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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 devihum dmazr82ea. ;n,0oc(4 dkeloped 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 pg,n sh*e1gz; broduced 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 prod 0z jbupee7.4ehm u8o/uce 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 vacyco co s8go3 zf2 le*soy7/g3.uum 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 el3*(kgi8q vvx gectromagnetic 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 throuoyfyx;y6 dsyd 2d 422fgh

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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 magzwlge5h .bwf 29hd .b*netic fields in the radiation field are .l bh.2wz g5eb dfh*9wfound to 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 traveling to the east. At one inst+ lk7di-/zrb u-ymr9 +q*hmz jant at a given point itrd/9 il+7r-ujz z*yqkm mb +-hs $E$ 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 antennr)eluia 9elm;) sl d ,+y97ydda that is oriented vertically. What should be the orientation of a straight wire y , lddyrea d;+m)sl)9u 79leireceiving 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 wavewdxzd djb:r,44 t* bf5y+aulk4k).x us 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 isim0-pb+k-jy e 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 wavelengc * 2 bnoy-ua4zwhey zz9zy/7:th 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 wav/ l0nweublyn85mffce 2pvu*i .a-,v 2e transports per unit time per unit area is the.yi2 cuu5ne lavb/p08ln-2mwf , * efv

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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 au,x 9;up mk5q8 dsi atuz-blk90c7a ;gn 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 followingg6c)eqg*m,5z h6de:k8txy teiwm wxff n ))4+ correctly lists electromagnetic waves in order from longest to shortest waveleng5iey4df)6gee q +fhmztgwcnk:8, m6)w t *xx)th?

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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 wavty2h )y6 syn*de has a peak value of 2.0 V/m, what is the peak value of the magneticn) 26yd*yshyt 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 liqu :zhu rf 0mvn860kw)ght 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 of a 92.9-MHz radiws2-hk.o hd.e/s; 63bhf cz i3tj2t+oinavv/o 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 frequency79p gcr-herki9ja xl1-+qhu 5 of 7.2 MHhir7- g1qhe9a+j- x lu pkr5c9z?

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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 i)1ywq g 2h:fi/(hd 7p2b )jycet)yp dwave 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 20az ,j 1qfud))m) )qflk 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 travg3l/1+ue yz ytmz,y +f6:l q;urwzga+el 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 travwi;n6nmo2h,:uuj 8k)vlw y5 gel 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 st8cv v)vs2x6zpqj n(mt4 2vd6gation 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 light travels in a year u5:iei esvwat*)u t(,)?

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27#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A radar receiver indicatdi0lzr nj z+ :0:az rwuol;8o1es that a transmitted pulse return as an echo in 20 ms after transmission. How far away is tjw+1:8nu:dror o 0izl0; lzzahe 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 S(oq 9c*7llwt +.rbktzun reaches the Earth (above the atmosphere) at a rate of about z*q lb( lrw9ktt7.oc+$1350 \; W/m^{2}$. 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 abck y x +9mq6/vpgk;yl)u1xn3hout nyp 1 ;y)xqcv h6m3/9ukklx+g $1350 \; W/m^{2}$. 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 100xzr1,9t )ano,bfcwc- +-bfb k-W light k ,, -)rnoc b+1af-xbtfzc9wbbulb?

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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 sad g7i)jskc 6 x8b3-nfield at a distance 2.5 m from a 100-W lijb gdi- n)kx37sc68saght 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. What is the aveh3z h5cpn1i xla.q, h/rage (rms) value of the el,h3h hinz1. qc5xl/ paectric 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 ij 0/jjn53eej nn diameter. What is the average (rms) value of the magnetic field0n5 j3 n/eejjj?

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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 transportxoly4+80s, odk2k,/jgte (2hz bk tmied 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 ouc t1waz7-i 3y4pwa1oktput 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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