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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 for8ycotbtxhv, s -t ptn 3*i,05w all electromagnetism 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 2pct8; bq zyp: 53bfm bww;,heproduced 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 fb)0-d tqc8zmbield 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 waves travel through a vacuur 1t72hel*v pyu6x n.fm 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 electromagnetic 0;fqxtys 7vz da /-s, nhb3rg)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 tb11 0uikboy* hhrough

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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 w.ztwb2/6afo /h;qs vthe electric and magnetic fields in the radiation field are found to dec2qtfao b/w/ 6. wh;svzrease 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 travelinz: 1ta3k5f vw )7levokg to the east. At one instant at a given point7)ke 5av:of3 w1zkv lt 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 radiatffpv q g:-6,g1vu(:tm1 wdzbfed by a straight wire antenna that is oriented vertically. What shzbvq1( wtvu:d6g pf -mf:,1fgould 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 arexl7m3cbee ;:w

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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 electromu5,v,kmtabt ) agnetic 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 wavelengthy:if ,m 4gca9zhb-tv) 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 a/ 8fniprj5h0,2xd kw -blc)zo rea is thehzdp /nj)-b5lrk o8f2x0 c ,wi

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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 exertedsab (jwx.vvo 1v,:l)p by 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 electromahv7us6d8 qc82,q yp8 zicj(x xgnetic waves in order from longest to shortest wavelengt,8hs 8 pi ud8jvzc6 xq7y2xq(ch?

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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/f4gwp ob7rd gfjw,17 /m, what is the peak valw f4 gf7/rb1wgp jd7o,ue 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 their frequencynz9m/diu)p n5njvno l9 8 *f5cja.y6z 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-MHz 8cuarc3 p. tc m,7qcs+1k0 mhjradio 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 wavelengte*s2 asi fj (hw8z* 4ygvc7e7qh of a radio wave signal transmitted at a frequency of 7.2 MHze7*ehsyz8 *74a2 vwg sf i(jcq?

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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 fo8h njdes69q1f ;)k1k(juqcqug /,vexr the carrier 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 frequencrv bi(mgj;(( p7q qji/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 1/2q9+j g7(oqeru .sj bsb c hh8/9, lpgmwj4tc.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 tc(q-kn7v.ob+w ;r f/ pk4wcgqo 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 loc1b/hxoejm6fn/mc zz 5f ra9*. al 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 yfwy(ammt )n 7 ezl9x9.ear (the distance light 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 indicates that a transmitted pulse return as an echo in 20 ms3/mpc/vuy+h w after transmission. How far away is the reflecuwv+/3/hp m ycting 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 atmoyxz2 ) yrm4x 2m;)nplx7 jcui.sb5s;ksphere) at a rate of about )xx4 xp s2rsmcku;y7m52z l;) ybj .in$1350 \; W/m^{2}$. 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 atmosphers g mv;5n3kml)mefml8e0p (a; e) at a rate of about m p0e mkmgf( 8) 3vm;al5lnes;$1350 \; W/m^{2}$. 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 q-.oqbk vm77 hfrom a 100-W liob-qh7mk.7v qght 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 2.6o 9ef;pmzdl u2lw h)35 m from a 100-W ligf oe hm2w p)39ul6lz;dht 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 diameter. Whait*6 7s kf5;xf2h2njdw 1bdtx t is the average (rms) val ; k fhsdx jwni75*d212fxb6ttue 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 ar7 )/z7.duwzi2 g dohyverage (rms) valugi./ur z2dh dy zo77)we 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 gnl im86iiap2:rs2e vn1z,7/efzm2m across 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, given t88qmzdeaw;9 hhat 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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