Question

The speed of electromagnetic waves in air is

• A. $3\times {10}^{5}km/s$
• B. $3\times {10}^{6}km/s$
• C. $3\times {10}^{7}km/s$
• D. $3\times {10}^{8}km/s$

Answer 1

The correct option is A

$3\times {10}^{5}km/s$

Explanation:

1. Electromagnetic waves are those waves that do not require any medium to propagate.
2. Electromagnetic waves like light waves are examples of non-mechanical waves.
3. The speed of the light wave is $3\times {10}^{8}m/sor3\times {10}^{5}km/s$.

Hence, option (a) is correct.