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

1#

The basic equations for an7t*;c oo) gkgazmh 28ll 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 is2 vk4ml od.(xn produced 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 prod 5 clge6 pcu-5fzc+r*g:bwy,auce 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 t/i d)chto a0r+i(ftv4hrough 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 elect+*-qe2ub 6(hyefs tydromagnetic 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 trm7 ,qc8w;yzz fa8zpy (avel through

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 electrk52;c/oo qeic ic and magnetic fields in the radiation field are found to decrease with di; /5oq2coe ikcstance 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 t99j e ajgyi31p) uujf 921oaocraveling to the east. At one instant at a given point ie 9g)11i93u 2jpufa 9jcajyoots $E$ 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.op3q 4sfzegew zd6e5/)o9i :xi i7zk straight wire antenna that is oriented verticaliieq fo.:4 )x65ee/9 zgdips3zkw o7zly. 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 k-* vezkey;p-uw f9hyq )3; ojare

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 electromagnetic,)qm yj7kcr7 mgjrcwt2eu*39 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 wavelength frd4 ,xxury:b5dom

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 waveej7a h8l 6dg4hro6ft7 transports per unit time per unit area is thet87h7rd4jf6go al e h6

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 byx)tb*,6v0o,n o hgugn 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 cor7k 0iw,nkxv6y ;h2h bprectly lists electromagnetic waves in order from longest vk;h b 60h72npiyxwk, to shortest 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 wh6hdy+hl tiw4ev,*p-t z d 4f3ave has a peak value of 2.0 V/m, what is the peak value of t4 ,+fd-iwp6ehh*tt hlv3yd4zhe 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 of light waves if their frequezm25w-* hisp 58lw2n; msopl mncy 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 wavelength9d c z*6z, pfckb4cv49c2dq3rq, n)kmki ums9 of a 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 ,jr6 xh rm:u4ca radio wave signal transmitted at a frequency of 7.2 MHz?: ,uxjmh rr4c6

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 ca3lse+fz ko, /oy sx:mw69dn1 kzpz;(errier wave in the 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 20 mm microwaves?jw5lmq3w)s y 9

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 trave9lyczm /yh2i /l in 1.0 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 trave k+ q*2 pcp(jrjk)bl (h1e6brml 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 sig) p 4trv7yi,x;3csbkunal from a local radio 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 travst-h l,r1og+ lels 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 pulse return as an echhj50sf h5jr vlu * sdz12hh8/:qp tu,qo in 20 ms after transmission. How far awayqlp*zh h/ 1t8 50j:shvhrq2uf sjd,u 5 is the 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 (abo q7wu9n. pfes8ve the atmosphere) at a rate of abopq8nuf.7 w se9ut $1350 \; W/m^{2}$. 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 Ea f4 ,u5ec f2uku08icfbrth (above the atmosphere) at a rate of about2uk e u5f4ucbfcif,08 $1350 \; W/m^{2}$. 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 distanc u wq6uc-6b+zme 2.5 m from a 100-W light b6+uc- zmub 6wqulb?

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 v qvtt pa/5xl6:6z)mnr alue of the magnetic field at a distance 2.5 m from a 100-W light bulbt t z)v6prmx /n:5qla6?

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 narrow beam 2.00 mm in diameter. What is the ave 63 p9hq7wrnanx sf:4ujg7 ff9rage (rms) vahgsr 47f 9faqn 7nw3x:9u f6pjlue 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 outew 0 mkbbfb),/ a narrow beam 2.00 mm in diameter. What is the average (rms) value of the magneb e,bb/0kw)mf tic 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 transported a(p0sr3gs d+.eskt*w 4n4 yhzkcross 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, given tha lrbu qc:dhq1.-cg2h+g/x7bxar a g07 t 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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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