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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 .m2vwmy ,)e 5vbw2ojrelectromagnetism 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 produced bxt i :)xky/6ady 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 produc8dsb2 ,m-si g jqtel49e 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 vacemhjin0vj/r ; 5x 6idaw7 ui+.uum 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 electromagnll4y uftmv t+cg2e-84 etic waves

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6#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Electromagnetic waves 9. gnknud;vt: can 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 an+n b,c:f ten4vd magnetic fields in the radiation field are found to dce4t f,b:n+ vnecrease 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. At one in p0a1,n,kdh i0qbb.rastant at a given point ia rqi, p.k0nhdab1 b,0ts $E$ 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 4r 8qp-:eap6 p. auc,fommqb;rx5l4eby a straight wire antenna that is oriented vertically. What should be the orientation of a straight wire receiving antenna? It shoq,bfelo crr 4p.-58uem a4 mpap:x6;quld 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 by/ec19 pzz1 pe-*a y5))tmrg:ahmu8qfexl1are

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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 ixa1d,i)bz*2,1sae *wd ndab fn 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 wavelength frovnupx lvf 792+8ozoa f-z ../ qiwx*yam

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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 pqe+j- *ffij5r er unit area is the-je+r 5f*i fjq

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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 wave + s1j,lu lxlrd9u.j u)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 electrod55 - cewnle9qmagnetic waves in order from longest to shortest wavelend- e nqe95w5lcgth?

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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 pe2b q:4f-nxvy + /dye*wqc8xhn ak value of 2.0 V/m, what is the peak value e x+nfdw/y 4 bxhq-:qy2vnc8*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 wav:wd+5 0is02diu +oqs zhh w-jcac-i7 ges 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 fp in4i3mgwj9 3hq; ,la 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 of a radio wave signal transmitted at a frequena*c oh g*dt*-4 79tbmeemrfl 0cy of 7.2 MHz *hmc t7gafe *0l emdt-b49r*o?

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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 1et g (h;m u1b6v49/vgeh0 ggdb460?

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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 cy4e ) 2oqs6/a( e-pfdw;wmivof 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 8y i*hwh77hy t1.0 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 takb-t9e j.9/h; x7)tfx btqqsrp e light 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 rav+;in w-ngt7 sri lxv /zez9r/h2, i(adio 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 travels in a yearuwy/smp3 kjt v /sshe4;j: u+c,z-3bu)?

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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 ub m,3nta;z/rin 20 ms after transmission. n3a,/ u;b rzmtHow 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 (abovet9p)xm ,obtowmw c*m 7k w;71o the atmosphere) at a rate of about*mtmxo o w)b;kc1m 7w79wt,po $1350 \; W/m^{2}$. 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 atmospherek7ca,n+:prn ss3qivk-o 5qrm (7s)g 0vy7vnn ) at a rate of abouin7)kr ,pm:qns5qv7v3gcvnr0(s y- a n+sok 7t $1350 \; W/m^{2}$. 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 fromwhm;ae-wm g4,dwhp,cqn8x +5n*z wy 3 a 100-W lie,zwq xayhw5m-hn4wcd3gn, +8w m* p;ght 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 p l;m /98dp4g ajds(y iov5k.gdistance 2.5 m from a 100-W light b(ai/48p y5mk ol;s. d gvdgpj9ulb?

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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 ,- p,3 hbac9xo c5db5l7 veov )gtxt,sdiameter. What is the average (rms) value of the electric fieldx e,ht3ac,o5c 9tbd 5b, vxpvg7o sl)-?

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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 diame2q1m ay-f 1vfkter. What is the average qa2vmff1k 1-y (rms) 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 trans cxi/v. 9j5arzlh 6b:hz3p4gvz2 qzp ;ported 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 outpu19zq/p+w5w tdw.k i gkt of the Sun, 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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