NEET 2023 Physics Radioactive Decay MCQ Question with Solution

The half life of a radioactive substance is 20 minutes. In how much time, the activity of substance drops to (1/16)^th of its initial value?

A

40 minutes

B

60 minutes

C

80 minutes

D

20 minutes

Correct Answer

Option C

Detailed Explanation

To drop to $\frac{1}{16}$ of its initial value, the substance must go through four half-lives (since $\left( \frac{1}{2} \right)^4 = \frac{1}{16}$ ). Each half-life is 20 minutes, so 4 half-lives take 80 minutes.

Found an issue with this question?

Explore More Questions

All Physics Questions Nuclei Questions NEET 2023 PYQ

NEET 2023 Physics Radioactive Decay MCQ Question

Correct Answer

Detailed Explanation

Related Questions

More from 2023

Explore More Questions