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Q.

Two radioactive sources A and B of half lives 1 hour and 2 hour respectively initially contain the same number of radioactive atoms. At the end of two hours, their rates of disintegration are ion the ratio of

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a

1:4

b

1:3

c

1:2

d

1:1

answer is C.

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Detailed Solution

Rate of disintegration ∝  No. of atoms left In case of source A,NN0=(12)2=14 In case of source B, NN0=(12)1=12 .∴RARB=N0/4N0/2=12
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