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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 w)bb;v8( 39padrs )jvu z.iwddeveloped 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 produe4)eqnd,7* 9s5c kmaiqqfsw 6 ced 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 p zah4*v4 lthk,roduce a

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4#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  All electromagnetic wavessa64;e ww)rvc travel 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 all electromagnetic wavesd vz3 oxxi3qyu .x*s-,f h.pvo-b7/q3hj 6cza

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6#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Electromagnetic waves can trzsu e3 fef/ -sj6g8;wlavel 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 radiation field l bnbn;*1 ha7uare found to decrease with dista7 anb ;bnh1ul*nce 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 instant at a gija 9p+pspgmh /z1d-d, e.w nvw/ nyhean :,-9rven point itssv-:we1p/ enndgz9pdah-w n/.h pra+ ,my j,9 $E$ 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 orien*ks bv/q9c2h( seszk57lbyq .ted vertically. What should be the orientatioqkh 79sle 5cv/yb. s2s( *bzkqn 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 are).b g ib1j9qyb

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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 nozmjc x -uueaf2+qq*ni3bfh 9 4 . 3)hl0fps1tst 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 w4j6m6 ot o/:gp7mm.ifpszy n( avelength 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 area7 dr6shhun-rs6 4ta:f.skii-4 pt4 ka is thekhrfps:sh d-a7ui -s4.6 n i64tr atk4

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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 exert ew(x0jb ah52sed 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 correix,:g1 3wd hkdctly lists electromagnetic waves in order from longest to shortest wavelewx1hd,dgki 3 :ngth?

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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 v r)uw+ l n8dy76ndydp;alue of 2.0 V/m, what is the peak value of th+7pywdnr y6 lndud) ;8e 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 theituo83 meymz22r 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 wavelength3k ( rq)+ycrval .kuq4 of a 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 wavelengthu8 bp/qlqz t.; of a radio wave signal transmitted at a frequency of 7.2 MH . q/tp;quzb8lz?

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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 carri*.r -d(v/chla9/aqzm zp pql7 er 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 mip1ceujrh/2cf5p , sp ;0*jysjcrowaves?

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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 1.0 ms?2bw7ko rdi qi7kkeu75gf) q2q..lg e2

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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 travel 1.wy uo7 (5f(u,j ati,an0 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 fromsdpog eg3fn 26 z2u3o (50deyp 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 travely4x0zwn+b7j1 .fcmbgqn)w* rs 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 returd/bu :+)bpp3 lklcm8sjg1yv* n as an echo in 20 ms after traup8sbmpkl v:1 +/cly)g3 j*dbnsmission. How 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 th/lj8kasn-dk0r 7hvnq 99cn5*a+t ps je Earth (above the atmosphere) at a rate of about kl09kc9rjas-ns n7 q5d+tp/* vhj8an $1350 \; W/m^{2}$. 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 (pp hcdjie0,bo :u5-/tax8 st2above the atmosphere) at a rate of abou ue8b 5xtsp,hia- od/:pc2j t0t $1350 \; W/m^{2}$. 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 f gqpe0w.22hjt z:s0xx5o5xzdrom a 100-W light buphj 5t25qgz. s:zed 0xow2x0xlb?

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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 fi;m, kk)qxz si9eld at a distance 2.5 m from a 100-W light;q)mkxs i9, zk 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 bepxsi,ygd:ab3vd e ge( 23d5a8am 2.00 mm in diameter. What is the average ( 5gx3yp:i8da v3 ag(e,eddb s2rms) value 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.92p95ooho(o gxmxa ,c What is the average (rms) vx(goho9 xpacm2 5o9o,alue 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 aq ;ycsvovh(cr;/a *hc6/ sb3h $1.00 \; cm^{2}$ 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 thatjxxf l r; 8ws(wbhhz53-kx )5y 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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