What is the time during which one half of a number of radioactive species decays or one half of their activity ceases?

What is the time during which one half of a number of radioactive species decays or one half of their activity ceases?

Q. What is the time during which one half of a number of radioactive species decays or one half of their activity ceases?

1.            Super critical state

2.            Semi life

3.            Critical life

4.            Half Life

Answer: Half Life

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