Physics Question on Nuclear physics

Question

Which one of the following has the same mass as that of electron:

Answer 1

Solution

The positron has same mass $9.1\times {{10}^{-31}}kg$ as that of electron. The magnitude of charge in both electron and positron is $1.6\times {{10}^{-19}}C$ .

Positron, which is a subatomic particle and is referred to as the antimatter counterpart of an electron. The mass of a positron is equal to that of an electron but has a positive electric charge. They have the properties that are opposite to that of the electrons. When an electron and positron encounter each other they release energy in the form of gamma rays. It is used in medical imaging.

so, the correct answer is (B): positron