CSIR Physical Sciences: Questions 341 - 344 of 401

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Passage

Consider the decay process τπ+ντ , in the rest frame of τ. The masses of τ,π and ντ and Mτ,Mπ are zero respectively. (June)

Question number: 341 (1 of 2 Based on Passage) Show Passage

» Nuclear and Particle Physics » Relativistic Kinematics

Appeared in Year: 2011

MCQ▾

Question

The velocity of π is –

Choices

Choice (4) Response

a.

MπcMr

b.

MrcMπ

c.

(Mr2+Mπ2)cMr2Mπ2

d.

(Mr2Mπ2)cMr2+Mπ2

Question number: 342 (2 of 2 Based on Passage) Show Passage

» Nuclear and Particle Physics » Relativistic Kinematics

Appeared in Year: 2011

MCQ▾

Question

The energy of π is

Choices

Choice (4) Response

a.

(MrMπ)c2

b.

(Mτ2Mπ2)c22Mτ

c.

MτMπc2

d.

(Mr2+Mπ2)c22Mτ

Question number: 343

» Quantum Mechanics » Variational Method

Appeared in Year: 2011

MCQ▾

Question

The wave function of the particle at time t=0 is given by ψ(0)=12( u1+ u2) , where u1 and u2 are the normalized eigen states with eigen values E1 and E2 respectively, (E2>E1) . The shortest time after which ψ(t) will become orthogonal to ψ(0) is – (December)

Choices

Choice (4) Response

a.

πE2E1

b.

2πE2E1

c.

π2(E2E1)

d.

2πE2E1

Question number: 344

» Thermodynamic and Statistical Physics » Bose-Einstein Condensation

Appeared in Year: 2011

MCQ▾

Question

Consider an ideal Bose gas in three dimensions with the energy – momentum relation εps with s>0 . The range of s for which this system may undergo a Bose – Einstein condensation at a non- zero temperature is – (June)

Choices

Choice (4) Response

a.

0<s<2

b.

1<s<3

c.

0<s<

d.

0<s<3

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