When It Comes near a Heavy Nucleus,a Gamma Ray,which Is

Multiple Choice

When it comes near a heavy nucleus,a gamma ray,which is a high energy photon,can "disappear," and in its place there will be produced an electron and a positron,which both have mass.This pair production 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.