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# Electromagnetic Waves Test 01 Class 12 Notes | EduRev

## Class 12 : Electromagnetic Waves Test 01 Class 12 Notes | EduRev

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CBSE TEST PAPER-01
CLASS - XII PHYSICS (Electro magnetic waves)
1.
What is the role of ozone in the atmosphere?

2.
What is the nature of waves used in radar?

3.
Write the application of Infra-red radiations?

4.
Which constituent radiation of the electromagnetic spectrum is used?
(1) To photograph internal parts of human body.

5.
Electric field in a plane electromagnetic wave is given by
E Z = 60 sin
( )
3
11
10 3
10 / .
2 2
x t
V m
? ?
+
? ?
? ?

(a) Write an expression for the magnetic field
(b) What is the magnitude of wavelength and frequency of the wave?

6.
In a plane electromagnetic wave, the electric field oscillates sinusoid ally with a
frequency of 2 × 10
10
Hz and amplitude 48V/m.
(a) What is the wavelength of the em. wave?
(b) Calculate the amplitude of the oscillating magnetic field.
(c) Calculate average energy density of the electromagnetic field of the wave?

7.
Find the wavelength of electromagnetic waves of frequency 6 × 10
12
Hg in free
space. Give two applications?

8.
A plane monochromatic wave lies in the visible region. It is represented by the
sinusoidal variation with time by the following components of electric field
Ex = 0, Ey = 4 sin ( )
2
, x vt
p
?
? ?
- ? ?
? ?
Ez = 0
Where ? = 5 × 10
14
Hg  And ? is the wavelength of light.
(a) What is the direction of propagation of the wave?
(b) What is its amplitude?
(c) Compute the component of magnetic field?

9.
Write the characteristics of em waves? Write the expression for velocity of
electromagnetic waves in terms of permittivity and permeability of the
medium?

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