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एक रेडियो-ऐक्टिव पदार्थ का अर्द्ध-आयुकाल 70 दिन है। उसी समान पदार्थ के 1 ग्राम पदार्थ का वजन कितने दिनों बाद 0.25 ग्राम होगा?

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एक रेडियो-ऐक्टिव पदार्थ का अर्द्ध-आयुकाल 70 दिन है। उसी समान पदार्थ के 1 ग्राम पदार्थ का वजन कितने दिनों बाद 0.25 ग्राम होगा?






 
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