Arun
Last Activity: 4 Years ago
As learnt
The energy (E) of a quantum of radiation -

Where h is plank’s constant and
is frequency
-
AND
Speed of electromagnetic radiation -

where frequency is (
,pronounced as nu), wavelength is (λ) and velocity of light is(c)
-
We know, 
E= energy of a quantum of radiation
h=plank's constant
frequency of radiation
and 
Now, 

Put in 2
