photon momentum

Question

Photon momentum p (wavelength λ) is:

RankGuru · Accepted Answer

Photons have zero rest mass, but they possess momentum and energy. 
1. $E = hf$
2. $E = pc$
Equating the two: $pc = hf \implies p = \frac{hf}{c} = \frac{h}{\lambda}$.
This confirms that radiation carries momentum and can exert pressure (Radiation Pressure) when it hits a surface.

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