   Chapter 33, Problem 7CQ

Chapter
Section
Textbook Problem

Massless particles must travel at the speed of light, while others cannot reach this speed. Why are all massless particles stable? If evidence is found that neutrinos spontaneously decay into other particles, would this imply they have mass?

To determine

The reason for the stability of mass less particles and the validation of the given statement that is neutrinos have mass if they spontaneously decay into other particles.

Explanation

Introduction:

The mass less particles do not possess sub structures. The speed of these particles is equivalent to the speed of light. The neutrino is the subatomic particle having a mass near to zero.

The magnitude of invariant mass of mass less particles is zero. However, they possess some relativistic mass. The change in mass of a body due to a change in speed of light is referred to as relativistic mass. All mass less particles are stable in nature due to the conservation of energy and momentum.

It is known that if mass less particles get broken to form two new particles, then the invariant mass of new particles will be zero...

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