The half-life of Radioactive substance is 20 min . The approximate time interval ( t 2 - t 1 ) between the time t 2 when 2 3 of it has decayed and time t 1 when 1 3 of it had decayed is

Question

The half-life of Radioactive substance is 20 min . The approximate time interval ( t 2 - t 1 ) between the time t 2 when 2 3 of it has decayed and time t 1 when 1 3 of it had decayed is, 14 min, 20 min, 28 min, 7 min

MARKS App · Accepted Answer

N 1 = N 0 - 1 3 N 0 = 2 3 N 0 N 2 = N 0 - 2 3 N 0 = 1 3 N 0 ∴ N 2 N 1 = 1 2 n n = 1 ∴ t 2 - t 1 = o n e h a l f – l i f e = 20 m i n

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