What is the frequency of a photon whose energy is 66.3 eV?

Explanation

Here E = 66.3 e V = `66.3 xx 1.6 xx 10^(-19) J`
Frequency v = `E/h = (66.3 xx 1.6 xx 10^(-19))/(6.63 xx 10^(-34)) = 1.6 xx 10^16 Hz`