Question

How do you calculate the energy of a photon of electromagnetic radiation?

Answer 1

`E=hf`

Explanation:

A photon is a particle of light, but light has a dual nature, so it also has a corresponding wavelength and frequency.

We may find the frequency if we know the wavelength, since it travels at the speed of light, so we may use `c=flambda`.

Once we know the frequency, we may multiply it by Planck's constant to find its energy, which is then quantized, as it occurs in discrete multiples of Planck's constant `h=6.6xx10^(-34)J`, and the enrgy is given hence by
`E=hf`