^Energy of photons
Max plank suggested that any source of radiation emits or absorbs energy discontinuously in the form of energy particles or packets of energy called photons. Amount of energy of an EM wave of frequency f possessed by a single photon is,
Total energy of EM wave having N photons is
E = Nhf.
Here h is Planck’s constant. It’s value is
h = 6.63 x 10–34 Js = 4.14 x 10–15 eVs
Dimensions of Planck’s constant & angular momentum are same & are [ML2 T – 1].