Physics Unit22: Electromagnetic Waves

1#

The basic equations for all electromagnetism wjh +j56ch8k yhere 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+sq /u7oq 7 o4r5 upxpp-xjxb; by 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 v(;mm1 s0g, i v lz2jjsj+nj.fproduce 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 th,:a(syuztz37i gb th6 rough 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 velocity of all electromagneticoa: tl6k3 mw;rxh6w2r 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 through4ka5f*wj 59szy/n2 oqv(gslh

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 magneti letg3f7e z*km:b/k wh j77p)ec fields in the radiation field are found to decrease with disteh p fz/b ke7j3ket)gw:7ml*7 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 traveling to the east. At one instant at av5dv 3x3-z ack given poi3zkdv5 -a3xvc 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 antenna that is ofs002tyyskz.7o: lt*)m 6 avmk oqt.m riented vertically. What should be the orientation of a straight wire.2l yao.oy)*sk7:ttfm zmkq 0tmv s0 6 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 afgmdj+wh3(5 zre

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 is not *uru.;yu-o ok;hm)j uelectromagnetic 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 wahr1z(wub u8 *evelength 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 p.: ld-rz1r6bs63kmg6s;dj(id ox uiaer unit time per unit area is thed; ixzbm:l gsd61o- sai3 r(kjr.d6u6

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 bvoi-9ak :9cvoy an 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 electromagnetic wavemrt5+rmghg.;x:r 1 lts in order from longest to shortes5 1gr +mgtr.ml th;xr:t 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 aem on;un a574m-tf3 ocmz77af4 /vqgq peak value of 2.0 V/m, what is the peak value of the magnet m4m7-qenafaz 775ot /vmoq n;3ufgc4ic field?

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 if their fre n/4-lbi3m dsm h-)lyzquency 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-MHz radio wavet9kkjwo.f -6, mfuc7t0 +q wlh?

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 transmitte.8h:;m,clnekh s,h pa zi7ci) d at a frequency of 7.2 MHzec zm ;ih78ks,,aph.ic)n :hl?

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 w7si8+ 1gry okapye0u i o6mv-+ave in the station 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 frequencyd ,v0xq+ 1dtyqa t)v,g of 20 mm microwaves?

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 travey9h. /,kq(ur uv qcju0l in 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 ligjewtb(-ox8l ,js7 x-g ht to 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 local radio station to travel 20 kpbtz0t4b1/ ;r9l gu ymiles?

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 (the6ief-* ixy3noc;wc:x distance light travels in a year)?

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 pu3/unx9hq5sler n8xad7l ud 9on+7c 6j lse return as an echo in 20 ms after transul78 lndhd6e/s x5onx 9c +au97r3n jqmission. 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 (ab1-w99 piqc g bqh+,uybu67vknove the atmosphere) at a rate of aboi, b+-9bgwh9yqq ku1v76pcunut

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 apstb tydpv6oh:sy*3 8z, 5ueqvk+2b5tmosphere) at a rate of abou2 8dpy:usesz,htpt6+ok553 vv y* qbbt

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 ofphsmi(sxu:: p9/7 lzu;4i jhq the electric field at a distance 2.5 m from a 100-W light b9l hhs :xzmsu4;u(i 7jp/pqi:ulb?

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 val)l-qq+++re4mjx v x hlue of the magnetic field at a distance 2.5 m from a 100-W lilm +lqe +) xj-qvh+x4rght 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 a narrow z3afdeu 3p/+2g( fwxhl6lw5 hbeam 2.00 mm in diameter. What is the average (rms) val(f+hlu/ ewdfpal 5332xwhz g6ue 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 beam 2bqhngkv:6br chmww xua u345dub7v-1j 1 -0* y.00 mm in diameter. What is the average (rms)n xjcb6m0vkw- b q d3yhu1rvh7u1w* g4au :b-5 value of the 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 transported across aenwm1j 42p9j z*wd3ig

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 orww: 90.s i ytju4snt0utput of the Sun, given 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

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

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