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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 deve6uti ho8h xw0/loped 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 prod9 p tfo2q oavqe;::hz9uced 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 f0+xqvd2.xna 90y sw;/diou gf ield will 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 waves48.nu1ja ut-mu ca p6v 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 electromagnet w/-bagd).,eab pqy1/cxx3o0y) tzbsic 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 trlj;2qkh iw1v 2m rkxb3mz,cmqn-06l +avel 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 elec61 q6vceufae r0es 90jtric and magnetic fields in the radiation field are found to decrease with distance r 0s af 1eecq6e0u9jv6as

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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 easty2dq8nnts+ms. c d,h 3. At one instant at a given point q s +c,3d2ymts8nhdn .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 radiaeo /0 wlh(p/jzted by a straight wire antenna that is oriented vertically. What should be the orientatioe0hp/zo/w l (jn 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 wave6owg4varf,0/ n n vz9qs 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 elecv8-/ lzvk/rn kzwn47otromagnetic 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 wavelengz4uclo+ygfo /-nm ,a(d 0eir 0th 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 timeb8*bsae9+14dqssy,o 7 7fg zs 2kwpv o per unit area is the2d q7eoavsyo4* bswb78+ p ,szgfs9 1k

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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 ee+ +td yq96mhwave 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 from longeyr to6 l7n41cyst to shortest wavelenyy 41nlc7t r6ogth?

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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, what is the )+x.xs jl8 k joje7v.uhg9:i tpeak valueo hk g)i 7+tex:jj.j8.lv9xsu 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 th,x5dz1wdrza)6 nmbg-+66 p scyv- fkieir 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 tbn k0 nxz(0/c92.9-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 ri*1cxp typ )zj0ew.;/oyk,spm 8 tr8b01ku hwave signal transmitted at a frequency of 7.2 u,b;mh8pwty*1xc sr p0 to) 0irjz /1ky.pek8MHz?

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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 inx ura,abcyx4p.l,7x+ 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 20 mm ( 2fz1)auxwwwb5 k/ksr/mb.hmicrowaves?

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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 travel41* ;s(ap ty)n +ae k/hdfawxh1sn*vl 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 tpz 3tw3uik*d h 2pz 8b*bv*r+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 the signal from a local radio station to trave1x-n8eoov )tl (krap3*ov s a-l 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 a yeaw mac u:l e.8xde9opby/9z2,l r)?

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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 transmitteq f9/4ljpuz 2ed pulse return as an echo in 20 ms after transmisqj4e2 z lp9fu/sion. How far 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 dhe ev .;gk6 eonc)omz;.p**xatmosphere) at a rate of aboxho;*.k gompevn.eec);*dz 6 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 atmospherey w47m4w fz1hr) at a rate of about y41mhf74w zwr$1350 \; W/m^{2}$. 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 distance 2.5 m from4okl0b9ur 2+5u sezrq2)6pq4yh n od m a 100-W lighth+zq nr q9 dobp2ul0soumer)2y4645k 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 oti)o6 +0koyw df the magnetic field at a distance 2.5 m from a 100-W light bulbok )0+tiyw 6do?

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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 average,hotm 7 yq9(hwljt,l ; (rms) value of th7,t ,9(ht ;hmyqolljwe 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 isgk/l zoismo(u7f+si.hj / 81m the average (rmsooz8m isshf/j+.(/l k 7im ug1) value 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 ac0*ox8h87n 7e gi9nki xo ;f u-uhmp.vyross 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 Su d* v9r f7kinudmy+)v:*egz:fn, 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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