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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 werfctw4ygww * no ;qp90c.c. ;uze 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 pr 5nl pc sbec.n/2)hv:k1omr 7koduced 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 pro z k48l+qpy4racopj9 (4yb 7wtduce 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 vacul z9 9;fpd)sncmg (ro9um 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 allvd9m.xp8sz7 /b-hg p gl-)rsy 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 ,(4v5 n,stcny4z mahvtravel 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 ink 7pf nge.c/ryf*-6 se the radiation field are found to decrease with distance a c6g 7s*-.ref nfyekp/s

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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 travelict.24 wce rpf/ng to the east. At one instant at a given poi2 tp/erc.cf w4nt 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 b,:lj 6t cqrzf*7uw3gby a straight wire antenna that is oriented vertically. What should be the orientation of a straight wire receiving antenna? It sho z:j76lruwb3 gfc, qt*uld 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 a;cl6agh1i )wae ig; anh **0emre

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12#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Of the following, whic ;l7i8q0 itttk,hla6* tkpn2jh is 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 :syj9h33u1;4mh ye8/hj0m s ayi gfmy 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 electromabwxy23k.dz6rl.xx / ygnetic wave transports per unit time per unit area is thex2k xwz3ryx/dl. .b6y

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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 yapl u;3263o c*x2 agbk4hfhe 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 followietpt ry*/4j 3a p0hlbg5q.(rm 8ldjg)ng correctly lists electromagnetic waves in order from longest to shortest wavelength?r.*0q) e/pjrlg3tj a db54pylm8tgh (

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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/qlt6)* zjmx h9m, what is the peak value of the ma6 *jmlzq)xth9 gnetic 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 frequency ep o)3ce dpg7+iz+n-gz t2 1ygis $5.0 \times 10^{14} \; Hz$?

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19#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the waveleng m:yc *egcz21lowsg un f7t6)9th of 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 12;82;jmqdp)f q q)tftjfbub a frequency of 7.2 jf)) b ;bd1uqqqp;8f2jtf mt2MHz?

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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 statzav.jwvz6ut q8vyzy 7: jizsi97q+6)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 m,fh+ (qypksd9. ;t v*ryhgb3 +3rjmonm 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 tr eqyb y,/itm(rqvqds263ty/i;, gan sj*-l:davel 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 1cz12 d06xe3 jfmmgx6b.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 (vu nw8bfcw ec .5:9mhi*cyo6local 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 distaa2qn 5b6ypp u0nce 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 pulshwo.(8hw1a+wl/ eufi e return as an echo in 20 ms after transmission. How far away is the reflecting object?.1u(/ h+wiweolf8w ha

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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 reache q;ooy 1ve9j4(s xap7vs the Earth (above the atmosphere) at a rate of abov;(ojo e49q y7vpas1x ut $1350 \; W/m^{2}$. 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 reacgg-3 k qfxus)o2l rf586n8hcrhes the Earth (above the atmosphere) at a rate of about6 5 k328g-hr nu)loqg8fscfxr $1350 \; W/m^{2}$. 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 distxmqr 0 vc6s(,fance 2.5 m from a 100-W lightxms ,c(r6vf0q 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 fromg p6wlpy0su)q775e ue a 100-W light uweqpys 7ge 5u70lp )6bulb?

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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(2*er0iev8u icl9io w. What is the average*i voc rw2u098e eii(l (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 bej2d cnzoag3ziv60y -2m l,l+ o.c /ulyam 2.00 mm in diameter. What is the average (rms) valuea.l2yoc/ulz6zn+ ijy-vl0od 2c gm3, 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 l3xlq 0l0yl1q*t q ;/kcrh qg/s od3(facross 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 w3( f m*agg4tvp3pgk4the 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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