Question

State whether the following statement is True or False.

Velocity of e.m. waves in vacuum is \(3 \times 10^{5}\) \(\mathrm{kms}^{-1}\).

Answer 1

This statement is true.

Explanation:

• All electromagnetic waves travel with the same speed in vacuum.
• 3 × 10⁵ km/s equals 3 × 10⁸ m/s, which is the speed of light in free space.
• Hence, the velocity of e.m. waves in vacuum is 3 × 10⁵ km/s.