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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 develop/ld s*d 0qsb1ged 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 prodj(+khttjc br 0czi+wma 68m 4 f(xlw(2uced 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 pronl8bee lxdak1j kjcc nd-ru -548 *5s-duce 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 throug7 odl.bg.nddt0a,9 fth 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 electraond 8y;0)53vrz upvzomagnetic 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 travel throuk qhijo6f;bl.;fxv 29 gh

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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 m zdrb6efmr4 2b30g m3:ch eeq0agnetic fields in the radiation field are found to decrease with distag b3dree f zhm6r0qbem 02:34cnce 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 traveliinu;ff k8n h/ (o x08nwwkjb8;mxy).vng to the east. At one instant at a given point its o08)i ; n/x.bf v hwn ;fj8yk(xwkn8um$E$ 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 thati bmnmz*8 g na -1zd/+4ntsyq20.ysyt is oriented vertically. What shi y /d q20.*ntzy-nzma8n 14bgms+ystould be 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 areaa0xjcj*;*l9 9q9bjypf l 4n a

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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 i/mwd p:jyl6 llen27/ts 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 wavelength froms h*7e73bnsrf

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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 h s0ah ,csfu*j ) 3lwxp0*z(jyunit area is the) s( 0hf**z l w3jha0pux,jsyc

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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 elecu1q;706vxfwgtd,bbme s b+ c,tromagnetic 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+j9 h(s1r( kxfuo 7xnx from longest to shortestus+x79f1 kxr x(joh(n 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 of 2.0* bt 4o0dupfu5 V/m, what is the peak value of the magnetic fie0d4ob5*tfp uuld?

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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 ligh+icjsij x.7y et; 85hee1 g:qnt waves 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-M43qb(6 t6fiv e: rrbhjHz 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 transmit)b o80 n7mzdr.qdi mt3ts 4n.gted at a frequency of 7.2 n7rtq nzd )b 8domt3ism.g.04MHz?

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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 carrierg0r fjg1tz ;v8 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 yqu xp2r- vf -r3w/pt42xx,rw 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 ingk znrh +9n(5lad, lm+0zwk i5 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 light to trave66yi53kqey mzl 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 a co(6 a:yomwqq6hyl*p (b.*35qleai 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 lwp:mj*pd 2 e0distance 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 pufprp** l 9xp6z 7p*bxmlse return as an echo in 20 ms after transmission. How far away is the reflectpx*xrlz 7*pfm*bp 96p ing 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 atmosphere) at ajerq(33n6qo v rate of aboqr33jnq e( 6vout $1350 \; W/m^{2}$. 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 atmosphere) at knuwe.3(duhk dgnr9j;i +) s /a2q6zza rate of abozws.d ieg dku z9j6(n2+/ qrk3;un ha)ut $1350 \; W/m^{2}$. 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 esm8 au-6+ z .bvf1gnftlectric field at a distance 2.5 m from a 100-Wgb8z+.nv-u1at sff m6 light 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 valuet ybqxwz9ni dg:*61k4 of the magnetic field at a distance 2.5 m from a 100-W ligbi 4zy16* xg tkn:9dwqht 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 diameteew)tf1kx and k 3t;8*auun)q3r. What is the average (re3kx f)*)uatw ;n3t1k dnaqu8ms) 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 narrowh6;80.m h3fyh l pkckk beam 2.00 mm in diameter. What is the average (rms) value of the magnetic fkpkh;mlh.h6c3y 8k0 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 di0z +6 sa6svv(ha1i wacross 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, give9yl27oq v u2k,rr ln:xn 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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