What is Photon?
An elementary particle, the smallest unit of light and energy of electromagnetic radiation. Photon is indivisible and has properties of both wave and particle. The longer the wavelength of light the lower the energy of photon is. Thus, short UV light wavelengths have higher-energy photons than infrared light. Photovoltaic cells can capture photons of both visible and invisible light spectrum. The photons that have not been captured are either converted into hear or reflected. The photon energy is the product of the radiation frequency and Planck constant: E = hf.