GATE (Graduate Aptitude Test in Engineering) Physics: Questions 236 - 239 of 622

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Question number: 236

» Quantum Mechanics » Linear Vectors and Operators in Hilbert Space

Appeared in Year: 2013

Short Answer Question▾

Write in Short

A spin – half particle is in a linear superposition Equation of its spin – up and spin – down states. If Equation and Equation are the eigenstate of Equation then what is the expectation value, up to one decimal place, of the operator Equation ? Here, symbols have their usual meaning.

Question number: 237

» Electronics » Semiconductor Devices

Appeared in Year: 2011

MCQ▾

Question

For an intrinsic semiconductor, Equation are respectively the effective masses of electrons and holes near the corresponding band edges. At a finite temperature, the position of the Fermi level –

Choices

Choice (4) Response

a.

Depends on both Equation and Equation

b.

Depends on Equation but not on Equation

c.

Depends neither on Equation nor on Equation

d.

Depends on Equation but not on Equation

Question number: 238

» Nuclear and Particle Physics » Liquid Drop Model » Semi-Empirical Mass Formula

Appeared in Year: 2011

MCQ▾

Question

The semi – empirical mass formula for the binding energy of nucleus contains a surface correction term. This term depends on the mass number A of the nucleus as –

Choices

Choice (4) Response

a.

Equation

b.

Equation

c.

Equation

d.

Equation

Question number: 239

» Solid State Physics » Elements of Crystallography

Appeared in Year: 2013

MCQ▾

Question

A lattice has the following primitive vectors Equation : Equation . The reciprocal lattice corresponding to the above lattice is –

Choices

Choice (4) Response

a.

BCC lattice with cube edge of Equation

b.

FCC lattice with cube edge of Equation

c.

BCC lattice with cube edge of Equation

d.

FCC lattice with cube edge of Equation

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