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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 l 9yuyd) duqu3nk f7bxy3oll2-g+9)q electromagnetism 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 pro vmq6 bwm+x9isdl*r*2 cbcx(;1un8x vduced 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 wo5fdngm5yvwx p * /mz; x,5:wzill 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 tfc0s16,ai 13qn mli-)uztxmn3 * fokcravel 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 electrovcsn- w7r e4d;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 travnx-gi z0:us f36is+f o(ewz6xel 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 elecit4b 2ji8hj22bo 4:kgzib p3 btric and magnetic fields in the radiation field are found to decreas2i8b 43ibo bgk42pzjhb2ijt :e 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 ip*p 3w/ cwb2uos traveling to the east. At one instant at a given point i 3ocuwwb/*pp2 ts $E$ 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 a3csn8:kql ci.s ; 4t -jw3v.riqn;o rmntenna that is oriented vertically. What should be the orientation of a straig miwo:;33tv-csq. icsnn r4jk ;lr8.qht 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 wavesgkju ,-ufrh y-n3v-d:(cw:um are

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12#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Of the following, whichdaq83 nttuq+( *b,zicgg w7+o 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 wavs-d*8ie)m nx ielength 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 transes.,q s vbhf53s;x38tdl0zful 6 6ooiports per unit time per unit area is the;xblqhed3fto05sf slou68 s, i6.z3 v

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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 waverh slpxsfxr)w eod l83b*b6gosu0 5( kf07 5*v 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 corcg vl vn+.e(d7m1qc ux5r*cz;rectly lists electromagnetic waves in order from longest to shortest wave;czc+ v m7 1g5lxu*.rc (qdevnlength?

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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 wav.,ufgob0e epxpvu0xi 4,/q 6wfi*c5xe has a peak value of 2.0 V/m, what is the peak value of40x feow,5ipieb/,xu f 0v*c pu.q6 gx 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 waves if their frequenc z.yer7tel q3nb,du9, y 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 ouncq s39*wq9*zzc7 8rp)jb m jf 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 wavelength of a radio wave signal gmv nfv 2f2xq9 6e.ma.transmitted at a frequency of 7.2 MH9anmf6vegx.m .22 vq fz?

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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 carrier15 vmfs/a oy 7lv1yo*w 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 microwavesbqlszqu 3l15 8)h-vqv 1 :vlnl?

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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 mshy edv;0 .xpu ,pl7lg nj7/*u bps:m5y?

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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 trave5rbi::o*a0a uz uj im5l 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 f4ltq 4c8sz*7 a g)rfap/eyp3 lrom 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 (th1x*tbxsvbsa4 zdsa;8 0,t5 fde distance light travels 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 teyufi7a- t7/ihat a transmitted pulse return as an echo in 20 ms afeif -ati7y u/7ter transmission. 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 the Eac swm /w 8wea5*0ujds4rth (above the atmosphere) at a rate of aboe/sua 4w0j8csw *m5w dut $1350 \; W/m^{2}$. 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 r2yt.y vybztk4 a205vfeaches the Earth (above the atmosphere) at a rate of aboukt4a20y5vy2tbzy vf .t $1350 \; W/m^{2}$. 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 f wn8x7. m+:ktj2btk*ore7m eiskz3 -wield at a distance 2.5 m from a 100-W light bulb?e8knz7+t o2mtrxm-ijwsb3e:*7 wk.k

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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 fqm3op p 9ua, k:5f 1yefjlg+t -ix)0scield at a distance 2.5 m from a 100-Wlp3:s ty9ju ,- 0 kcx+f5 f)iogampqe1 light 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 2.00 mm in diametgw)ns 9qfslk 8pf-w (:er. What is the average ( 8w(-fkf :lsp)qg wns9rms) 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. uo je /ssd8ix vm36bxu*w3(l 8 What is the average (rms) value of the magnetic fieldxw eo3 u/8j8su(i v*bml6dx3s ?

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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 transpoj 9n-8znlvbp(r f +5 tr53yxderted 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 4xd 3-ac:xp pn)uf6yc output 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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