What is half life?

What is half life?Half-life is the period of time it takes for a substance undergoing decay to decrease by half. The name originally was used to describe a characteristic of unstable atoms (radioactive decay), but may apply to any quantity which follows a set-rate decay.

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Why do particles and anti-particles, when they come in contact, annihilate each other?

For sub-atomic particles like electrons and protons, there exist corresponding particles with the same mass …

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