State Maxwell's theory of electromagnetic waves is related to light. Write down four characteristics of electromagnetic waves.

Hint :
We can know about Maxwell's theory if we properly interpret Maxwell's equation.
All electromagnetic waves contain electric field & magnetic field oscillation with propagation wave vector \[\left( {\vec k} \right)\]

Complete Step by step Solution:

As per maxwell, light waves have changing E \[\left( {Electric} \right){\text{ }}and{\text{ }}B\left( {magnetic} \right)\]
fields.
Changing electric field comes with varying space and time components of the magnetic field.
Changing magnetic field comes with varying space and electric components of the electric field.
The change \[\vec E\] and \[\vec B\] with a fixed wave vector \[\vec u\] can also travel in vacuum without the need for medium.
The four characteristics of electromagnetic wave :
(i) \[E.M\]. waves travel at almost the speed of light in different medians.
(ii) \[E.M\]. waves have mutually varying electric and magnetic fields both parabasis to each other.
(iii) \[E.M\]. waves have fixed amplitude and frequency and a fixed wave vector \[\vec k\]

Note: All \[\vec E,\,\,\vec B\,\,\& \,\,\vec u\] are perpendicular to each other. Electric field \[\left( {\vec E} \right)\] amplitude is always more than magnetic field \[\left( {\vec B} \right)\]