Q.

Two radio active nuclei x and y initially contain an equal no.of atoms.  Their half life are 1 hr, 2 hrs.  The ratio of their rates of disintegration after  2 hrs from the start is

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a

4 : 1

b

1 : 1

c

1 : 2

d

2 : 1

answer is B.

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Detailed Solution

activity is N λ =dNdt  after 2 hours x becomes N4 and Y becomes N2  as λ is inversely proportional to T12 there activity are in the ratio, (N4)11 and N212
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