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

1#

The basic equations for all elecji c9i b+,g0cs8hyyixd77-ol tromagnetism 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 pro- l tu,g9hs98ydvwvr1duced 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 willnv7uvwfj0:an j-jpcw y.12y) 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 travelyfr, 8mwb+5 pb 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 ofyz1j 2rfo260lsy z1mk-;xg z v 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 trav4lfp9 uccxts f5+ vu:+el 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 electric and magnvvxpvenr a9n+; h *6(qle7.qvetic fields in the radiation field are found to d*7xa+vp l9vh req6;(vn. nvqeecrease 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 traveling to the east. +( 4 (hmnz*ylk*cadi;hluwz 1 At one instant at a given point i(a;ln1iczm(lu *4wh d zy+*khts $E$ 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 strai/ ;w0lh- qbliezj w+,yght wire antenna that is oriented vertically. What shouq -be lz/0il;wwj+,yhld 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 wave/pva -dq:mbxx,d)+sx,iz d *ps 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 is not elect7ap3ks s(9 ffv rh5*jeromagnetic 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 ,bxh(*qd9 np win wavelength 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 time rdahhun/ 8q2q6pg m ,4lb:og,per unit area is theq, 6guml:pg4a/h nbh2q do,r 8

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 ar ck 3nlmhc +p5wc;+jc e-y8tk:ea exerted 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 correctly pe*9 -cx6fpw)c 0js-x lyr.ju lists electromagnetic waves in order from longest to shortest wavelengx.6xp- ryw js )fcu-9jcp0 e*lth?

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, whatn /ai8tlkc:9bx/ 8v4yt9rao t is the peak value of the magnetic fi ay8t:r9k9vt/x8lo 4tn /abcield?

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 wavesbvtfihufd53,, (z1p3nozd w8 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 wavelengt33o9 jy61,jkx csfsg : 0goenph 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 a )vz.hue 1oc 2; a.b1t kzyyf.jradio wave signal transmitted at a frequency of 7.2 z.yf1; jvac.y outh )2bke.z1MHz?

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 fhc8dnm we5u rwv6m:7 9or the carrier 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 micro,5dz4-(jrp; ht es:r wqd 0gfbwaves?

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 traveh-p q -xi+e4ryl 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 travel7jpz8t e6d )pr(2 cvcd 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 station tooxt*qo7 mmo3- 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 3htj*ojf3/z vuau;z+ 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 t2fu au,pdrc4 f2 r+.4p*siyejk3(x o.g+qyr return as an echo in 20 ms after transmission. How far away is the reflectindiguo3xp,r*e( k2c+tj ya y 42+.fq.fps4rrug 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 3zt s - 2;eszsxvols2.the Earth (above the atmosphere) at a rate of aboux-zsl zt2s sesv3;o.2t $1350 \; W/m^{2}$. 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 Earthz77.wn) .a i*hzjh lu3x .prnmh.*hed (above the atmosphere) at a rate of abou.w.h d37ha7 *zeu n)h. hpzinml r*.jxt $1350 \; W/m^{2}$. 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 distance 2.5 m fromx q vi,b ky/mr5.of p4yq r2z*578vlyj a 100-W lj,y mrkyl .f/o*8xvp2ib zqrv 47qy55ight 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 gbqm.5* 253ur n3d0xpdze z2g,eitnf field at a distance 2.5 m from a 100-W lighen2tg3fn20.ibuqzzx d,5m3 r*d5 eg pt 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 narrow ap n /uyqw-n3bps, .51wjvvh9beam 2.00 mm in diameter. What is the average (rms) value of the electric -,v 3nn.svj hqb1puw w5py /a9field?

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 outwpo za,5 j+au4 a narrow beam 2.00 mm in diameter. What is the average (rms) valueaaz4j 5 ,ow+pu of the 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 acron8fz br5jn+6ass 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 outi k051u88c(u vfh u)m+ompgloy .m -jxput 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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