Why would a photon striking an electron "make both recoil" as I read in an answer to another question. If the photon is massless, how can it make an electron change momentum?
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3$\uparrow$ what other question/answer? – Kyle Kanos Feb 22 '15 at 03:23
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Related (possible/partial dupe): http://physics.stackexchange.com/q/116464/ – dmckee --- ex-moderator kitten Feb 22 '15 at 03:23
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1possible duplicate of If photons have no mass, how can they have momentum? – Kyle Kanos Feb 22 '15 at 03:24
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If the photon is massless, how can it make an electron change momentum?
Because, relativistically, momentum isn't proportional to (invariant) mass?
Thus, particles with zero invariant mass can have non-zero momentum.
Alfred Centauri
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