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What effect does a light ray cause on an electron to make it excited. How a electron absorb energy?

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  • $\begingroup$ My question is how a electron get excited from a proton or light ray $\endgroup$ – Rithik Jul 13 '17 at 18:15
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It is not an electron, but the atom it is associated with that absorbs energy. A free electron is incapable of absorbing a photon due to the requirements of energy and momentum conservation. In an atom, however, an electron can absorb a photon and jump from one bound state to another (or leave the atom completely).

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  • $\begingroup$ But how a electron can absorb energy $\endgroup$ – Rithik Jul 13 '17 at 17:55

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