Physics Unit22: Electromagnetic Waves - 51fly国际课程 (51fly.win)

1#

The basic equations fttr 8xu0;l8znimbjxcs/b 1-3 +x5nd nor all electromagnetism were developed by

A. Newton.

B. Gauss.

C. Maxwell.

D. Hertz.

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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 by t1tm- 8/fhx e+ognc ,wyq+m(gc 3*qjb a

A. constant magnetic field.

B. changing magnetic field.

C. either a constant or a changing magnetic field.

D. none of the given answers

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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 *- xx4i5ub vuf,j,gtvwill produce a

A. current.

B. gravitational field.

C. magnetic field.

D. none of the given answers

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4#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

All electromagnetic waves thaov1w2kv w+) 4,rh gdravel through a vacuum at

A. the same speed.

B. speeds that are proportional to their frequency.

C. speeds that are inversely proportional to their frequency.

D. none of the given answers

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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 vell/e46 qg7erd 44gg72ijh(mdqf qf fm(ocity of all electromagnetic waves

A. is zero.

B. is nearly $3 \times 10^{8} \; m/s$.

C. depends on the frequency.

D. depends on their amplitude.

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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 throughxp :ah7cn 2 onwq3b0zl;51yoq

A. glass.

B. iron.

C. water.

D. none of the given answers

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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 andt wjakq14w ,y5 magnetic fields in the radiation field are found to 4wy 1j,takw5qdecrease with distance as

A. $1/r$

B. $1/r^2$

C. $1/r^3$

D. $1/r^4$

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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

A. parallel to the wave's direction of travel, as well as to each other.

B. parallel to the waves direction of travel, and perpendicular to each other.

C. perpendicular to the wave's direction of travel, and parallel to each other.

D. perpendicular to the wave's direction of travel, and also to each other.

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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 tra*o(,nvtn) /f zq /a vkmq7-abqveling to the east. At one instant at a given poiq//av-z*qmnb7,ok ) vfq(at nnt its $E$ vector points straight up. What is the direction of its $B$ vector?

A. north

B. down

C. east

D. south

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10#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An electromagnetic wave 9n:3 pa +z8 qko ztgv,ypex6q)is radiated by a straight wire antenna that is oriented vertically. What should be the orientation of a straight wire receivi + ,)azv pgzoqnepyq98k t6x3:ng antenna? It should be placed

A. vertically.

B. horizontally and in a direction parallel to the wave's direction of motion.

C. horizontally and in a direction perpendicular to the wave's direction of motion.

D. none of the given answers

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11#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Electromagnetic wavesfu6bgxcq1.ws1b+ip0lj 9 u/n are

A. longitudinal.

B. transverse.

C. both longitudinal and transverse.

D. neither longitudinal or transverse.

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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 ift(.t-71l zy5z*eecmxm: f xis not electromagnetic in nature?

A. microwaves

B. gamma rays

C. sound waves

D. radio waves

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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 waved),etea9l7h,q) p ujf 5fh1lule9: sglength from

A. 400 mm to 750 mm.

B. 400 nm to 750 nm.

C. 500 mm to 850 mm.

D. 500 nm to 850 nm.

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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/s s37-cpk4ovvk1 mco time per unit area is the7ok-p omv3cs /4v1k cs

A. energy density.

B. power.

C. intensity.

D. radiation pressure.

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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 anhwdvwj6+ta3c gb/* +qr y0(yz xz 0i/q electromagnetic wave is called the

A. energy density.

B. power.

C. intensity.

D. radiation pressure.

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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 electromagnet.i s7 08.p us;pcmze- 7j5rhlvlp4ovgic waves in order from longest to szlvpg irshp.-4ce 0vp mojs5.l78; u7hortest wavelength?

A. gamma rays, ultraviolet, infrared, microwaves

B. microwaves, ultraviolet, visible light, gamma rays

C. radio waves, infrared, gamma rays, ultraviolet

D. television, infrared, visible light, X-rays

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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 *yu q9pb)+ m0v jgv1igvalue of 2.0 V/m, what is the peak vay*b v +up9i) gvqg0mj1lue of the magnetic field?

A. $6.7 \; nT$

B. $2.0 \; T$

C. $3.0 \times 10^{8} \; T$

D. none of the given answers

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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 v -x fh5l(idm/of light waves if their frequency is $5.0 \times 10^{14} \; Hz$?

A. $0.60 \; m$

B. $6.0 \; mm$

C. $0.060 \; mm$

D. $0.60 \; mm$

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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 ;wk68i5cwwof w r7z8m 92.9-MHz radio wave?

