Electromagnetic Waves-Applications of Electromagnetic Waves (NEET (NTA)-National Eligibility cum Entrance Test (Medical) Physics): Questions 1 - 5 of 7

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Question number: 1

» Electromagnetic Waves » Applications of Electromagnetic Waves

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Question

If λ ν , λ x and λ m represent the wavelength of visible light, x-rays, and microwaves respectively, then

Choices

Choice (4) Response

a.

b.

c.

d.

Question number: 2

» Electromagnetic Waves » Applications of Electromagnetic Waves

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In an EM wave the amplitude of electric field is 10 V/m. The frequency of wave is 5 x 10 4 Hz. The wave is propagating along Z-axis. Then the average energy density of magnetic field is-

Choices

Choice (4) Response

a.

2 x 10 -10 J/m 3

b.

2.21 x 10 -8 J/m 3

c.

2.21 x 10 -10 J/m 3

d.

2 x 10 -8 J/m 3

Question number: 3

» Electromagnetic Waves » Applications of Electromagnetic Waves

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Which of the following pairs of space and time varying E and B fields would generate a plane electromagnetic wave travelling in (-Z) direction?

Choices

Choice (4) Response

a.

E Z, B Y

b.

E Y, B X

c.

E X, B Y

d.

E X, B Z

Question number: 4

» Electromagnetic Waves » Applications of Electromagnetic Waves

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Choose the wrong statement for E. M. wave.

Choices

Choice (4) Response

a.

They are transverse

b.

They travel in vacuum with the speed of light

c.

They are produced by accelerated charges

d.

They travel with same speed in all medium

Question number: 5

» Electromagnetic Waves » Applications of Electromagnetic Waves

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If TV signals are to b received by the ground waves with in a range D, the height of the TV tower should be, (R is the radius of earth)

Choices

Choice (4) Response

a.

b.

c.

d.

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