Q.

Select the correct statement about electromagnetic waves.

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a

No medium is required for their propagation.

b

It consists of transverse vibrations produced from a combination of electric and magnetic fields perpendicular to each other.

c

They have different wavelength, velocity and frequency in vacuum.

d

Perpendicular constant electric and magnetic field generates it.

answer is B, D.

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Detailed Solution

Because they are created by shifting magnetic and electric fields, electromagnetic waves don't need a medium to travel in order to be propagated.
When an electric field interacts with a magnetic field, electromagnetic waves are formed. Therefore, they are referred to as "electromagnetic" waves. An electromagnetic wave's electric field and magnetic field are perpendicular to one another (at right angles).

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