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

1#

The basic equations for all electromagnetism 9km 7cvy p))cin5e+tawere 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 prow-i /;fv8 hqxoduced 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 fielm,wtb:zdfa6;wp vs7slh p)* 5 d will 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 wavl-lge9 ( g4,z)jraz p x/dm)ones travel 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 velocity of all electrop;i vsoit*15j m+/)e hpftld5magnetic 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 throud4v 85n k1pt61uwpkvggh

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 bothw3 8c +mf,j6qxx6 / 9x3g nqqsuqe,upi the electric and magnetic fields in the radiation field are found to decrease gqps8mxnqeqciu6xwj+ , 69 3xfu/3q, 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 waco1: tz 4 bua560*pvz yaqh*is traveling to the east. At one instant at a given point its aau:vbw46 51a0c*ht oz*zypq$E$ 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 gic4 kxij4d2v x- 1j9jantenna that is oriented vert41x ivkji42gdxc j- 9jically. 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 arvvki r h1aeoab :a;p/3z6 sb5/e

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, whiy1nav)fu;at1:j;tt t ch 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 wavelength frfpo/*s8pga ; gwlxs2c+qh5a4 om

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 time per unit area is theiknd: /u qan rmo,ob:f+ey1.+-bj p:sos:dqo f,:an.:yi e r+kpujm+b/bn1-

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 exl++mpebblvdof*v 9l .el563 nerted by 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 correx.i xzx va;n-:ctly lists electromagnetic waves in order from longest to shortest wavelength? ;- v.xzaixnx:

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 value of 2.0 V/m, what is th(-ros5h :agyd9u9ww ps /p:dne peak value of s: d/pd saynw5p99hr ow-gu:(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 of light 5rgp *q78lt:2pp7fc)roxg c rwaves 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 92.9-w:eyx9qj ud .ve afan/ *-6o(yMHz 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 ra0vb. uxqn2j re:x9) 8pc swo,qdio wave signal transmitted at a frequency of 7.2 Mb0j).x p8r 2nov 9e:uqq x,scwHz?

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 station WBRN 1460o r/+j, i2yo fem.z1ec?

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 microwaveszcx.8vs4mkx0a ml*e .?

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;towux 4l nc*+ 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 75pvwf amrv0 pwu4ssgx.4k(9 light to travel 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 t(s;(+jo m .at8mq6d qjvyut w;y doj1+he signal 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 dizmzc61z 7v 8x y)rcni-stance 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 transl4e1 d xldh5a tjnts d6*)4nj2mitted pulse return as an echo in 20 ms after transmissa*ds4j)14l hn edxd t5ln6j2 tion. How far away 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 (above the atmosphe-ijgt wg7 )8hzre) at a rate of aboutzt 78 j-ggi)hw $1350 \; W/m^{2}$. 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 reaches5a;b t gu1rgf7 the Earth (above the atmosphere) at a rate of aboa t7bg1fgr5 ;uut $1350 \; W/m^{2}$. 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 valuey* v97p6je hvc of the electric field at a distance 2.5 m from a 100-W lightj9h vc7 ev*y6p 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 t9sl y;pwuq t7hx)3f-rhe magnetic field at a distance 2.5 m from a 100-W lig trq37psyx fu-;l)hw9ht bulb?

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 o7ax wq 2 v8gr:9w2dqf+xubg: narrow beam 2.00 mm in diameter. What is the average (rms) value of :xgu7ora2 v :w8qgf xq d2+bw9the 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 2.00 mm in diameter. Whj00bw2qrfao 5at is the average (rms) value of t qw2jb50 aof0rhe 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 transported ac+4ys pn0w6get2y7q k eross 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 that aboutut 8qxm.-zs z4/wd -hg 8vch:s $1350 \; W/m^{2}$ 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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