Home
Class 12
PHYSICS
Electromagnetic waves with frequency gre...

Electromagnetic waves with frequency greater than the critical frequency of ionosphere cannot be used for communication using sky wave propagation, because:

A

The refractive index of lonosphere becomes very high for `f gt f_(c)`

B

The refractive index of ionosphere becomes very low for `f gt f_(c)`

C

The refractive index of ionosphere becomes very high for `f lt f_(c)`

D

The refractive index of ionosphere becomes very low for `f lt f_(c)`

Text Solution

Verified by Experts

The correct Answer is:
A
Promotional Banner

Similar Questions

Explore conceptually related problems

Statement-I : Electromagnetic waves with frequencies smaller than the critical frequency of ionosphere cannot be used for communication using sky wave propagation Statement-II : The refractive index of the ionosphere becomes very high for frequency.

Statement-1 : Electromagnetic waves with frequencies smaller than the critical frequency of ionosphere cannot be used for communications using sky wave propagation. Statement-2: The refractive index of the ionosphere becomes very high for frequencies higher than the critical frequency.

Sky wave propagation is used in

The electromagnetic waves of frequency 80 MHz and 200 MHz

Electromagnetic wave cannot be produced by

The electromagnetic waves of frequency range 100 to 300 GHz are used in

Electromagnetic waves propagate in the direction parallel to the vector

Name any two, electromagnetic waves, which have a frequency higher than that of violet light. State one use of each.

The electromagnetic waves used in the telecommunication are

Which of the following frequencies will be suitable for beyond-the-Zorizon communication using sky waves ?