An electron and a positron,which are two massive particles,can annihilate when they come together to produce two photons,which have no mass.This pair annihilation is an example of
A)time dilation.
B)length contraction.
C)the equivalence of mass and energy.
D)the principle of relativity.
E)none of the above.

Question

Quizplus · Accepted Answer

The annihilation of an electron and a positron to produce two photons is an example of the equivalence of mass and energy, as predicted by Einstein's famous equation E=mc^2. This equation shows that mass can be converted into energy and vice versa. In this annihilation process, the mass of the two particles is converted entirely into energy in the form of the two photons, which have no mass.

An Electron and a Positron,which Are Two Massive Particles,can Annihilate