Question
Question: If an electron and a positron annihiliate, then the energy released is....
If an electron and a positron annihiliate, then the energy released is.
A
3.2×10−13J
B
1.6×10−13J
C
4.8×10−13J
D
6.4×10−13J
Answer
1.6×10−13J
Explanation
Solution
Mass of electron = mass of positron = 9.1 × 10-31kg
Energy released E=(2m).c2
=2×9.1×10−31×(3×108)2= 1.6 × 10–13J.-31—31—