Physics Unit22: Electromagnetic Waves

?作业考试练习?通用国际物理?Physics Unit22: Electromagnetic Waves

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习题练习：Physics Unit22: Electromagnetic Waves

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答题人: 匿名未登录开始时间: 22年08月28日 10:07 切换到: 整卷模式

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单选题 ( 1.0 分) 切至整卷模式搜藏此题

The basic equations for all electromagnetism.ly vj-tch3a 0i8ibpdq43mivy t co +j( r90)m were developed by

A. Newton.

B. Gauss.

C. Maxwell.

D. Hertz.

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单选题 ( 1.0 分) 切至整卷模式搜藏此题

An electric field is przw mr..5 ka.8ga*fkzsoduced 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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单选题 ( 1.0 分) 切至整卷模式搜藏此题

A changing electric field waz 38lw9d9bmi*y i*maill produce a

A. current.

B. gravitational field.

C. magnetic field.

D. none of the given answers

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单选题 ( 1.0 分) 切至整卷模式搜藏此题

All electromagnetic waves travel thro. om-2ah97a5 apd,mt:sk.yfqpe/dx yk7rnj 4 ugh 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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单选题 ( 1.0 分) 切至整卷模式搜藏此题

In a vacuum, the velocity of all electromagnet3 qo1v moxr*5p(c9 fmxic 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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单选题 ( 1.0 分) 切至整卷模式搜藏此题

Electromagnetic waves ca) kto l:vup27qn travel through

A. glass.

B. iron.

C. water.

D. none of the given answers

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单选题 ( 1.0 分) 切至整卷模式搜藏此题

The strength of both the elect0v9ki qa1f c5iric and magnetic fields in the radiation field are found to decrease with distance af5ikc 0aiv9 q1s

A. $1/r$

B. $1/r^2$

C. $1/r^3$

D. $1/r^4$

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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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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 a give8 oeu hkksbsq;f8.5/wn point itsbufw8 eqs 5sh;/8 kko. $E$ 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 str,n4jrv uja0- eaight wire antenna that is oriented vertically. What should be the orientation of a straight wire0 vrjj4e- a,nu 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 ak)koih ov(hc9(k3 h2qre

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 g skup62vd )5+w9:,odk j sgte0jfm2w 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 iny8d 7xgc/l/z off(os b/;mh 1f 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 wavrbr6w0wi;a( zn: j)a re transports per unit time per unit area is the0wabi jnar)( rrwz;:6

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 exertedmn/np ee )i--7;nrgx t 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 lists electromagomxl9ba1 v, :lnetic waves in order from longeo1l ba ,m:vl9xst 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 h*-:.zka ce(nwb3uknwave has a peak value of 2.0 V/m, what is the peak value ( enk*kz w-3nahu: cb.of 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 waves i wmlm a*z/o524kn/b zof 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-M8)gbq zao mlre/ ks,o2q4 ;0qlHz 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 ofsh3d .f0pecsmyu+/,c a radio wave signal transmitted at a frequency of 7.2 MHz3c ye+sucd. hfp0 s/,m?

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 fo a 7a(v+bn 6ewv gc,ym+p0xju:r 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 frequenct7sh2 5o qg0ptol0mt5 y of 20 mm microwaves?

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 1. o3ralrvv; z16ls)h2o(1f few0 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 travel 1. f3rv-p m9l)spj; tey*sg e2f)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 loca4jm z wpadw1(+i*sr1w l 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 y yr2lflr56.mt ear (the 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 pulse retucvoi.w4dp 9.l rn as an echo in 20 ms after transmission. cw lpd. i49.voHow 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 atmw0ts s0)g8ezbosphere) at a rate of about0gswt8b )0ze s $1350 \; W/m^{2}$. 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 thw74r-v.vvi9g. zwi yhe Earth (above the atmosphere) at a rate of abou.vw z i-yg.hv7ivwr94t $1350 \; W/m^{2}$. 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 from ps;z9flh 9v*2nl6( tf:2x( yhzoxw t ca 100-W lightsohctzxv62nfz 299 tw(l lf(xp:y; h* 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 magnejfh x+ji y2 w2-xrdp8paxb b,5xa-9)itic field at a distance 2.5 m from a 100-W light bulb?xra,)i+b5yhp2i28 b -j w a9xfxp djx-

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 ip,3p- a t tkeh,voku2-n diameter. What is the average (rms) value of thte -ou, 2,k3tv k-aphpe 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 2.0*gajrwng )ibn6pzq4d:40m ,n k1 1 xc -fmt(el0 mm in diameter. What is the average (r4 (i -n)ladx46 zctjm k1: g*n0qgwn,pfm1berms) value 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 t6 cndjikare rj.5rq:-7pb k):qnfr,,ransported across 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 outx (ge3qk4)fgpn w bla/7lx4c.6 w(nqm put 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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