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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 ,bfii 8gmey khpi 0/62were 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 prod+r n;28t kzmqxs hx4 tq1u87vcuced 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 fivh4lph8if5/0ha 2mb s h9hf5beld 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 trav-xlx f6o9p h-zel 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)m hbns9ewdcw,lv*4t1 s ( 9ef 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 canofqm al t;nm y)h07*k. 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 magnetic fields in the radiation fcbito2xjxl5+ a6d p22ield are found to decrease with distance as i2op adt2b lxxj2+56c

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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)cmiiux(f5 ;y instant at a given point it5 ;fciiuxm()y s $E$ 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 ikn vhoj0eqmcyn t6.(9- 2l9 gis oriented vertically. What should be.nvjl6 9 ey2-chg0qto(mk ni9 the orientation 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 ;;az6gd gb kf p:4kwexyw:;(i 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, which is not electrlb9k i/4mhd), wakcs)omagnetic 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 i e kq5lr0fr;*z +re,aun 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 wa,r moh)b*omx yu5mu71 ve transports per unit time per unit area is themmm 1 xu or5o)*7u,hyb

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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 e si2i 0 ys2o-rlc1ib; s,x9ubslectromagnetic 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 lif ,k/hyk :cs0qsts electromagnetic waves in order from longest to shortq,fck0hs k/ y:est wavelength?

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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 ofefjgi 0mdn(0* 2.0 V/m, what is the peakg d*ijnfe00m ( value 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 if theirk62,jr tpm9uvnde 5b( 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 92.9/6h3h kyi-knw-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 frequency of 7( 1yqzu7lh *ls.2 l h1s *uq7lyz(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 )df )g;l lab)ain 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 2io0 opq klu2o7f: *g5y0 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 1.0 l3(.c v( jtmn0gqid12 dmt2mfms?

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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 ligh dsb3u9w) m,-cvplz:; gq;xukt 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 si81c7m vfx )amggnal 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 ls* 1r(qf-wcf 9lvviizl+ 4vxe ; 12ufyear)?

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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 ms )j8oyb5yugj99v : ,kn 9:zjv hd2rpgnafter transhj)p9 jngg,5u9z:kvr8:jy nydo v b29 mission. 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 reacdb,ayl,/2c pehes the Earth (above the atmosphere) at a rate of about y,a cepd,/l2 b$1350 \; W/m^{2}$. 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 atmospher5z;/5 ngkr4 nfn 0eczxpz56d ae) at a rate of about d 5zn4e6; zc/5rnzxa f0n p5gk$1350 \; W/m^{2}$. 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 vmjzrw1kd8-.ii o8 j; 4pqjw4the electric field at a distance 2.5 m from a 100-W light bulbmww4i8 o;pjijr8 qk.4jv1zd -?

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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 omcr 8l o)8q gr2j.vqc1f the magnetic field at a distance 2.5 m from a 100-W lighcrc2qlojrv .g8q8)1 mt 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 diamey;1 owr:gzqcy n;z6 :fter. What is the average (rms) value of the electry z;gr:qw:o6n cf1z;yic 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 2.3 4 6ceaxqb(yx00 mm in diameter. What is the average (rms) val(c6ye3axb 4q xue 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 bd, ad*d/s4jp ei9 eox;lf(g2a $1.00 \; cm^{2}$ 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, givekczs(v9l u 0bj4rv :l.n 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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