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NEET2009PhysicsNuclear PhysicsActual

If the half lives of a radioactive element for and decay are 4 years and 12 years respectively, the ratio of its inital activity and that after 12 years will be

Options

  1. A6.25 %
  2. B12.5 %
  3. C25 %
  4. D50 %

Correct answer

A. 6.25 %

Step-by-step solution

aligned & T= T_ T_ T_ +T_ = 4 12 4+12 =3 & n= t T = 12 3 =4 & N N₀ = ( 1 2 )^n= ( 1 2 )^4= 1 16 =6.25 % aligned

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