Practice question

A \(\sqrt 2 \times {10^8}\;m{s^{ - 1}}\) B \(\sqrt 3 \times {10^8}\;m{s^{ - 1}}\) Correct C \(2 \times {10^8}\;m{s^{ - 1}}\) D \(3 \times {10^8}\;m{s^{ - 1}}\)