According to Eisenstein's quantum theory light propagates in the bundles of power, each packet being known as photon and possessing energy.
Energy of photon: Energy of each photon is given by E = hv= hc/λ where c = Speed of light, h = Plank's constant = 6.6 ´ 10-34 J-sec, n = Frequency in Hz, λ = Wavelength of light
Mass of photon: Actually rest mass of the photon is zero. But it's effective volume is define as
E = mc2 = hv => m = E/c2 =hv/c2 =h/cλ. This mass is also known as kinetic mass of the photon
Momentum of the photon: Momentum p = m * c = E/c =hv/c =h/λ
Number of emitted photons: The quantity of photons emitted per second from a source of monochromatic radiation of wavelength l and power P is given as = P/E = P/hv = Pλ/hc; where E = energy of each photon
Intensity of light (I): Energy crossing per unit area normally per second is called intensity or energy flux
i.e. I = E/At = P/A (E/t = P=radiation power)
At a distance r from a position source of energy P intensity is given by 
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