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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 gz0.zo8cj vot kf5v/a6hu2, tall electromagnetism 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 ism, x6w9umy.,z3grcm x 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 wu1 xetmm49 4y (;lwndv9hjz- aill 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 :0 l 2vw1zsaf o/0lenz s6fsm9waves travel 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 velocity of all electrysy *lognm:/ 0c3ycbe9/ x i4fomagnetic waves

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6#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Electromagnetic waves c0w o/uf3ge tu2an 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 fm jgt7b7i 3.7ivei7yh ields in the radiation field are found to decreas37j htiy. 77b igime7ve 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 traveli4yrnt(:3 +jyw o-fyejng to the east. At one instant at a given point it(:3oj-w+ y 4j rtnfeyys $E$ 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 wb9)d/eh;a t uc:fm +gke9-d6ras q1fo ave is radiated by a straight wire antenna that is oriented vertically. What should be the orientation of a straight wire receiving antenna? It should be;e:as frdc o 1qet hm)/ga9 +uf9-d6kb placed

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11#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Electromagnetic waves wbp2 1ime:qug,g(+ e105dg ipabe (puare

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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 no + d(e;6xoiriet 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 ap vx,n 1kw*c*lb.cu4from

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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 tran2412hf*m8md rc db nwisports per unit time per unit area is the2*1dfwc2dm h 4 8bminr

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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 cal)spmj 981uhs (h atch5led 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 electromag(93* ae(ki ywav gzh7h(pt vu2netic waves in order from longest( 3 (aeg27 wz(pavukvh h9t*iy to shortest 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 has a peak value of 2.04)y;2zoj8/n .zkt fdopmo d(:xxxy :x V/m, what is the peak value of t2yo o4 z ft.;):dj:p/ xo8 xxznxd(mkyhe 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;1hf6 wxp( v((sw +nl jg7fsxk 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 o87 5yymrxtp ,kf 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 transmitted at a fre 5bj 67trcmklrt-+a;u quency of 7.2 6 5j +7mcr;arbl-uttkMHz?

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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 wave in the stati it-5 ug0ek 1apb3ocg(on 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 frequencygp 1pe z mtw.1ns6p;3h of 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 trav72tqu/l3v:h9s a hgilel in 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 take light to travel 1.cx:9i mem3s z: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 fr3i*p2mkroq 5su v/e9kom 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 uwz4/xd0i w:ilight 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 trat 0(,oacr 7ipcnsmitted pulse return as an echo in 20 ms after transmiarpcit c,o(07ssion. 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 (abctg.h81)wg evove the atmosphere) at a rate of about w8 gh1gt cv)e.$1350 \; W/m^{2}$. 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 revkb8.qxtjfw h3(9 mj9v de a0.aches the Earth (above the atmosphere) at a rate of about k.h(b. vjfvxd eaj09w3mt8 q9$1350 \; W/m^{2}$. 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 ;*wt )csi41z8hsws mafrom a 100-W light wit8)4zssc; 1h*asmw 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 100- dzkxbdd;y0yw5/p ng 6efo33 ,W lixkoyn3pb5 d d ef/0d 3,gw;6zyght 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 2.00 mm in diameter. Wkg-x6x (2dwdr p 1kbvp;g5fc5hat is the average (rms) value of the electric fk r6p dxfkc1 v5b;2wx (5pdg-gield?

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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 3-kdnb 3ea od3x c-gx-the average (rms) value of thcx3e a3kb3-odn g--x de 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 trafvkqng+(ws/ho jm w)j l 6 e2ue2a:59znsported 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 a2a9j; k,czfv 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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