If a photon has a wavelength of 580.5 nm, what is the energy of the photon (in J)?

Answer 1

E = hc/λ

E = energy = ?

h = Planks constant = 6.626x10^-34 Js

c = speed of light = 3x10⁸ m/s

λ = wavelength = 580.5 nm = 580.5x10^-9 m (change to m to be consistent with units of c)

E = (6.626x10^-34 Js)(3x10⁸ m/s) / 580.5x10^-9 m

E = 3.42x10^-19 J