Question

Calculate the energy of a photon having a wavelength of 4.00 x 10-7 meter in air.

Answer 1

E=hf

h = Planck's constant (6,626.10⁻³⁴ Js)

f = c / λ

E= (6,626.10⁻³⁴ x 3 x 10⁸)/4 x 10⁻⁷

E = 4.97 x 10⁻¹⁹ J