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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 developeeq.lvf)4 :9-.2m 3zmb/zpnyu bildz fd 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 prodhy9e im1vinv;8 x+u 7omohebi0,7t2 suced 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 q*f h6q5n2g m1p ai0uppv+5h rixo/g.field will 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 throg2ozb-ozp ,42 x7x leough 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 velocitx ;,clk)(wx .ykk8e oyy 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 c xnat 4(y3zijkl.pc3z ons,0- an 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 the radiation fie o8a/qepb *xvwp50yk 9ld are found to dec a8p5eoxpk/9q0bwy v *rease 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 in*b u / mocr-slfk*w*ak4 8k4)uzqtov: stant at a given point: bfa r cs-4ooukmk* l4wqv8u*/*) tkz 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 ug ncgf5.vrhe0m( 4f, 16omur straight wire antenna that is oriented vertically. What should be the orientatifrmum(v 5 focru .h 1,e064ggnon of 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 wavesal:i1sl) pbtgbn0 6 o0 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, which is no6 0kbliiu c()fv; d0kht 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 wa3/e rj.spa-ih velength 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 smy 6w5 bb9.b9if,hc .l9norux*s ud9wave transports per unit time per unit area is thesnuburwxd9o f9 6bb ms *i9l .y9.5c,h

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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 a oh ;l+c )lk-/x)lhackrea exerted by an electromagnetic 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 brxt f,,. :upjl 6v+tyelectromagnetic waves in order from longest to shortest l p6.vruxtt,+b:yj ,fwavelength?

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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/m, what is the pea0z0m wg 1zhpw4k value of the mag4m z0pw wz01hgnetic 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 ts:tv8pzikfdx3:o pth8(deo+ v br9,3heir 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 rrqc(bex0fb :+hx6 *s92.9-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 ra,lt f f+2sdux*iu w44ue7(sh ij b7xs-dio wave signal transmitted at a frequency of 7.2 -4x,2 u+s7siiewb hftf( sju4 d7xlu*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 wavelengtnrnoiqni3 (l .,u 4du1h for 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 mbt9it1 sl-(u bicrowaves?

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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 :b)xhnu s9a. zk83mgoin 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 traveleef:dxr k)st1n x)6c6 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 , 5vzi:h l1toktravel 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 light travels inpalh5kna+n 5i2ycy mj u9jdu)-+ym ;7 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 thjngwl;w9+ ek2; m ,lmhat a transmitted pulse return as an echo in 20 ms after transmissilkw ;ml+me9j2w, gnh; on. 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 thg8/)3vyp4 gmkil1f rle atmosphere) at a rate of aboutlg )1fkg4vy8l/3rim p $1350 \; W/m^{2}$. 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 q(xjuyj 79 )aabl;6 wf(above the atmosphere) at a rate of abo();y9jbq lwu6 jxaa7 fut $1350 \; W/m^{2}$. 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 dist5wjt;sgj4tx nf* x2 0iance 2.5 m from a 100-W lig5i jtxxtg2 4fwsn* j;0ht 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 va 3 fy,a0p/ngosz9xq7 elue of the magnetic field at a distance 2.5 m from a 100-W lin zgsx0yq3a/ep7 of9 ,ght 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 2.007bjamd v6bywwg1) xxazv37g a (w:6t7 mm in diameter. What is the average d vxgx(7: tbwyjzv)abw76 mga 1w 6a37(rms) value of 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 2.00s6/wr srgch8s 4v f9e) mm in diameter. What is the average (rm 8rgs/ swf)69ch 4vress) value 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 acr co:urc mnfp-jw6 f2 tux1z6(4oss 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, given t ,fqe-go. (ptyqr1if 2yrb6e/hat 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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