A mixture consists of two radioactive materials A1 andA2 with half lives of 20 s and 10 s respectively. Initially the mixture has 40 g of A1 and 160 g of A2. The amount of the two in the mixture will become equal after:
For A1, N01=40g, t1/2= 20 sec
For A2, N02=160g, t1/2 = 10 sec
Let us say at t =t, amount of A and A2 become equal then at t = t
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