Find the energy of each of the photons which (i) correspond to light of frequency Hz. (ii) have a wavelength of 0.50 Å.

(i)

The energy of a photon (E) can be calculated by using the following expression:

Where, ‘h’ denotes Planck’s constant, which is equal to  (frequency of the light) = 

Substituting these values in the expression for the energy of a photon, E:

(ii)

The energy of a photon whose wavelength is (\lambda) is:

Where,

h (Planck’s constant) =

c (speed of light) =

Substituting these values in the equation for ‘E’:

E=

∴