GATE (Graduate Aptitude Test in Engineering) Physics: Questions 143 - 146 of 659

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Question 143

Appeared in Year: 2012

Question

MCQ▾

Identify the CORRECT energy band diagram for Silicon doped with Arsenic. Here and are conduction band, valence band, impurity level and Fermi level, respectively.

Choices

Choice (4)Response

a.

Conduction, Valence Bands and Impurity, Fermi Levels (Choice A)

b.

Conduction, Valence Bands and Impurity, Fermi Levels (Choice B)

c.

Conduction, Valence Bands and Impurity, Fermi Levels (Choice C)

d.

Conduction, Valence Bands and Impurity, Fermi Levels (Choice D)

Question 144

Appeared in Year: 2012

Question

MCQ▾

Total binding energies of are , and , respectively. The energy gap between and neutron shells for the nuclei whose mass number is close to 16, is –

Choices

Choice (4)Response

a.

b.

c.

d.

Question 145

Appeared in Year: 2012

Question

MCQ▾

Consider a system in the unperturbed state described by the Hamiltonian, . The system is subjected to a perturbation of the form where . The energy eigenvalues of the perturbed system using the first order perturbation approximation are –

Choices

Choice (4)Response

a.

b.

c.

d.

Question 146

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

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