I think trace 1 is ac and trace 2 if dc but i’m not sure what will happen when a higher frequency is added?
Using Planck's equation,
E = nhc / λ
Also, Power = Energy / time
E = 20 x 10⁻³ x 60 x 60
E = 108 J
108 = (2.29 x 10²⁰ x 6.63 x 10⁻³⁴ x 3 x 10⁸) / λ
λ = 4.22 x 10⁻⁷ m