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Please do these question in details (6) Use three coupled oscillators to illustrate the concept of phonons. What are acoustic and optical phonons? (8) What

Please do these question in details

(6) Use three coupled oscillators to illustrate the concept of phonons. What are acoustic and optical phonons? (8) What are Debye model and Debye temperature? (9) What is temperature dependence of specific heat of lattice vibration in a crystal at low temperature? (10) Using phonon concept to explain thermal conductivity due to lattice vibration 1 1)W/

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