Question

Which set of expressions gives the momentum of a photon?

Options

• \[p=\frac{E}{c}=\frac{h\nu}{c}=h\lambda\]

• \[p=\frac{c}{E}=\frac{c}{h\nu}=\frac{\lambda}{h}\]

• \[p=\frac{E}{c}=\frac{h\nu}{c}=\frac{h}{\lambda}\]

• \[p=Ec=h\nu c=h\lambda\]

Answer 1

Photon momentum is \[p=\frac{E}{c}\]. Using photon energy and wavelength gives the equivalent expressions \[p=\frac{h\nu}{c}=\frac{h}{\lambda}\].