An electron (q =+e)and a positron (q = +e)can combine to give off two gamma rays.The net change in the algebraic sum of the charges is
A)+2e
B)zero
C)-2e
D)+e
E)-e

Question

Quizplus · Accepted Answer

The electron has a negative charge and the positron has a positive charge, both of magnitude e. When they combine, they annihilate each other and convert their mass into energy, producing two gamma rays. Since the total charge before and after the combination is zero, the net change in the algebraic sum of the charges is also zero.

An Electron (Q =+E)and a Positron (Q = +E)can Combine