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Feb 12, 2015 at 4:44 comment added anna v @AlokSubedi At the level of individual electrons bound states one cannot talk of velocity in a classical model way. We can deduce a velocity from the energy assuming a classical model, but it is a wrong model . The photon does not meet the electron but the whole atom/lattice. The only constraints are conservation of total energy , momentum and angular momentum for the total interaction, and it is a quantum mechanical interaction.
Feb 12, 2015 at 4:03 comment added Alok Subedi ok..lets talk about velocity... the velocity of electron is tangential to the revolution..so now does the kinetic energy of electron depend on the direction of incident photon....?...coz if photon are incident in exactly opposte direction of electrons....the electron should be even forced inside the metal!
Feb 12, 2015 at 3:36 history answered Floris CC BY-SA 3.0