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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 developl+kd6/vl*k kp ed 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 prodi 9kjf-)/gpjt uced 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 :aj8wb,nei7/cm1 sywu/nn : hwill 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 through a vmz4,c( skge p9acuum 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 electl1uz+8mxbk t(m o1k d9romagnetic waves

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6#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Electromagnetic waves c,ux drghic,xe e. +28a8 eny32sah1 iban 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 and magnetic fields in the radiat mmt4n81tmuo+ 19gy w 7m:habtion field are found to decrease withm h tb1+ 4m7:anw mg98ttoyu1m 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 traveling to the east. At one instantaf 7skf.dd :d1 at a given point its .d 1df dkaf:7s$E$ 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 str-l ouru8c0 r,saight wire antenna that is oriented vertically. What should be the orientation of a straight wire r sclo-r,0u8u 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 waves2;m :9er gfqab :,megxy,f4zc 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 is4hofsv 89sze , 9s28i8vp shos 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 in wy1m85gseiab k, s;a6 havelength 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 per unit aqaj-rsry;v uldh4/v eqf4fx6dv9qb a/z2 6 95rea is theaeq r9f6q 5lu/rav462f;z hxdbsq -dv4 /j9y v

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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 7x lu(k-u*inr 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 electromagnet,jm95huqw c/*9*tk tsrhr p/x+f mr ,sic waves in order from longest to short +mwrxpkc ,mt h/9s 5/jqurf sr9**t,hest 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 oq6sl/kx jr9 ci/44q kqf 2.0 V/m, what is the peak value of the mc /ir9k/j q4s6 x4lqqkagnetic 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 frequencyz+qv0d0 xt 9ut 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 ymrgt11r)qq gw6v( v+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)yc9e y9dn/qx of a radio wave signal transmitted at a frequency of 7.2 MHz? /xny)ecdy q99

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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 tdkqq6 7:zh i6poo -ar+g*pb ga*c11e1460?

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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 micr3ylgm/puzdaxs -)r 7 /owaves?

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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 itx cy, zf4 g9k7z9i)bbn 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 :gxj 9zgr zq6*om7ad81.0 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 travel 20(9mn 1clxwq6 b 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 tr-(d z6 w9/rqb*nxa2wu sxlu )gu9w0c iavels 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 retur :x-seqjck9z)s qg1h0.p v d;xsci.0q n as an echo in 20 ms a1ikzj0 pesq. q9.:dqxs c0shvxc;- ) gfter transmission. 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 atmosphere) at a rate o;h+hk se m-3acf about 3s +h c;-hemka$1350 \; W/m^{2}$. 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 Sk ,,ys8p+ fobhun reaches the Earth (above the atmosphere) at a rate of aboutp o8,b+ hkysf, $1350 \; W/m^{2}$. 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 dis/z 8bv 2syai uti(oz+ +s(w8).tn.nosefx(kq tance 2.5 m from a 100-W light bulbnsa s(xy(. o8itibez+f 8o(.ntw/zvq us)+2 k?

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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 fieldo2g *jw/dn69fvh4is3c j:rjv at a distance 2.5 m from a 100-W lightj*ihv/ 32gj: r 9wvf ncsj4o6d 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 narrow beam 2.00 mm in diz poi)4 4vmyp3te 7o(krf /h7oameter. What is the average (rms) value of the electrmo rhye (o ot 47p3kz)i4vp7f/ic 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 s -93ql ii*bnzr-h*jn2.00 mm in diameter. What is the average (rms) value of the magnetic fields nb*3hnjizlr -qi- *9?

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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 +:(tf2qe amtu q,w-oqacross 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 Sun, gi;*14.vaop p(u .tm2 jizadcmw ven 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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