Electromagnetic WavesHard

Question

For a radioactive material, half-life is 10 minutes. If initially there are 600 number of nuclei, the time taken (in minutes) for the disintegration of 450 nuclei is :-

Options

A.

20

B.

10

C.

30

D.

15

Solution

N0 = 600, N' = 450
N = N0 – N'
N =150
NNo=12t/TH      ⇒150600=12t/10⇒14=12t/10          ⇒122=12t/102=t10⇒t=20 min

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