Out of 10 mg of a radioactive sample, 1.25 mg remains un-decayed after 6 hours. The mean life of the sample in hours is
We have, N = N0/2n so that 1.25 = 10/2n, from which 2n = 8 and n = 3. So, 3 half-life periods is 6 hours so that the half-life of the sample is 2 hours. Mean life, T = 1/λ = Thalf /0.693 = 2/0.693.
346 MCQ for effective preparation of the test of Basics of Physics section.
Read the MCQ statement: Out of 10 mg of a radioactive sample, 1.25 mg remains un-decayed after 6 hours. The mean life of the sample in hours is , keenly and apply the method you have learn through the video lessons for Basics to give the answer. Record your answer and check its correct answer and video explanation for MCQ No. 34-10501.