a) Photons

a) the particulate nature (photon model) of electromagnetic radiation

b) photon as a quantum of energy of electromagnetic radiation 

c) energy of a photon; E = hf and E = hc/λ

photon = a quantum of energy of EM radiation

  • EM radiation has a particulate nature

Planck constant = 6.63 × 10-34Js

E = hf

  • energy of a photon (J) = Planck constant (J) × frequency of the EM radiation (Hz)

E = hc/λ

  • energy of a photon (J) = ( Planck constant (J) × speed of light (ms-1) ) / wavelength of the EM radiation (m)