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रेडियम की अर्द्ध-आयु 1622 वर्ष है। कितने समय बाद रेडियम के 7/8 भाग का क्षय हो जाएगा ?

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रेडियम की अर्द्ध आयु 1622 वर्ष है।

प्रश्नानुसार, रेडियम के \(\frac 78\) भाग का क्षय हो जाएगा = \(\frac{1622 \times 7}{8} = 1419.25\) वर्ष।

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