Write notes on: Sky wave propagation

Write notes on: Space wave propagation

Write notes on: Ground wave propagation

Write a note on IVF.

The critcal frequency for sky wave propagation if maximum number density of electrons in ionosphere is 10^(10) m_(-3) is

Fill in the blanks with appropriate words and write the complete statements: In……………waves, the particles of the medium vibrate perpendicular to the direction of wave propagation.

Explain ground waves, space waves and sky waves propogation

Assertion : Electromagnetic waves with frequencies more than the critical frequency of ionosphere cannot be used for communication using sky wave propagation. Reason : The refractive index of the ionosphere becomes very high for frequencies higher than the critical frequency .