The velocity of electromagnetic wave in free space is given by     Select one:adcb

The velocity of electromagnetic waves in free space is given by the equation:

$c = \frac{1}{\sqrt{\mu_0 \varepsilon_0}}$

where:

• $c$ is the speed of light in a vacuum (approximately $3.00 \times 10^8 \, \text{m/s}$),
• $\mu_0$ is the permeability of free space,
• $\varepsilon_0$ is the permittivity of free space.

In simpler terms, this speed indicates how quickly electromagnetic waves, such as light, travel through a vacuum. Electromagnetic waves consist of oscillating electric and magnetic fields and are fundamentally important in various fields of physics and engineering, including communications, optics, and thermodynamics.

The multiple-choice options (a, b, c, d) seem to refer to specific answers, but without the context of what each option represents, I can't conclusively determine the correct choice. However, if the question pertains directly to the velocity itself, the answer would be the speed of light in a vacuum or $c$.