At any instant, the ratio of the amount of two radioactive substances is 2 : 1. If their half lives be respectively 12 h and 16 h, then after one days what will be the ratio of the substances?

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2:1

2 : 1

1 : 2

1 : 4

answer is A.

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Detailed Solution

N1N01=12t/T1 and N2N02=12t/T2∴ N1N2.N02N01=2t1T2−1T1⇒N1N2.12=224116−112=2−12⇒N1N2=2

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