Saturday, January 21, 2017

Mathematical proof of an electron can't absorb a photon



How can we mathematically prove that a free electron can't absorb a photon totally?




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classical mechanics - Moment of a force about a given axis (Torque) - Scalar or vectorial?

I am studying Statics and saw that: The moment of a force about a given axis (or Torque) is defined by the equation: $M_X = (\vec r \times \...