A sample of radioactive element has a mass of 10 gm at an instant t = – McqOptions

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1.	A sample of radioactive element has a mass of 10 gm at an instant t = 0.The approximate mass of this element in the sample after two mean lives is [CBSE PMT 2003]
A.	2.50 gm
B.	3.70 gm
C.	6.30 gm
D.	1.35 gm
Answer» E.

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