Gamma Question Bank for Medical Physics>Chapter 23 - Electromagnetic Waves>Assignment>Q 8

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A plane electromagnetic wave of frequency $28 MHz$ travels in free space along the positive $x -$ direction. At a particular point in space and time, electric field is $9.3 V m^{- 1}$ along positive $y -$ direction. The magnetic field (in $T$ ) at that point is

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Important Questions on Electromagnetic Waves

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Gamma Question Bank for Medical Physics>Chapter 23 - Electromagnetic Waves>Assignment>Q 9

A plane electromagnetic wave is incident on a plane surface of area

A

normally, and is perfectly reflected. If energy

E

strikes the surface in time

t

then average pressure exerted on the surface is (

c =

speed of light)

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Gamma Question Bank for Medical Physics>Chapter 23 - Electromagnetic Waves>Assignment>Q 26

For a medium with permittivity

ε

and permeability

μ

the velocity of light is given by

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Gamma Question Bank for Medical Physics>Chapter 23 - Electromagnetic Waves>Assignment>Q 27

Which one of the following electromagnetic radiations has the smallest wavelength?

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Gamma Question Bank for Medical Physics>Chapter 23 - Electromagnetic Waves>Assignment>Q 28

If

ε_{0} and μ_{o}

are the electric permittivity and magnetic permeability and the free space and

ε and μ

are the corresponding quantities in a medium, then the index of refraction of the medium is

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Gamma Question Bank for Medical Physics>Chapter 23 - Electromagnetic Waves>Assignment>Q 29

What is the cause of greenhouse effect ?