Question

Velocity of plane electromagnetic waves in vacuum equals ______.

Options

• speed of light in vacuum

• speed of sound

• speed of sonic boom

• speed of subsonic rockets

Answer 1

Velocity of plane electromagnetic waves in vacuum equals speed of light in vacuum.

Explanation:

In fact, light (visible) is a part of em-spectrum. Hence its speed is equal to that of light and in vacuum it is given by `1/sqrt(mu_oepsilon_o)`.