Thermodynamics and Statistical Physics [GATE (Graduate Aptitude Test in Engineering) Physics]: Questions 18 - 22 of 82

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Question 18

Thermodynamics and Statistical Physics

Appeared in Year: 2012

Question

MCQ▾

At a certain temperature T, the average speed of nitrogen molecules in air is found to be . The most probable and the root mean square speeds of the molecules are, respectively –

Choices

Choice (4)Response

a.

b.

c.

d.

Question 19

Thermodynamics and Statistical Physics

Appeared in Year: 2012

Question

MCQ▾

The total energy, of an ideal non – relativistic Fermi gas in three in three dimensions is given by ; where, is the number of particles and V is the volume of the gas. Identify the correct equation of state (P being the pressure) –

Choices

Choice (4)Response

a.

b.

c.

d.

Question 20

Thermodynamics and Statistical Physics

Appeared in Year: 2012

Question

MCQ▾

Which one of the following cannot be explained by considering a harmonic approximation for the lattice vibrations in solids?

Choices

Choice (4)Response

a.

Thermal expansion

b.

Dulong – Petit law

c.

Debye՚s law

d.

Optical branches in lattices

Question 21

Thermodynamics and Statistical Physics

Appeared in Year: 2012

Question

MCQ▾

The isothermal compressibility, of an ideal gas at temperature and volume is given by,

Choices

Choice (4)Response

a.

b.

c.

d.

Question 22

Thermodynamics and Statistical Physics

Appeared in Year: 2012

Question

MCQ▾

A classical gas of molecules, each of mass , is in thermal equilibrium at the absolute temperature, . The velocity component of the molecules along the Cartesian axes are and . The mean value of is –

Choices

Choice (4)Response

a.

b.

c.

d.

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