Quantum Mechanics (CSIR Physical Sciences): Questions 40 - 42 of 71

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Question number: 40

» Quantum Mechanics » Spin-Statistics Connection

Appeared in Year: 2013

MCQ▾

Question

Consider three particles A, B and C each with an attribute S that can take two values ±1. Let SA=1,SB=1 and SC=1 at a given instant. In the next instant, each S value can change to S with probability 13 . The probability that SA+SB+SC remains unchanged is – (June – 2013)

Choices

Choice (4) Response

a.

29

b.

23

c.

49

d.

13

Question number: 41

» 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: 42

» Quantum Mechanics » Elementary Theory of Scattering » Born Approximation

Appeared in Year: 2013

MCQ▾

Question

In the Born approximation, the scattering amplitude f(θ) for the Yukawa potential, V(r)=βrμrr

Is given by, (in the following b=2ksinθ2,E=2k22m ) (June)

Choices

Choice (4) Response

a.

2mβ2(μ2+b2)2

b.

2mβ2(μ2+b2)

c.

2mβ2(μ2+b2)

d.

2mβ2(μ2+b2)3

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