Robert S. answered • 04/10/14

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Robert Math Physics

for light E=pc

where E is the energy of the photon (light)

p is the momentum and c is the speed of light

since light waves have a wavelength or frequency associated with it

using planks equation E= hf f is the frequency and h is planks constant

the momentum in terms of frequency is p = hf/c

using c = lf where l is the wavelength then p = h/l

a photon can strike and move an electron using the momentum above