Nuclear and Particle Physics [GATE (Graduate Aptitude Test in Engineering) Physics]: Questions 47 - 53 of 53

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Question 47

Nuclear and Particle Physics

Appeared in Year: 2006

Question

MCQ▾

The interaction potential between two quarks, separated by a distance inside a nucleon, can be described by (a, b and are positive constants) –

Choices

Choice (4)Response

a.

b.

c.

d.

Question 48

Nuclear and Particle Physics

Appeared in Year: 2006

Question

MCQ▾

Weak nuclear forces act on –

Choices

Choice (4)Response

a.

All charged particles

b.

All particles

c.

d.

Question 49

Nuclear and Particle Physics

Appeared in Year: 2017

Question

MCQ▾

In the nuclear reaction , the particle is:

Choices

Choice (4)Response

a.

an electron

b.

an anti – electron

c.

a muon

d.

a pion

Question 50

Nuclear and Particle Physics

Appeared in Year: 2017

Describe in Detail

Essay▾

The atomic mass and mass density of Sodium are and , respectively. The number density of valence electron is . (Up to two decimal places) (Avogadro number, )

Explanation

The number density of valence electrons is,

Where, is the valency.

is the mass density

is the atomic mass

According to question, for sodium;

Question 51

Nuclear and Particle Physics

Appeared in Year: 2017

Describe in Detail

Essay▾

Consider a 2 – dimensional electron gas with a density of . The Fermi energy of the system is (up to two decimal places) .

Explanation

The Fermi – energy of 2 – dimensional electron gas with a density of is given as,

… (2 more words) …

Question 52

Nuclear and Particle Physics

Appeared in Year: 2017

Describe in Detail

Essay▾

The decays at rest to and . Assuming the neutrino to be massless, the momentum of the neutrino is . (up to two decimal places)

Explanation

The process of decay of is given as,

Here, a pion at rest decays into and . Therefore momentum of the pion is zero.

Now, according to conservation of energy,

And according to conservation of momentum,

Negative sine indicate, momentum of muon and that of neutrino are in opposite direction to each other.

Now, energies of particles: pion, muon and neutri…

… (8 more words) …

Question 53

Nuclear and Particle Physics

Appeared in Year: 2017

Question

MCQ▾

Which one of the following conservation laws is violated in the decay ?

Choices

Choice (4)Response

a.

Angular momentum

b.

Total Lepton number

c.

Tau number

d.

Electric charge

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