CSIR Physical Sciences: Questions 221 - 223 of 401

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Question number: 221

» Atomic & Molecular Physics » Relativistic Corrections for Energy Levels of Hydrogen Atom

Appeared in Year: 2013

MCQ▾

Question

The energy of an electron in a band as a function of its wave vector k is given by E(k)=E0B(coskxa+coskya+coskza) , where E0,B and a are constants. The effective mass of the electron near the bottom of the band is – (Dec -2013)

Choices

Choice (4) Response

a.

23Ba2

b.

223Ba2

c.

22Ba2

d.

2Ba2

Question number: 222

» Quantum Mechanics » Elementary Theory of Scattering » Phase Shifts

Appeared in Year: 2014

MCQ▾

Question

A double slit interference experiment uses a laser emitting light of two adjacent frequencies ν1 and ν2(ν1<ν2) . The minimum path difference between the interfering beams for which the interference pattern disappears is – (June -2014)

Choices

Choice (4) Response

a.

c2(v2+v1)

b.

cv2+v1

c.

cv2v1

d.

c2(v2v1)

Question number: 223

» Thermodynamic and Statistical Physics » Thermodynamic Potentials

Appeared in Year: 2014

MCQ▾

Question

A Carnot cycle operates as a heat engine between two bodies of equal heat capacity until their temperature become equal. If the initial temperature of the bodies are T1 and T2 , respectively, and T1>T2 , then their common final temperature is – (Dec– 2013)

Choices

Choice (4) Response

a.

12(T1+T2)

b.

T22T1

c.

T12T2

d.

T1T2

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