Thermal and Statistical Physics-Statistical Physics [IAS (Admin.) Mains Physics]: Questions 1 - 5 of 5

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Question 1

Appeared in Year: 2011 (IFS)

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Write down the expression for the Bose – Einstein distribution function and explain the meaning of the symbols used. (Paper-I) (Section - B)

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Question 2

Appeared in Year: 2012 (IFS)

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What are Einstein՚s A and B coefficients? Establish a relation between the. (Section A)

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Explanation

  • There are three Einstein coefficients associated with any pair of energy levels. Of these three only one is independent. The other two dependent upon the coefficient taken to be independent, plus the frequency of the transition and the statistical weight of the two associated terms.
Three Different Emission Coefficient

… (697 more equations, 24 figures) …

Question 3

Appeared in Year: 2011 (IFS)

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Write down the expression for the Bose – Einstein distribution function and explain the meaning of the symbols used. (Section - B)

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Question 4

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Prove that the value of is nearly Hence determine the Fermi temperature of a metal whose Fermi energy is .

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Question 5

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Show that the Fermi velocity is related to the energy of electrons through the relation

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