State six characteristics of electromagnetic waves. What is Greenhouse effect ?

Explanation

Characteristics of electromagnetic waves :
l) Electromagnetic waves are produced by accelerated charges.
2) Electromagnetic waves are transverse in nature.
3) Electromagnetic waves donot require material medium for their propagation.
4) Electromagnetic waves obey principle of superposition of waves.
5) Velocity of E.M waves in vaccum depends on permittivity and permeability of free space.
6) Electromagnetic waves carry energy and momentum. Electromagnetic waves exert pressure when they strike a surface.