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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 electromagn no 6ehqjo4uy2,.abp.etism 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 produced ( ;7tzn;t+n cjop 4ktrby 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 willa7 2uuw.1i0v 1wl;hi/phvvse 6w rji: produce 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 ah2axb;pw,3p ; p,mfcs 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 velocity dfp,x9 gd9o9yof 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**pof4qj /ol *-9mh4jcc 0kmdqw. wyb can 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 magnetic fields in t adoh;l2m 2m*ffj/ b:lhe radiation field are found to decrjbdlmf*2 2f / alh;o:mease 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 the east. At one ins3dio7 36b;cds0 js onz(0am91anfq7yy)s pi gtant at a given point idnosyqjf7; mi1)ndais b3cs a67g(z39p 0 oy0ts $E$ 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 radiatov3n cl4.a+ lwed by a straight wire antenna that is oriented vertically. What should be the orientation of a straight wire receiving antenna? Itvw3o+nla .4lc 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 1s,cjcm5e ef- r*j0db 1q7rcpare

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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 i )3ds /x6;krdbd wn4oos 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 wa,m gs, nsl/ci( b.zbe7eu8n kfy 7jv+8velength 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 time per hq -q0lm jnu91 uf;0zchve 96hunit area is the f1mj;9zhh6 vuq0 he 0qluc9-n

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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 3,) buc nibbpok-+.df wave is called 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 waves in ordeg i.xe)gvaewa 3 7r93lr from longest to shortest wax v.9w7g3e aeglria3 )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 in an EM wave has a peak value of 2.0 V/m2n )v wy61wg/e i6ak3h ypo9-a1pkztt, what is the peak value of the magnetic fh2z1y ak tkw6v a3gt/y9-p )w6op1nieield?

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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 frequer/ 97g2pe xfsxncy 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 wor p m0zw +8(qjbca2vei6 a9+iwq-xg90 q /hfof 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 transm :,a3qdz gjzk73 nxh xrz07lr;itted at a frequency of 7.2 MHzazk x:z z0;,3g l3rnjx7q7drh?

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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 carrierj+2 ibk+zxqc: 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 20 mm micro.z .ah3m2oinn(y j:mewaves?

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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 hkn z.3dt4i tm,8h/ dmin 1.0 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 takc e:45bnfnou5y 1ylcg r2s*s9e light 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 from a l ::kkfn xp i2.+ kij:g0twsg8oocal 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 ligtyyk )h)ti;e.t .l/g 5zc/ erydfeo4f;*pi h4ht 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 thaen :w)9 y-rlg c mm/7hhtsa;.kw q:suam1:io*t a transmitted pulse return as an echo in 20 ms after transmissi gu; aw7a h:m/)*w:m1o9snkcr:yqshe- .li mton. 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 atf/ao) 5:y3zfzvm a9ab mosphere) at a rate of aboutyao)9 5b vaam:3fzzf/ $1350 \; W/m^{2}$. 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 gm c a:33nuthhl0)mh8ub0xc *abo*00ht8 mag uc3: xblu3)mnh hcut $1350 \; W/m^{2}$. 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 ofer)a0v vvu op 4r3 /1kk./kwvh the electric field at a distance 2.5 m from a 100-W lig3r rv/ .pvkvoe)aw1kh4ku0/ vht 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 diu3bue z6.-8rar ets) ustance 2.5 m from a 100-W light b -es.8u )rzuea 6brtu3ulb?

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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. Wpk ;g 9jbg4wpg.xpnj0 6, mvx,hat is the average (rms) value of the ,,xgj; .gg 4xmvjw9pp p0k6bnelectric 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 i fxfxa0)cl+( *jbjx;pn diameter. What is the average (rms) value of the magnetic fieldp(ax0+xj* bclx) ffj;?

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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 traxplk*1 *:p3 295tujkflvoak hnsported 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 Sun, give b*72rgdt mnf v7j3goe-*6h wry/l5kun 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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