Question

A photon has an energy of 2.88 x 10^-18 j. convert this energy into ev.

Answer 1

E = V Q voltage * charge

Since the charge on an electron is e = 1.6E-19 coulombs

the energy of 1 eV is 1.6E-19 joules

E = 2.88E-18 joules / 1.6E-19 joules/electron volt

E = 18 eV