Nuclear Physics and RadioactivityMedium

Question

Initially only radioactive element A is present which is disintegrated into another stable element B. After 6hrs ratio of number of atoms of A and B is found to be 1:7.Half life is A is

Options

A.3hrs
B.2hrs
C.1.5hrs
D.2.5hrs

Solution

          .......(i)
          .......(ii)
Where N0 is number of atoms of A at t = 0
solving (1) and (2) we get, 

⇒NA N0 ⇒ half life = 2 hrs.

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