I have two questions related to phonon First of all what is phonon? Why its energy is quantized?

put on hold as off-topic by probably_someone, John Rennie, Emilio Pisanty, StephenG, By Symmetry Dec 6 at 19:17

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    I'm voting to close this question as off-topic because it shows insufficient prior research – John Rennie Dec 6 at 17:44
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    Please do not just post homework questions. If there is a specific area that you need help with then ask a specific question. In particular, try to be very precise when asking "why?" questions; what is an example of the sort of explanation that you're looking for? – Eric Lippert Dec 6 at 18:47