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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 electromagnetisskhb s *)x,,gfm 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 qd,brhkj *g8, 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 will pis8o d -ac4yk;roduce 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 througvvg-t* 2;rlx//ysc aah 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 electromq1v cqkv773g oagnetic 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 tru(ek s50ai 3ot vp1gr1avel 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,- w. 5fhq 0)mwgphxxm the radiation field are found to decrease with distance as0h 5pwwfm).qgh ,-xxm

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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 instant at a eymanx7 5)wj.gv,p d( given poiny7apgv.mj d nw)e(x,5 t 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 straight wire antenna that is orientbg /yd05 pvb:i /ps9wjed vertically. b /9wp0ygd:i5/vj psbWhat should be the 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 gd5;3.rsexj) 5mrov bare

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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 not electromagnetic in nvuk:upz .+l0 yi 1o9bwature?

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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 wavew o)nikh lu a7g02sqf9.,6eb ylength 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 waj4z tz1hcp sapr6h2qxq80(u4h/t( vove transports per unit time per unit area is the qr ph4j1az(t6ct(u /z4sqo02v8pxhh

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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 electromagnetb,3b mavm i7;c.ey p+xva.e *hic 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 followin/ t 1q0w+c( onfotkp-xg correctly lists electromagnetic waves in order from longest to shortest wavele1(- /tfwnpcot+q 0xok ngth?

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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 28tlvb( ;4fyd(0el- ju bu glba peak value of 2.0 V/m, what is the peakubu((ylg 2fel08tbvdlj;4 - b value of the 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 lig.xbvp:in8,0i x*lq cy ht 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 u tstp06yf;w6t0m 4qx 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 wvyd 337mpqi c vd9yz.7ave signal transmitted at a frequency of 7.2 MHz3y c3 7.pqddivv7 z9my?

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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 station WBRN 146i r v-x( 3kfc,alzz7,r0?

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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 mbuht9(y9r 3xat8pf;qxfi6n *icrowaves?

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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 in 1.059 e je:cr5jk7f+bbgx 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 trave9hbw* /k9dlrz dlb++f l 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 bzq(q5b -wse;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 li2j) g j3wo6pr 1k;p8g lxpchlb3 7t pj0vt7so4ght 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 indicaxm(f2q30o6 zjss udban1sx96 tes that a transmitted pulse return as an echo in 20 ms after transmission. How far awayufs qx6zm 9aj3sbdn0 sx1(62 o 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 )z0;dqzlfpi1e7xt, p,vy*u e the atmosphere) at a rate of abo z t)eizfd1qxpe7;*p0,,ul yvut $1350 \; W/m^{2}$. 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 atmospher;5jz - vc 6c-o-hg+qyq)dez ,xsloe- mic1jn-e) at a rate of abou5jez ,o-he)qmx +nvo-- sdzc6lji c1 g cq;-y-t $1350 \; W/m^{2}$. 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 dm o/;1e ,vn55 ieydetat a distance 2.5 m from a 100-W light bulb?d;ent51e ey/o,vid 5m

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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 magnee)qg.nfzfz*o*8s)pgx7 wn * tphr/a9 tic field at a distance 2.5 m from a 100-W liah*p. *goz q9 8 w)rpf*tgnesn)7xz/ fght 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 narr+o3mph)oa( i gow beam 2.00 mm in diameter. What is the average (rms) vapoo +3( )ihgamlue 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 2.00 mm in diameter. What is the ave vpyelzo/1-.0ffiz 5irage (rms) value of the magneticiozevif0fy p-l ./15 z 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 across azj 7l6lnd2w9gai)1 wk $1.00 \; cm^{2}$ 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, giveh yhvl;mxbeyq1xnc999r8 q8 *n 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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