Question

What is the energy of a photon whose frequency is 2.22 x 10^14 s^-1?

Answer 1

Theenergy of a photon is given by the Planck-Einstein relation:
E = hf
where f is the frequency of the photon and h is Planck's constant (6.626 x 10E-34 J s).
Substituting f = 2.22 x 10E14 s-¹ gives E = 1.47 x10E-19 J (to 3 sf).