cse โข paper_2 โข quantum_mechanics
[UPSC CSE 1991] Foundations of Quantum Mechanics (Q92, 30M)
A photon of energy 10\text{ eV} is scattered by an electron having an initial velocity of 1000\text{ km s}^{-1}. After the scattering the electron velocity is reduced to 200\text{ km s}^{-1}. Deduce the energy of the scattered photon.
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