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Des : 1

সঠিক উত্তরঃ 5.77 d
আমরা জানি,
গড় আয়ু, $τ = \frac{অর্ধায়ু (T)}{0.693}$
সুতরাং, রেডনের গড় আয়ু $τ = (\frac{4}{0.693}) d = 5.77 d$

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