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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 electromagneti jiv,umo;/5u 9mzl0 2+earfdwsm 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 l3;s8 rgqu3imxnp2mwo*df7-f b05cv 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 wilxiqdbf g:a 6987w79kqxpisg8fu7nz.l 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 throu;l14tz6d- 4e sgbm.niwq+ks fgh 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 allv7nxxswvvf+y4iy6 z r a4:.m ) 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 travel throug s/ .qq r d:wx o:wn5x4qte,cl(1g-melh

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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 n2 ,mo)aawm;k r xah1w. sba1;field are found to decrea ;wk12or1,a)sn ;axa. abm hwmse 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 wah vrc* . 5lp+oyq,yl5dx +yl9kve is traveling to the east. At one instant at a given point its,k5 ydh+y*pl y olxl+qv c59.r $E$ 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 thb3vyfpgf50/+aue * fb at is oriented vertically. What should be the orientation of a straight wire receiving antenna? It should be place*u5p/b03 fef ygfab+ vd

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11#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Electromagnetic wave 9fgh6krw:71rkvd s o,s 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 d(sky0* qon) fnot 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 wc ovdf9dc(c9ch 0eaf nt1e59 1avelength 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 wave transports per unit time pern3w+ aqjdzv2hr 3l:r1 unit area is then1vh3r: r3law+2j zqd

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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 called th9-nnkeq1p s:ue

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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 electromagnetic waves in order from longe3n:qs7h c g;te*mi6g4 a(sjl dst to shortest wam h6gq3i7s sdl(:a4;ncej*tgvelength?

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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 pea)/zm4+lk4 r r;d h9acfp(gy ukk value of 2.0 V/m, what is the peak vc 4py)4mh rku;9g/d(zal f k+ralue 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 lip g6u:3i wcqh0ght 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-MHz1l65 h r/z0gh 6+:abeudnlt gc 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 .myfrfc;eh+t l/) v d.at a frequency of 7.2 MHz?+vf.; yc/hl.rmted )f

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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 carri- 2d i m57sqvlx7tak,ier 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 frequenc2 jb:qs,qgot:xq( po ;y of 20 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 travel in 1.0 m )+- lbrl fb*adbmqrxk+ +e;z(s?

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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 m? 58i+dbi(feew+ xwx7k

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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 loc3kfb7cswdf vs vblchn/97qb c-. yx91 mj976hal 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 light t) 81.exv fzwnmravels 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 echo in 2s+ipi)+ekv7 ;c1; fdjlciqm n-6lda6 0 ms after transmission. How far away is th-q;+c;6lp7 +i 1 did6knla vemi)jfsce 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 h7 -pwp qapmlle oo0 tkr*52,np0oc75 of abouwq pta5r, nh0p57 e 2olokp*l7pco0m-t $1350 \; W/m^{2}$. 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 Sv 6zv zvn.w-0 gf9fv/zun reaches the Earth (above the atmosphere) at a rate of abovzvvwg60 /n- .fv9zzfut $1350 \; W/m^{2}$. 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 f zw qc --:.6hsmm:tzwhield at a distance 2.5 m from a 100-W ligh.- hm-czws:m wh 6q:tzt 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 from a oiujip6 -1m w.100-W light bul pmoui1 j-w.i6b?

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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,b4gs.r)1qrbdrgtt ljc.7. z a narrow beam 2.00 mm in diameter. What is the average (rms) value of the electric fieldsrqzggbc b.7).1 ,4dtrrtj.l?

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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 narl cewrdi:1;w:a2p -ujrow beam 2.00 mm in diameter. What is the average (rms) v1jr ;w: ic-d euwlp:2aalue 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 actbul i44hzj8 -ols w)6ross 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 th7r.g ,yjhj1gc e 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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