Physics

Problem

A photon in vacuum has an energy of

2.50\,\text{eV}

. Given

h = 6.63\times10^{-34}\,\text{J\,s}

c = 3.00\times10^{8}\,\text{m\,s}^{-1}

, and

1\,\text{eV} = 1.60\times10^{-19}\,\text{J}

, calculate its wavelength in nanometres to three significant figures.