# Thermodynamics and Statistical Physics [GATE (Graduate Aptitude Test in Engineering) Physics]: Questions 14 - 17 of 82

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## Question 14

Appeared in Year: *2012*

### Question

MCQ▾Consider a system whose three energy levels are given by . The energy level is two – fold degenerate and the other two are non – degenerate. The partition function of the system with is given by –

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## Question 15

Appeared in Year: *2012*

### Question

MCQ▾For an ideal Fermi gas in three dimensions, the electron velocity at the Fermi surface is related to electron concentration as,

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## Question 16

Appeared in Year: *2012*

### Question

MCQ▾A paramagnetic system consisting of N spin – half particles, is placed in an external magnetic field. It is found that spins are aligned parallel and the remaining spins aligned antiparallel to the magnetic field. The statistic entropy of the system is –

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## Question 17

Appeared in Year: *2012*

### Question

MCQ▾Inverse susceptibility as a function of temperature, for a material undergoing paramagnetic to ferromagnetic transition is given in the figure, where is the origin. The values of the Curie constant, , and the Weiss molecular field constant, , in CGS units, are –

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