Alpha Question Bank for Engineering: Physics>Chapter 29 - Electromagnetic Waves>Exercise - 1>Q 22

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A flood light is covered with a fitter that transmits red light. The electric field of the emerging beam is represented by a sinusoidal plane wave, $E_{x} = 36 \sin (1.20 \times 10^{7} z - 3.6 \times 10^{15} t) V m^{- 1}$ .

The average intensity of beam in $W m^{- 2}$ will be,

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Important Questions on Electromagnetic Waves

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Alpha Question Bank for Engineering: Physics>Chapter 29 - Electromagnetic Waves>Exercise - 1>Q 24

A point source of electromagnetic radiation has an average power output of

800 W

. The maximum value of the electric field at a distance

4.0 m

from the source is

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Alpha Question Bank for Engineering: Physics>Chapter 29 - Electromagnetic Waves>Exercise - 1>Q 26

A plane electromagnetic wave travelling along the

X

-direction has a wavelength of

3 mm

. The variation in the electric field occurs in the

Y

-direction with an amplitude

66 V m^{- 1}

. The equation for the electric and magnetic fields as a function of

x

and

t

are, respectively.

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Alpha Question Bank for Engineering: Physics>Chapter 29 - Electromagnetic Waves>Exercise - 1>Q 28

Electromagnetic wave can be deflected by

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Alpha Question Bank for Engineering: Physics>Chapter 29 - Electromagnetic Waves>Exercise - 1>Q 29

The magnetic field in a plane electromagnetic wave is given by

B_{y} = 2 \times 10^{- 7} \sin (0.5 \times 10^{3} x + 1.5 \times 10^{11} t)

. This electromagnetic wave is

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Alpha Question Bank for Engineering: Physics>Chapter 29 - Electromagnetic Waves>Exercise - 3>Q 1

Infrared radiation is detected by

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Alpha Question Bank for Engineering: Physics>Chapter 29 - Electromagnetic Waves>Exercise - 3>Q 3

An electromagnetic wave of frequency

ν = 3 M H z

passes from vacuum into a dielectric medium with permittivity

ε = 4 ε_{0}

. Then

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Alpha Question Bank for Engineering: Physics>Chapter 29 - Electromagnetic Waves>Exercise - 3>Q 4

An electromagnetic wave in a vacuum has the electric and magnetic field

\vec{E}

and

\vec{B}

, which are always perpendicular to each other. The direction of polarization is given by

\vec{X}

and that of wave propagation by

\vec{k}

. Then

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Alpha Question Bank for Engineering: Physics>Chapter 29 - Electromagnetic Waves>Exercise - 3>Q 5

The magnetic field in a travelling electromagnetic wave has a peak value of

20 nT

. The peak value of electric field strength is: