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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 byi;2 0jl meryvu/ 6t i/-l-fvws

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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 producedq /lp8p-x 0 j4ha abbpk6kxe++rx:x q- 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 u(i99bsf1g7swgbb a8 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 vacx wx4a) +2rwhc54qnrj+dtp0nuum 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 ela6x-z: /aqr1 ab8lzb gectromagnetic 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 thw):w 3hxca hu0rough

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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 1xchnhtj x;y;)b n9 q0field are found9 ;qx hn0thjxnc1;)b y to decrease 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 traveling to the east.rlw ib knt) m.ew hd+0d.b4z9: At one instant at a given point its k .drn9wt )hb+ zwbd4ml.ei0: $E$ 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 radirkz*r z9i,.laozog 07+ x0 akzated by a straight wire antenna that is oriented vertically. What should be the orientation of0*zgz, kroa9zoki+xr l.7 z 0a 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 arex2 sp/lvaw kaam *,anye9a;v4fe29 j+

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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 natur*0cijhfpo ) x6e?

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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 wavelei7y7 esqt h3.e. -v6k e3ddhwsngth 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 area is thk- (g5rzy u8o(g4hq*9gcxw gfe *gh(zgw c xkf gg(8q-45o9uyr

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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 a-9t. 5klmp-sevwwiyd3 y ,)hgax d+dfa f4s*1rea exerted 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 electromagnetic waves in order from londk7kf 3xe,akarw 18; c8pmhs2gest to shor7spk1x82;kc ,8rhkedw3a am ftest 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 valuexklpl49s*jlf v3eml ypcqv 1., pgs3s: 0 hy3+ of 2.0 V/m, what is the peak value .yqsyh9+s ,0vxppvl c1e3*p3l k3lgf 4 l js:mof 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 ovtp;3og4c ca7 08n*rpf8oe pef light 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-MHz radiip p(ctgft w8a974a2udj9l/ d o 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 transmie 8 d)w;foxbv*j+hw+a tted at a frequency of 7.2 Mwe*b hjawf v)++od;x8 Hz?

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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 fop+thhz9m( -ru r 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 frequency of 20 mm (, 03xtqnzdl,x/utr3osb r,k 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 trave p9q1efit8m, rl 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 to trfr7p2l( xovr8avel 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 fro:yfzv x 5ngs:n0;(n dcm 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 traveev/)+y 9js nz tn5dac7ls 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:g *0etu;;tum 8mi cgl that a transmitted pulse return as an echo in 20 ms after transmission. Hogg*u0 8 icemu;:ttl;mw 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 wwhb ny- 4x++lsb**wn the Earth (above the atmosphere) at a rate of about++b-l*nxwhby 4*n w sw $1350 \; W/m^{2}$. 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 re 46 fu*s/b3gxwzk0ysyaches the Earth (above the atmosphere) at a rate of abou*y 6zfsg3/x wk4s uby0t $1350 \; W/m^{2}$. 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 electr hyb8nz l7rv*)473 j/cuma u90soe lloic field at a distance 2.5 m from a 100-W li0*euaml7b r/cz948 ny) hj3s7vol uloght 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 ro8 0d2pwmlu8d vu1*e magnetic field at a distance 2.5 m from a 100-W light bulb d2rlowd1v0 u88p*m ue?

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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 amuc,95tlk y 9dverage (rms) value of the electric field59utlcyd, mk9 ?

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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 beaq+8n3)f ijokg m 2.00 mm in diameter. What is the average (rms8fjo+k3giq) n) 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 across a70 b3mp5uobjx ) s5jzo $1.00 \; cm^{2}$ 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 tlvi7yg6jpmd/ejup 7,;)3 gufhat 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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