Characteristics of electromagnetic waves.
(I) They do not require any material medium for their propagation
(II) The oscillations of vector E and vector B are perpendicular to each other and are in same phase
(III) They are transverse in nature
(IV) They travel through vacuum with same speed, c = 3 × 108ms–1.
(i) Radiowaves are used
(a) in radiotransmission
(b) in radioastronomy
(ii) Microwaves are used
(a) in microwave-ovens
(b) in radar systems
