: (*)-(2) Find pressure 8. 45 1. For Photon gas given that for phonon gas and discuss and compare it with classical idea

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2 Find Pressure 8 45 1 For Photon Gas Given That For Phonon Gas And Discuss And Compare It With Classical Idea 1 (16.02 KiB) Viewed 44 times

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: (*)-(2) Find pressure 8. 45 1. For Photon gas given that for phonon gas and discuss and compare it with classical ideal gas. Also Deduce condition for isentropic expansion of it.
2. Show that the variation of Black body energy density at large wavelength approaches to Rayleigh-Jeans Law and follows Wein;s Law as a → 0. 3. Expression for Debye specific heat is Cv = (9N/x,')F(X) = 9Nk(1/0)' F(0./T).
hwr 4. In the Einstein approximation U = 30e - 30{17cm. 10+ (exp(hw/kT) - 1] Find Cv and approximate it for very high and very low Temperature.