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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 develoycj:;vb l4cpb 3o4*r rped 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 ist x.8p4za /wty produced 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 0qziltncyad; h7xd p-:6dp:, 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*o:e1ktc/q pqn k+*kj 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 velocity of allo11j luzm.af;b p+vo (b6 bn7-.xfy fe 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 travel thr-zen04: roeos(of g+ xough

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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 fic( +v4nncw8 lcelds in the radiation field are found to+nv8c( l4cwn c decrease 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 travewh+/g4 v21rljpe4 tqx5hxc t+b6gya+ling to the east. At one instant at a given poibyew4qxh25+g/at4j v++t6cpr l1hgxnt its $E$ 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 ante i-qw44 9uq:0xd*vxt mxn2 njcnna that is oriented vertically. What should be the orientation of a straight wire receiving antennacjitn *x0mu4n92 x-v wdq:x q4? 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 are5;s- h mn( ptmbhf(dz0

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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 is not electromagne 3549 sch sn;(w u5gsj8kzvqrutic 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 ylh6zyi/6qs* in wavelength 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 f7rr8gqu i f-8transports per unit time per unit area is the -78ifrq f8urg

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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 ele. ) ldjp7meocl +mq;,kctromagnetic 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 followingk mwnq ie2+ + sd-s2plgu16h2n correctly lists electromagnetic waves in order from longest to short2 2s+g hp1qnneu 2s-m+iklw6d est 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 fielvo+s ds2 *ww-xd in an EM wave has a peak value of 2.0 V/m, what is the peak value of the magneti+d-*sx 2wswo vc 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 thpthzh5*u 6h(pkrxxc2 ,3ld i(vfr1 l6 eir 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 of a 92.9-MHz radlre(pn)db7e6i)* yq wio 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 frequenctrl w +mx5z- n;drac.3y of 7.2 MHznlc -mrd 3x at5.;wr+z?

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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 fjlo9n - ha0ms,or 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 20 mm microwaves j ke /(s(whs6rb: ms0,f;efep?

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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 mnc5 x6)vjs4*1 pbsdgh s?

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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 takufliniul/esl -o1u 2/k7gg 94e 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 local radio station to triair ke133 z/ zlcor -n1whtvf3q432k avel 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 lig,djkh/lfty :m-y7( zqht 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 indicatesr 9 hh (-v86kpk*kqlyn that a transmitted pulse return as an echo in 20 ms after transmission. How far awl6 hk(n qk yk8r-9*phvay 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 atmos bedfk5z , l ft5os9fi712k;hlphere) at a rate of about5,f9b k715ehs 2 dofl itk;lzf $1350 \; W/m^{2}$. 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 atm kzdw0m* vc.sqb5 ;qgt8cg 8v+osphere) at a rate of aboutwcd*v8+qq.58cggvz 0bstkm; $1350 \; W/m^{2}$. 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 field at a distance 2.5 m from a 103p+fkb z uof3 j/6gg-u0-W jku3/ fg gufb 63oz+-plight 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 fro.xbe.l/4.vt b yh mm1qm a 100-W li..lvb./1mx he ybmqt4ght 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 ouj)ga1zh6l 0pyt a narrow beam 2.00 mm in diameter. What is the average (rms) value of the ) phy 0z6glja1electric 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. What is the averassy6h()c a*r jnil,h1ge (rms) valuejcsy, ( irh1*s6ah)ln 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 transportbs51k z qtjgw4n1dp /9ed 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 ot+ij37 dcwnk/f 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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