Thermodynamic and Statistical Physics (CSIR Physical Sciences): Questions 34 - 37 of 56

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Question number: 34

» Thermodynamic and Statistical Physics » Ising Model

Appeared in Year: 2013

MCQ▾

Question

Consider a system of two Ising spins S1 and S2 taking values ±1 with interaction energy given by ε=JS1S2 , when it is in thermal equilibrium at temperature T. For large T, the average energy of the system varies as CkBT , with C given by,

Choices

Choice (4) Response

a.

2J2

b.

J2

c.

J2

d.

4J

Question number: 35

» Thermodynamic and Statistical Physics » Bose-Einstein Condensation

Appeared in Year: 2014

MCQ▾

Question

The recently discovered Higgs boson at the LHC experiment has a decay mode into a photon and a Z boson. If the rest masses of the Higgs and Z boson are 125GeVc2 and 90GeVc2 respectively, and the decaying Higgs particle is at rest, the energy of photon will approximately be – (June – 2014)

Choices

Choice (4) Response

a.

15GeV

b.

30GeV

c.

353GeV

d.

35GeV

Question number: 36

» Thermodynamic and Statistical Physics » Planck's Distribution Law

Appeared in Year: 2013

MCQ▾

Question

Let u be a random variable uniformly distributed in the interval [0, 1] and V=clnu , where c is a real constant. If V is to be exponentially distributed in the interval [0,) with unit standard deviation, then the value of c should be – (June)

Choices

Choice (4) Response

a.

12

b.

-1

c.

1

d.

ln2

Question number: 37

» Thermodynamic and Statistical Physics » Fermi Gases

Appeared in Year: 2014

MCQ▾

Question

The pressure of a nonrelativistic free Fermi gas in three – dimension depends, at T=0 , on the density of fermions n as. (June – 2014)

Choices

Choice (4) Response

a.

n53

b.

n13

c.

n23

d.

n43

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