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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 f k ro3d(;bbatr ttlkk2 z37k--or all 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 produced b.vij ipi1)4 (pmb+a+uytcf n7: ds+ diy 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 f4wqcw g) wg+t;ield 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 vee*u gcf2: m.u-e dn4xacuum 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 velk1g0w/ saj5qbocity of 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 z97iiq )qv4na 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 and magnet8 :l(u(e/oc: lmcn tvebfm26xic fields in the radiation field are found to decrease with dista b:meo8 /u mlc6(fcle:vxn2 t(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 sr;, sjn(ulw 1hn n.q4at a given poi, nns;14wqjrh.l uns (nt 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 -/9bw ( o t2pnx dgi.gx:aj)fo8sy;sza straight wire antenna that is oriented vertically. What should be the orientation of a straight wire receij:bgf 2 9; tas(y)ndzoo8-sipw x/ .gxving 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 fwi 5)llx+ w2 1opm1rfqr(h z9are

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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 is06mj0 hpoixle6pha/,wt eb*7 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 wavelf g l.69soi12c)trhy2 hn( pdlength 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 is t)b rv4aq p4*ckheb vr 4qpak)4c*

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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 a)/,ami8 yu mumg:pa)cn 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 electromagnetic waves in order frxqxq(i6- nt l ;/hxq-rom longest to shortest wx-lri(q x/qt;xn hq-6avelength?

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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, *6hm+i:ebgxm pyj(7 wwhat is the peak va g wbxph+i m(j*ey7m6:lue 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 waves d4yydz91t:di 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 2g ::i5ekl9 (xokeaes92.9-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 s(pz jpxx-2:yqignal transmitted at a frequency of 7.2 -qzx:jy2x(pp MHz?

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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 1460 +/o oy3s4zez5 xuut2mm4.why?

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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 2(bap:kj,tz h7 0 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 tra4vlg4s t rsxl; ;c:uc,vel 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 lightr j*xseqj7(x+ 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 travel 20 m g6:y2cjra1k tj.i- uviles?

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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 y/p.imv-rty 4 cear (the 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 that a transmitted pulse return as an echo in 20 mis ,4r0d/txmb s after transmission. How far away is the reflecting obj /ds4m,0xb rtiect?

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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 atmosphere) at a rate of abo0-38 elwaned(fwm:)0fklx 9uvwii .sut(u eiwfa 0sx) .fwl-vmkl :in90wd83e $1350 \; W/m^{2}$. 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 E e3dptpz mk14r+0w)+due s kx;arth (above the atmosphere) at a rate of abo0k;pe +1 p+exd4zs )t u3kwmrdut $1350 \; W/m^{2}$. 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 t a b10kwe*9(x:0 c e hn*tzupl5di0wmvalue of the electric field at a distance 2.5 m from a 100-W l 90 (:c1w t *l0hnpx5umetk zde0ba*iwight 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 fxpj+p*3jpq2o w e+noh/drx6eef9 c+:8ig i:lrom a 100-W ligq g/j*3pcwppxfln:r xei+d o+e je8:269oh+iht 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 narrowc .rm uft k ve++nzt*h/kjw 3tas5*2a7 beam 2.00 mm in diameter. What is the average (ekc m+32 fzht7+5 r/tvw .naj*utak s*rms) 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 wvsf+ 1 fhc4/otxc4f( ok- 2x1bu17 hfsw2nd kbeam 2.00 mm in diameter. What is the average (rms) vals172 2th- k1 fwo1f/bwcncofuh4s d +f4xxk(vue 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 transporo e rgajw((1 gfqy7m c9:jj:u.ted 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 output of the Sun, given/ltl9fgq, ygpnddnpk0/*b*3hd *t4x 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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