The wave function (in S.I. units) for an electromagnetic wave is given as:
$\psi (x, t) $= 103 sinp (3 x 106x – 9 x 1014t)
The speed of the wave as:
Answer & explanation
Correct answer: option 2
$ c = \frac{\omega}{k} = \frac{9\times 10^{14}}{3\times 10^6} = 3\times 10^8 m/s$