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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 developed by.3(p;q hjnef(py0 ept

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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 produnvz8+bsm ,+d7m ruo 2qced 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 produce v1hil9jheia 0 73jl .zv j( -ifndke09a

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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 th/n tm1zd; 0kw-m yffq;;3 wqhzrough 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 xm, p04izsr v:electromagnetic waves

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6#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Electromagnetic waveshjytf.t2zm: x3*bt8t*s yk i+ can 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 electric a9ky,wzd )hp-2 hdaf3 dnd magnetic fields in the radiation field are found to decrehh2f wzy d-d9ap3 ,)dkase 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 tr/71f mhica vleo840ilaveling to the east. At one instant at a given point iifle ovmc1i h/a04l7 8ts $E$ 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 oriented brsiyql 35v (3vertically. What should be tv i5qsybl(3 3rhe 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 wavewuv t:4 0(gdl6gdg,cus 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 not electromagnetic in na6 70kor0x pype/rp2cxz i ;;pcture?

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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 wavelupm21gasws3/ ength 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 electri .g,c/wx)ajw z** kgeomagnetic wave transports per unit time per unit area is thexwg ij*,.g/cwkz)a*e

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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 b bbs1+mo;k+hzy 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 following correctly lists electromagnetic waves in order f o.,j xh+p, +i5ncwgowrom longest to shorto5.c wjigpx ow,+ +h,nest 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 of 2.0 V/m, wbx1y nq;6p(a9c xf/wuj oou 85hat is the peakuxqn /(ayf o;pju61wc oxb958 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 light waves if t :qgzzu n1;q,mheir 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 wavelengn1e9 a q1wm8,,lfymo cth 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 a frequlo x ;kig1o9-lency of 7.2 MHz - ;9oglokxi1l?

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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 carriv :4v ma1v;bbver 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 frequency of npg8 hufmt-v/igi:x4 c +puul l829-x20 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 tc fs pr, 8;/dcj+a h0*dfyw++iw:hjdzravel 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 ligu*jt:px /ovnq qx ;hbc5a-hxu i6m. 0(ht to travel 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 thsyd7 ws7l/9dce 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 distance light travels in p8-o e9:c,lai yz .seaa 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 retu,gy g1b 9cy)a,s3bgmjm(r)h wrn as an echo in 20 ms after transmission. How far away is the refmbgmgyhs g1rj)cyb3(,a) w,9lecting 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 apm .(c gif*vyhyth5w1cc o c4 d*k)nh98wf/1oboytg.5v(hfc 84c9 ok1 dic c1h*wmw*y)nhp fo/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 reaches the Earth (above the atmospu.qb3hr4/ y p g(:pen4wr9ptohere) at a rate of abou.3bgeup/:r h44pqtyo rn 9( wpt $1350 \; W/m^{2}$. 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 electricfrss5qjmr wz6kg 3s;z o:6x88 field at a distance 2.5 m from a 100-W light bu68f8s56r xwksoz gj;3 :r msqzlb?

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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 frvlvo y;/dk;,j om a 100-W light buv l/j;yd;,vk olb?

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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 nax 4o- yw8mi2h b*oi8m**jtbgn rrow beam 2.00 mm in diameter. What is the average (rms) value of the electric fi8bi* tbog2m 4xiojnw *y- 8hm*eld?

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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 ouq4/ )vigdfr +1yl5t zwt a narrow beam 2.00 mm in diameter. What is the average (rms) value 4 )qrdigylvwf /5tz+1of 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 a+m lg .,pz0s.3outl.v9tit rkcross 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 outrr*fwi (izj7c3 9t g2+q6ebbnput 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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