Physics Unit22: Electromagnetic Waves

1#

The basic equations for all electromagnetis, pg06 g,a7hqkcsjy;tm 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 *quk(ni x6 :*p ipvqjku-*9ie 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 will producc1 zoh+b 829c2ynhrbme 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 travel through a vac8hx,nnz x) s/uuum 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 velocity of al)p cmm9*t,mg,ow33j5one1n sz:hz b al 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 throc2a. nq qgdg-2ugh

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 and magnetic field*r mb5z 5wd7e b:rx2 qlxf(;ums in the radiation field are found to decrease with dist mq5xemx 5 (l;:frb*uwz7r2bd ance 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 wc)9q,oow s vb,+ny,straveling to the east. At one instant at a given poiw bovso ,scnw,, +qy9)nt 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 is radiated by a straight wire ant131bb)n 8l jgmwhdm; w0foq)fenna that is oriented vert dw 1)m8nfjw1fbhq) b0l g3;omically. What should be the orientation of a straight wire receiving 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 waves ar2dq( xfy rj*dj;ldwxwf,fk8: ;s:8f p qx .)hme

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, whic7a e54p1tp uds vci*gze-o+e:s(wsg5 h is 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 wavelengtw:yz)cz qtfs ;1p*/xjh 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 unv1yf7vl48zux yf01f y it time per unit area is thef0l yuy17yxv z18vf4f

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 anlht fa,n90m8 (wo 1mdc 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 correctlybdj4 *sq*s4 sq lists electromagnetic waves in order from longest to shor j* qds4q*4ssbtest 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 a :ufxpj.g;y1in an EM wave has a peak value of 2.0 V/m, what is the peak value of the magnetic field.p g 1:xjy;auf?

A.

6.7 n T

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 of light waves kh j :q4uuwupn1u07n9 if their frequency is

5.0 \times 10^{14} H z

?

A.

0.60 m

B.

6.0 m m

C.

0.060 m m

D.

0.60 m m

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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 92.9-4bh4xnr3fnj m + g(bc wx.w2+dMHz radio wave?

A.

32 m m

B.

32 c m

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 transmitted at a frequency of 7.d pm;mna gw6 k8d+5a2j2j6kl01bhq kc2 k85ka 1klb jdgjd6pn2h0w2 c;qm6am+MHz?

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 the statioh4v m-on)qpv,n WBRN 1460?

A.

2.05 m

B.

20.5 m

C.

205 m

D.

2.05 k m

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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 microwavesu gz42lx -q3lq?

A.

100 M H z

B.

400 M H z

C.

15 G H z

D.

73 G H z

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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 uv8asgre)5s 6e 8bq w-kvbw,3in 1.0 ms?

A.

3.0 \times 10^{14} m

B.

0.30 k m

C.

3.0 m

D.

30 c m

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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 3: fpb,v9rv)n8mk rqj jo.oq3to travel 1.0 m?

A.

3.3 n s

B.

3.3 m s

C.

3.3 m s

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 loca*(j pa2wipgde, i -l;nl radio station to travel 20 miles?

A.

2.8 s

B.

108 m s

C.

38 m s

D.

108 m s

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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 year5lx g hcko)1j b5m-ok4)?

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 transmitted pulse return as an echo in 20 ms a konsv78(1vbxv;coo6p w6e h 6fter trao6p6vowc vvsx 1(nbeh; 7 k68onsmission. How far away is the reflecting object?

A.

1.5 k m

B.

3.0 k m

C.

6.0 k m

D.

9.0 k m

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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) afbw51m 8od0y it a rate of abou1o db8wy0 fi5mt

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 7;j.14 z d7 u npvojkhqgf/+onthe atmosphere) at a rate of about k;ogzn j1v/d+7f n7juo4hpq.

1350 W / m^{2}

. Assume that this is a single EM wave and calculate the maximum value of the magnetic field.

A.

6.7 m T

B.

4.8 m T

C.

3.4 m T

D.

2.4 m T

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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 distance 2.5 m fro,h4+hn hx1qd i rq3e2om a 100-W light bulb?4+ho3reh n hiq2xq,1 d

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.vg.de :j+ sa,.nl5 rzv5 m from a 100-W light rg:..,snevj+ dzvl5a bulb?

A.

0.20 m T

B.

0.14 m T

C.

0.10 m T

D.

0.071 m T

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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 airk/kp81 wy*e narrow beam 2.00 mm in diameter. What is the average (rms) value of the elect8rwp/ky k* 1eiric 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 beam 2.00 mm in diameter. What wco20 jucr)y2:kz drq y,,4isis the average (rms) value of thekqjywu r2)crod, 24y0 scz i:, magnetic field?

A.

4.5 m T

B.

6.4 m T

C.

9.0 m T

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 trfjcds6i 3 i-v8ansported across a

1.00 c m^{2}

area per hour by an EM wave whose electric field has an rms strength of 21.5 V/m?

A.

0.44 n J

B.

0.44 m J

C.

0.44 m J

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, given that about +yo+nnv) n ,uk

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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