Which one of the following statements is true, if half-life of a radioactive substance

Which one of the following statements is true, if half-life of a radioactive substance is 1 month?

Options

(a) 7/8th part of the substance will disintegrate in 3 months
(b) 1/8th part of the substance will remain undecayed at the end of 4 months
(c) The substance will disintegrate completely in 4 months
(d) The substance will disintegrate completely in 2 months

Correct Answer:

7/8th part of the substance will disintegrate in 3 months

Explanation:

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