1.

Samples of two radioactive nuclides A and B are taken. lambda_(A) and lambda_(B) are the disintegration constants of A and B respectively. In which of the following cases, the two samples can simultaenously have the same decay rate at any time?

Answer»

Initial rate of DECAY of A is twicethe initial rate of decay of B and `lambda_(A)=lambda_(B)`
Initial rate of decay of A is TWICE the initial rate of decay of B and `lambda_(A)gtlambda_(B)`
Initial rate of decay of B is twice the initial rate of decay of A and `lambda_(A)gtlambda_(B)`
Initial rate of decay of B is same as the rate of decay of A at t=2h and `lambda_(B)=lambda_(A)`

SOLUTION :The two SAMPLES of two radioactive nuclides A and B can simultaneously have the same decay rate at any time if initial rate of of decay A is twice the initialrate of decay of B and `lambda_(A)gtlambda_(B)`. Also, when initial rate of decay of B is same as rate of decay of A at t=2h and `lambda_(B) ltlambda_(B)`. The CHOICE (b) and (d) is correct.


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