The mean lives of a radio-active substance are 1620 and 405 years for – McqOptions

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1.	The mean lives of a radio-active substance are 1620 and 405 years for alpha and beta emmision respectively. Find the time during which 3/4 of sample will decay if it is decaying both the alpha and beta emmision simultanously?
A.	449 years
B.	550 years
C.	446 years
D.	556 years
Answer» D. 556 years

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