An atom absorbs a photon of wavelength 500 nm and emits another photon of wavelength 600 nm. The net energy absorbed by the atom in this process is $\mathrm{n} \times 10^{-4} \mathrm{eV}$. The value of n is _______. [Assume the atom to be stationary during the absorption and emission process] $\left(\right.$ Take $\mathrm{h}=6.6 \times 10^{-34} \mathrm{Js}$ and $\left.\mathrm{c}=3 \times 10^8 \mathrm{~m} / \mathrm{s}\right)$.