Which of the following gives the wave number of a plane electromagnetic wave in terms…

PHYSICS · Single correct · A Level · Physics · Waves · Waves

Problem

Which of the following gives the wave number

k

of a plane electromagnetic wave in terms of its wavelength

\lambda

? (a)

k = \dfrac{1}{\lambda}

(b)

k = \dfrac{\pi}{\lambda}

(c)

k = \dfrac{2\pi}{\lambda}

(d)

k = \dfrac{2}{\lambda}