Assertion :- If the half-life of a radioactive substance is 40 days...

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Assertion :- If the half-life of a radioactive substance is 40 days, then \( 25 \% \) substance left 80
\( \mathrm{P} \) days.

W
- Reason :- \( \mathrm{N}=\mathrm{N}_{0}\left(\frac{1}{2}\right)^{\mathrm{n}} \) where \( \mathrm{n}=\frac{\text { time elapsed }}{\text { half-life period }} \)
(1) A
(2) B
(3) \( \mathrm{C} \)
(4) D
(A) Both assertion and reason are correct statements, and reason is the correct explanation of the assertion.
(B) Both assertion and reason are correct statements, but reason is not the correct explanation of the assertion.
(C) Assertion is correct, but reason is wrong statement.
(D) Assertion is wrong, but reason is correct statement.
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