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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 btg. lwblt)xt qmes+;j6kb9m2 p1vc/+y

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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 produqsfjjr /2+r 6wpn*sj8ced 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 fiegnyc62 vzhbbo1e 8w 8f.(s *zald 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 87xjmom1kxo stiu6e l9g* c 9,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 all electroxyta8h+j;9 6+ s8tajgupr8qd magnetic 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 travela0 4sc*py5zam pz9r1pwir 32y 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 rw95rbw79elujo5ca4 p9z2 no dadiation field are found to decrease with distanczr4 a5wucj99o7owpbl59 end 2e 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 og)kkrqpl5(1(5s6tj-fb bk d une instant at a given point itkk(klt1gr5(-fqsd 6b)j5b p us $E$ 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 tha 88hal(kdvi.zt is oriented vertically. What should be the orientation of a v( 8d 8.izhalkstraight 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 arei2kps ;zu z,*ev 0g:nyarga; 0

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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 el0zlu,*wdu7e0irbhk c:rhr5q )fh e /3 ectromagnetic 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 i4) m yn9kx3nmdhize 1*n wavelength 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 i - 1j0xk(ozms*0augpei+hs9n s the0-(akp9en01ss+ o j*zh muixg

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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 is called to.zi5 p57pom yhe

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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 owv +:g ocllcq44m5va;t h /)qbrder from longest to shortest wavec5 owmcqbav;g4h+vl/ q l)4:tlength?

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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 va;lx3,m 35g5 lq0uj+ukticvzj b1 vo(b lue of 2.0 V/m, what is the peak value of the magjm5 tlx(b50u 3iu; +b 1 zq3klogjv,cvnetic 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 k54yz8wo.n suwaves 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-anitvv65x+ xvg( z5h+ 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 t/0fb 3rpwp0g tv82hjqransmitted at a frequency of 7.2 MHz?0g r p v2bqw3tj0p/h8f

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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 f3eqh eerr :4/jor 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 o*bfw6fj:yow i2h8zr . f 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 3)h xmwg-+yu,uiy ki2(jj ho51.0 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 lightsopge1da vmxr fik;d70+( 6o(e6 zc(b 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 si* 9ysda9v do.vyg*eq1//hsq zgnal from 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 travels in a year) in,c e2gb51xx/x0 9o o-gjlpm?

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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 tranu0loufaj a3r9i hhz 2zgg4( 7/b;rj5s smitted pulse return as an echo in 20 ms after transmission. H7f/j h0hugo z2ab39gz ur4ijla;rs5(ow 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 atmos ypz(wr,en3.bphere) at a rate of aboney 3z(prb. ,wut $1350 \; W/m^{2}$. 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 62;uybvspm 4u;j bc,sthe atmosphere) at a rate of about ps u;4y2vb,6 j;muscb $1350 \; W/m^{2}$. 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 distancea:uyz9*- u chgb8:fbv 2.5 m from a 100-W ly::h guz8auf cv-bb 9*ight 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 a 100.mswg3 p8vs30b d h;bep6 jo5g-W light bulbv.b 5me pj 0w8oh3;36sgbgpsd?

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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 ouwgab1c 70.j bet a narrow beam 2.00 mm in diameter. What is the average (rms) vb j eg70ab1cw.alue 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.mw ie6i( pr9gkf l1r) mm in diameter. What is the average pf m1kg6) (er9.wriil(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 transported acro2oo sjv: z-i-wu4it o)no ypotft5 di;8 99)jlss 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 t0knh.- 4 bpzdof 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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