# Nuclear and Particle Physics-Conservation Laws (GATE (Graduate Aptitude Test in Engineering) Physics): Questions 1 - 5 of 5

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## Question number: 1

» Nuclear and Particle Physics » Conservation Laws

Appeared in Year: 2015

MCQ▾

### Question

The decay is forbidden, because it violates –

### Choices

Choice (4) Response

a.

Baryon and lepton number conservation

b.

Angular momentum conservation

c.

Momentum and lepton number conservations

d.

Lepton number conservation

## Question number: 2

» Nuclear and Particle Physics » Conservation Laws

Appeared in Year: 2007

MCQ▾

### Question

The strangeness quantum number is conserved in –

### Choices

Choice (4) Response

a.

weak and electromagnetic interaction only

b.

strong, weak and electromagnetic interactions

c.

strong and electromagnetic interaction only

d.

strong and weak interactions only

## Question number: 3

» Nuclear and Particle Physics » Conservation Laws

Appeared in Year: 2008

MCQ▾

### Question

A neutral pi meson has a rest – mass of approximately and a lifetime of . A produced in the laboratory is found to decay after into two photons. Which of the following sets represents a possible set of energies of the two photons as seen in the laboratory?

### Choices

Choice (4) Response

a.

b.

c.

d.

## Question number: 4

» Nuclear and Particle Physics » Conservation Laws

Appeared in Year: 2017

Essay Question▾

### Describe in Detail

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 opp

… (83 more words) …

## Question number: 5

» Nuclear and Particle Physics » Conservation Laws

Appeared in Year: 2017

MCQ▾

### Question

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

### Choices

Choice (4) Response

a.

Tau number

b.

Angular momentum

c.

Total Lepton number

d.

Electric charge

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