This can be solve using the Planck-Einstein Equation
Also known as Planck's Relation, the energy of a photon is given by:
E=hf
, where:
E = Energy (J)
h = Planck's Constant (J*s)= 6.626070040(81)×10−34 Js
f = Frequency (Hz)= 2.09 Hz
E=1.3848*10-33 J
