Physics

Problem

For a photon, the relations

E=hf

and

p=E/c

hold. Eliminating

E

leads to a direct relation between momentum

p

and wavelength

\lambda

. Which of the following correctly gives this relation? a)

p = \dfrac{h}{2\pi \lambda}

p = \dfrac{2 h}{\lambda}

p = \dfrac{h}{\lambda}

p = \dfrac{2\pi h}{\lambda}