 100-W ligh39myufjuh b 3e3yl; ca3 avx)1t 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 valuecsttgq rp ,ue+ x. *;h1w6xykp cv3p03 of the magnetic field at a distance 2.5 m from a 100-W lightrcu 1;t 3x+h.tsxc3v6*w0,y pkpp egq bulb?

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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 2k++v q2 7vm hczmta;w(.00 mm in diameter. What is the average (rms) value ofa tmv2cw;mv7(kqzh ++ the electric field?

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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. Wc-l b;z3;psxz hat is the average (rms) value l;s;pz3b- zcx 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 transp e:vo+ ;to.xapfgk ))h*tzcr *3rhj4horted across 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 output of the ffwm5* a 3,8wl tudok:i. 7hhiSun, 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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