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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 electromagne .t rgybp6)+ektism 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 produwd 2n k c/f;s4lsoom(tc, -my8ced 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 fiel.jv:lsos,n q/ d 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 tr9im shq,jw 2klpgd ,**avel 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 v2+jd2)k n c+e;lfywd all electromagnetic 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 travel3k-4kl2 j4p x r+ :od(qtvgdon--xmwu 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 radia - ydj46dz0mkstion field are foks0z- 46jmydd und 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 wavee ,yl ynp/y6su/ aq9)erto3na s6:u4c is traveling to the east. At one instant at a given poinys,:l/)a6 e or/nty 3e y69csnu4qu pat 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 radiated by a straight wire antenna that is orientepevuwk*+ * h 45dg-:n pmz6bnld vertipwn: b* 64* hzuk-vemgd +n5plcally. What should 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 arscha u3n88b8je

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12#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Of the following, whe h-q-8za 5/fls s; giftbahfj..3 pt*ich is 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 wavele;xy3hllt- jb 1ngth 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 uniw et654gb9v,bkk bk p/t time per unit area is the/9 gk64kbbwp b,v5etk

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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 arles9ha9 ph/(p ea 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 electromaqf70wb1s sja ,gnetic waves in order from longest to shortest wajswas71 fb ,0qvelength?

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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, wx fq)it:a65dw hat is the peak valuwa qd)6it:5fx e 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 wa p6,w;ltm b2dqves 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 radio o j-kb5+ 5c7f/yd6p ws2srszhwave?

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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 signap/t/e ,5iwzk5t x4eav l transmitted at a frequency of 7.2 MHz?x,z5 e iat/twpe/kv5 4

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21#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the wavelengtx a;lqp:vi*v f 0tv,2th for 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 micry54n :jwb t/gff t-z44abav62oi hdz 2yp3)kjowaves?

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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 travels:,*w o;ibw * b(dl,aw imu2py 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 li0d5ms3 : yq.zi2klin fght 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 tk0uk2 l ce.ce,ravel 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 year-2g5l rk hs3nm:zuxm4)?

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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 2;oqon68/avc6gqkds (u5- oiw 0 ms after transmission. How far away is the reflecting ok c6;-q( o8uionqas/gd5o6v w bject?

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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 reaches3uf19n4cgh fe the Earth (above the atmosphere) at a rate of aboutn4u9 f3hgc1fe $1350 \; W/m^{2}$. 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 (llt qs74gk6 +habove the atmosphere) at a rate of aboul lks4q7+gt6ht $1350 \; W/m^{2}$. 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 a;sph27 i .ebhht a distance 2.5 m from a 100-W lighth2ih ep 7.hb;s 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 2.5 m from k-,h hjcfl0w4(xtd/r a 100-W licf x0lh/4kr-h, d(jtw ght 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 azbpi- h(u n+3ov k9zs7jh3-i 5avgm92.00 mm in diameter. What is the average (rms) value of thnhp uv9 m-73hvogikjaabz(3 5+zi- s9e 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 diatcernxb5-lity c93 --meter. What is the average (rms) value of the mxt-n5 t3cicr- b9l y-eagnetic 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 x//h(mxe3qb*ay kl vb74ocy1a $1.00 \; cm^{2}$ 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 tham3 ddlg6m.0f)ktu g.tt 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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