Question

What is the approximate velocity of electromagnetic waves in vacuum?

Options

• \[3\times10^3\,\mathrm{m/s}\]

• \[1.5\times10^{11}\,\mathrm{m/s}\]

• \[2.1\times10^{-8}\,\mathrm{m/s}\]

• \[3\times10^8\,\mathrm{m/s}\]

Answer 1

The speed of electromagnetic waves in free space or vacuum is approximately \[3\times10^8\,\mathrm{m/s}\]. It is a fundamental constant.