An excited electron in an atom drops from an energy of to

PHYSICS · Subjective · CBSE · Physics · Atoms · Atoms

Problem

An excited electron in an atom drops from an energy of

-2.0\times10^{-19}\,\text{J}

-5.0\times10^{-19}\,\text{J}

. Determine the frequency of the photon emitted. Give your answer in hertz using scientific notation to two significant figures. Constant:

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