CSIR (Council of Scientific & Industrial Research) Physical Sciences: Questions 250 - 252 of 463

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Question number: 250

» Quantum Mechanics » Timeindependent Perturbation Theory and Applications

Appeared in Year: 2013

MCQ▾

Question

Consider a two – dimensional infinite square well,

Equation

Its normalized eigenfunction are; Equation

Where, Equation If a perturbation Equation is applied, then the correction to the energy of the first excited state to order Equation is – (June – 2013)

Choices

Choice (4) Response

a.

Equation

b.

Equation

c.

Equation

d.

Equation

Question number: 251

» Electronics and Experimental Methods » Device Structure

Appeared in Year: 2013

MCQ▾

Question

A sample of Equation has electron and hole motilities of Equation and Equation respectively at Equation . It is doped with P and Al with doping densities of Equation and Equation respectively. The conductivity of the doped Equation sample at 300 K is – (Dec– 2013)

Choices

Choice (4) Response

a.

Equation

b.

Equation

c.

Equation

d.

Equation

Question number: 252

» Electronics and Experimental Methods » Filtering and Noise Reduction

Appeared in Year: 2013

MCQ▾

Question

The input to a lock – in amplifier has the from Equation where Equation are the amplitude, frequency and phase of the input signal respectively. This signal is multiplied by a reference signal of the same frequency Equation , amplitude Equation and phase Equation . If the multiplied signal is fed to a low pass filter of cut – off frequency Equation , then the final output signal is –

(June)

Choices

Choice (4) Response

a.

Equation

b.

Equation

c.

Equation

d.

Equation

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