A. $32 \; mm$

B. $32 \; cm$

C. $3.2 \; m$

D. $32 \; m$

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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 transmittemu;7yh bc u4q(d at a frequency of 7.2 MH(b;4yc7umhuq z?

A. $42 \; m$

B. $4.2 \; m$

C. $29 \; m$

D. $0.024 \; m$

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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 the2 -kse.neg xi3 station WBRN 1460?

A. $2.05 \; m$

B. $20.5 \; m$

C. $205 \; m$

D. $2.05 \; km$

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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 0uik,y g 1 q 85 krnn)ux+ni;wyca2e1u20 mm microwaves?

A. $100 \; MHz$

B. $400 \; MHz$

C. $15 \; GHz$

D. $73 \; GHz$

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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 1.0rg- g hcxe3lxl76 a+8k ms?

A. $3.0 \times 10^{14} \; m$

B. $0.30 \; km$

C. $3.0 \; m$

D. $30 \; cm$

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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 )m.pj; nt) mt2m apmd0travel 1.0 m?

A. $3.3 \; ns$

B. $3.3 \; ms$

C. $3.3 \; ms$

D. $3.3 \; s$

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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.x778:6ixbqd+ae rlktmxw l 3 station to travel 20 miles?

A. $2.8 \; s$

B. $108 \; ms$

C. $38 \; ms$

D. $108 \; ms$

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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 year)?pbgw01+2egyx

A. $186,000 \; m$

B. $3.0 \times 10^{8} \; m$

C. $8.7 \times 10^{13} \; m$

D. $9.5 \times 10^{15} \; m$

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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 transmi qf110ajpv vn4tted pulse return as an echo in 20 ms after transmission. How far away is npva1 vq410j fthe reflecting object?

A. $1.5 \; km$

B. $3.0 \; km$

C. $6.0 \; km$

D. $9.0 \; km$

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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 rs1 0 7/w jil:e/p 4qrk+aawcdthe atmosphere) at a rate of aboutjsl/ 0rk7adcwp/w 4 q+e1ari: $1350 \; W/m^{2}$. Assume that this is a single EM wave and calculate the maximum value of the electric field.

A. 0.71 kV/m

B. 1.0 kV/m

C. 1.4 kV/m

D. 2.0 kV/m

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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)dree;0-xpo q atmosphere) at a rate of about - qr)xe0odep;$1350 \; W/m^{2}$. Assume that this is a single EM wave and calculate the maximum value of the magnetic field.

A. $6.7 \; mT$

B. $4.8 \; mT$

C. $3.4 \; mT$

D. $2.4 \; mT$

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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 6h6+dh 2ua*pzjf 2p5ht spb 05p1np vddistance 2.5 m from a 100-W p526a6h hnjpdup 0 1h+fzv*2sbd 5tp plight bulb?

A. 22 V/m

B. 31 V/m

C. 44 V/m

D. 62 V/m

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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 from ard;*vp 6n6e(n y8pg nj 100-W light bunnj( 8rv;dgpe6p*y n6lb?

A. $0.20 \; mT$

B. $0.14 \; mT$

C. $0.10 \; mT$

D. $0.071 \; mT$

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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 narro.x501mrpxr/2ny je (pekmn .q w beam 2.00 mm in diameter. What is the average (rmmq2nx.rky /p 1exmpn(e j.0r5 s) value of the electric field?

A. 0.95 kV/m

B. 1.3 kV/m

C. 1.9 kV/m

D. 2.7 kV/m

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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 bear xh1qsjuo,(ln5*de/vjrf77 c/*opf m 2.00 mm in diameter. What is the average (rms) value of thvqnf,dhf7( /* s jup5x7jc/r1o*lor ee magnetic field?

A. $4.5 \; mT$

B. $6.4 \; mT$

C. $9.0 \; mT$

D. none of the given answers

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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 transportebt2y d,w-, hrwd 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?

A. $0.44 \; nJ$

B. $0.44 \; mJ$

C. $0.44 \; mJ$

D. $0.44 \; J$

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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, gives7gc a4+dn cl1n that about $1350 \; W/m^{2}$ reaches the upper atmosphere of the Earth. The distance from the Sun to the Earth is $1.5 \times 10^{11} \; m$.

A. $1 \times 10^{26} \; W$

B. $2 \times 10^{26} \; W$

C. $3 \times 10^{26} \; W$

D. $4 \times 10^{26} \; W$

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1	2	3	4	5	6	7	8	9	10
11	12	13	14	15	16	17	18	19	20
21	22	23	24	25	26	27	28	29	30
31	32	33	34	35