Energy (E) of a photon is given by the expression,E = hv
Where, h = Planck’s constant = 6.626 × 10–34 Js
ν = frequency of light = 3 × 1015 Hz
Putting the values in the given expression of E, We get
E = (6.626 × 10–34) (3 × 1015)
E = 1.988 × 10–18 J