CSIR Physical Sciences: Questions 261 - 263 of 401

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Question number: 261

» Nuclear and Particle Physics » Quark Model

Appeared in Year: 2014

MCQ▾

Question

In a classical model, a scalar (spin-0) meson consists of a quark and an antiquark bound by a potential, V(r)=ar+br Where a=200MeVfm1 and b=100MeVfm . If the messes of the quark and antiquark are negligible, the mass of the meson can be estimated as approximately – (June – 2014)

Choices

Choice (4) Response

a.

353MeVc2

b.

425MeVc2

c.

283MeVc2

d.

141MeVc2

Question number: 262

» Quantum Mechanics » Elementary Theory of Scattering » Born Approximation

Appeared in Year: 2014

MCQ▾

Question

An electron is in the ground state of a hydrogen atom. The probability that it is within the Bohr radius is approximately equal to – (June – 2014)

Choices

Choice (4) Response

a.

0.32

b.

0.90

c.

0.60

d.

0.16

Question number: 263

» Quantum Mechanics » Pauli Exclusion Principle

Appeared in Year: 2013

MCQ▾

Question

Consider two different systems each with three identical non – interacting particles. Both have single particle states with energies ε0 , 3ε0 and 5ε0,(ε0>0) . One system is populated by spin 12 fermions and the other by bosons. What is the value of EFEB , where EF and EB are the ground state energies of the fermionic and bosonic system respectively? (June)

Choices

Choice (4) Response

a.

2ε0

b.

6ε0

c.

4ε0

d.

ε0

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