एक रेडियोएक्टिव पदार्थ की – McqOptions

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1.	एक रेडियोएक्टिव पदार्थ की अर्द्ध आयु चार महीने है \| इस पदार्थ के तीन चौथाई का क्षय होने में समय लगेगा
A.	3 महीने
B.	4महीने
C.	8महीने
D.	12महीने
Answer» D. 12महीने

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