Thermodynamics and Statistical Physics [GATE (Graduate Aptitude Test in Engineering) Physics]: Questions 48 - 54 of 82

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Question 48

Thermodynamics and Statistical Physics

Appeared in Year: 2009

Question

MCQ▾

The probability that an energy level at a temperature is unoccupied by a fermion of chemical potential is given by,

Choices

Choice (4)Response

a.

b.

c.

d.

Question 49

Thermodynamics and Statistical Physics

Appeared in Year: 2009

Question

MCQ▾

For a Fermi gas of particles in three dimensions at , the Fermi energy, is proportional to –

Choices

Choice (4)Response

a.

b.

c.

d.

Passage

Consider a two level quantum system with energies and .

Question 50 (1 of 2 Based on Passage)

Thermodynamics and Statistical Physics

Appeared in Year: 2009

Question

MCQ▾

The Helmholtz free energy of the system is given by,

Choices

Choice (4)Response

a.

b.

c.

d.

Question 51 (2 of 2 Based on Passage)

Thermodynamics and Statistical Physics

Appeared in Year: 2009

Question

MCQ▾

The specific heat of the system is given by,

Choices

Choice (4)Response

a.

b.

c.

d.

Question 52

Thermodynamics and Statistical Physics

Appeared in Year: 2007

Question

MCQ▾

The vapor pressure (in of ) of a solid, at temperature , is expressed by and that of its liquid phase by . The triple point (in Kelvin) of the material is –

Choices

Choice (4)Response

a.

185

b.

200

c.

195

d.

190

Question 53

Thermodynamics and Statistical Physics

Appeared in Year: 2008

Question

MCQ▾

The radial wave function of the electrons in the state of and in a hydrogen atom is is the Bohr radius. The most probable value of for an electron is –

Choices

Choice (4)Response

a.

b.

c.

d.

Question 54

Thermodynamics and Statistical Physics

Appeared in Year: 2008

Question

MCQ▾

A photon gas is at thermal equilibrium at temperature . The mean number of photons in an energy state is –

Choices

Choice (4)Response

a.

b.

c.

d.

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