The half life of a radioactive substance

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Target Exam

CUET

Subject

Physics

Chapter

Nuclei

Question:

The half life of a radioactive substance is 20 s. The time taken for its sample to decay 7/8th of the initial value

Options:

20 s

40 s

60 s

80 s

Correct Answer:

60 s

Explanation:

The correct answer is Option (3) → 60 s