During Photoelectric effect and other such phenomenon, when light is made to fall on metal surface, single photon is absorbed by the single electron present in metal atom. Why not 2, 3, 4, or more photons can be absorbed by single electron?
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2multiple absorption is possible in principle, but way less probable. – AccidentalFourierTransform Dec 23 '15 at 11:59
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Why the downvote? It's a duplicate, but it's a perfectly good question. – John Rennie Dec 23 '15 at 12:37
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See: https://physics.stackexchange.com/questions/225255/does-laser-light-with-less-than-the-work-function-still-ionise-some-atoms/225258#225258 – Lewis Miller Dec 23 '15 at 15:32
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Since the advent of high power lasers multiphoton ionization of atoms has become an active area of research. Google with "multiphoton ionization" – Urgje Dec 23 '15 at 16:07