Momentum Of Photon Formula

Momentum Of Photon Formula is



p = photon momentum

h =Plank’s constant

λ = photon’s wavelength

Photon momentum is comparatively small value to measure.

An electron with the same momentum has a 1460 m/s velocity, which is non relativistic.

To find photon Energy

\(E=\frac{hc}{\lambda }\)


E = photon energy

h = Planck’s constant (6.626×10−34 Js)

c = speed of the light

λ = wavelength of the light

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Practise This Question

In an exothermic reaction AB, the activation energy of reverse reaction is twice that of forward reaction. If enthalpy of the reaction is -80 kJ mol1, the activation energy of the reverse reaction is :

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