# A Li2+ ion emitts a photon with a frequency of 6.66 × 1014 Hz. If the energy of the initial state of the Li2+ ion was -7.85 × 10(-19) J, calculate the energy of the final state. Express answer in scientific notation.

Question

A Li2+ ion emitts a photon with a frequency of 6.66 × 1014 Hz. If the energy of the initial state of the Li2+ ion was -7.85 × 10(-19) J, calculate the energy of the final state. Express answer in scientific notation.