Question

Two radioactive substances A and B have decay constants 5(lambda) and lambda . At t=0 they have same no. of nuclei.The ratio of no.of nuclei of A to those of B will be (1/e)^2 after a time interval

1- 4/lambda

2-2/lambda

3-1/2(lambda)

4-1/4(lambda)

Answer 1

the answer of the question is (1/4)lambda