Energi Foton Tolong ya

λ = 2,5 x 10^-7 m
v = c = 3 x 10^8 m/s
h (tetapan Planck) = 6,6 x 10^-34 Js

E = (h v) / λ
E = (6,6 x 10^-34 x 3 x 10^8)/ (2,5 x 10^-7)
E = 7,92 x 10^-19 Joule