If an electron absorbs a photon to get exited to a higher energy level, it should either come back to same state or any other lower state by emitting the required photon. How then can there be a net transfer of energy to the atom? Heating up means increase in kinetic (vibrational) energy of the atoms. If the energy absorbed by a photon is re-emitted as a photon then how do atoms extract energy from incident photons?
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classical mechanics - Moment of a force about a given axis (Torque) - Scalar or vectorial?
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