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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 fojh1h5 au*6 dulr all 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 is proz95d do 3pn5z2 c15/ hrcnll2x4 zd-aftg s/koduced 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 wicqs*c m5iuc2:czh ) .gll 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-wbfjq5;c )vz)uwbz 60ya(vcps) j 9x 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 electromag;,xr u5,w/dfivi bb/r netic waves

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6#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Electromagnetic waves w+*q8:6cyscylz 2h tfcan 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 electrd3+ayl8dp guf5egq-: 7+b o qaic and magnetic fields in the radiation field are+gy : d3g7oa fbl+8qqdeu -5pa found 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 thekmyg/r ki8 ,;e east. At one instant at a given point it/ki8e ,k g;rmys $E$ 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 strapdvk)u7 p55(,jsl j qt f4zsm5ight wire antenna that is oriented vertically. What should be thetvljkd(fj 5s 5s47mpu5zpq) , orientation 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 waves arepotolm f+dr.* 0gv) +t

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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 (p)xg9fwbj(o+jxl+o ol9rz2 t 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 wavej mp)k;meu* 6 5hezj e6+2ekvilength 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 electromagnetzxhk f4:1 ll6 ei)oq,fic wave transports per unit time per unit area is thei4:o f z)lq1 ,fekhx6l

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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 callefu7zy4 jv clhg.-vho /fi1+(ld 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*q0;m.5u/dufcwlk mn q)(dlhmkj4 p 4 lists electromagnetic waves in order from longest to sho/0jm ) 4*kuwdlu.lnd f;h5 q(kqmcm4 prtest 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 ymq 9e11n:dpj11dkli5b f)lk of 2.0 V/m, what is the peak value of the magne91 lfdbqkp15n) j ikem1d: l1ytic 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 wazt/ 6grdy)yeqqf rs:;/r 9n; *jj oxw+ves 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 r */ 6sqriczm(vadio 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 trans6qt4i zx v+er.mitted at a frequency of 7.2 r.xi qv+ 46tzeMHz?

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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 stat+t ,ehu gjj7z,ion 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 ;yzxkdw1p.2dmm 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 travel i8iffdl a1azrw5+,y3 v n 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 1.0 ry l 0v.uib/1om?

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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 ty44b;bhsc u0 w- -b dxa3ykxh9he signal from 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 (d ;gp5+u d8 amazdehc 6ld19udistance light 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 transmitted pulse return as an ech90m mt++s myhpo in 20 ms after transmission. How fy+ hm tpmm+s09ar 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 atmosphere) at a rate of abp xs(z /ss28s0tg*y-ukpb5(jdsk vs 4out / t zs25 ppxsgs8(djuv -syb(k*40kss$1350 \; W/m^{2}$. 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 gmg(g /mecm1 m e 7mr-so3ek t2rgp1*4-to yf3the Earth (above the atmosphere) at a rate of about1p2 om1 gr/ -3msg fm-3 (ygttgrm7ee4o*e kmc $1350 \; W/m^{2}$. 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 valu;75yoq8lsv)h t drk0c4 1ly sbe of the electric field at a distance 2.5 m from a 100-W l sl;y7)k4t8 rqd51voly 0h bcsight 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 2.1sedtuq)c9 3v 1e0b jk5 m from a 100-W 1e)jduqk eb9v130cst light 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 aver/5s6yz4 lxw,v2dtt vz age (rms) value of txvt4t,y zs5d/lvw6 z2he 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 2l3 s9tmm;klg,e r(g(v .00 mm in diameter. What is the average (rms) value omv(kt , ge ;mslrl9g(3f 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 acrossgl9c3,q (n;y o/ gv4m*jnp cwakiwt.+ 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, wn: 2kruahc 08i0mx0cgiven 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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