The wave function (in S.I. units) for an electromagnetic wave is given as:
$\psi (x, t) = 10^3 sin\pi (3 \times 10^6 x – 9 \times 10^{14}t)$ , wavelength of the wave is:
Answer & explanation
Correct answer: option 1
Comparing $\psi (x, t) = 10^3 sin\pi (3 \times 10^6 x – 9 \times 10^{14}t)$ with
$\psi (x, t) = a sin\frac{2\pi}{\lambda} (x -vt)$
$\frac{2\pi}{\lambda} = \pi \times 3\times 10^6 $
$ \Rightarrow \lambda = 666nm$