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NEET2010PhysicsNuclear PhysicsActual

The decay constant of a radio isotope is . If A₁ and A ₂ are its activities at times t ₁ and t ₂ respectively, the number of nuclei which have decayed during the time ( t ₁- t ₂ )

Options

  1. AA ₁ t ₁- A ₂ t ₂
  2. BA₁-A₂
  3. C(A₁-A₂ )
  4. D(A₁-A₂ )

Correct answer

C. (A₁-A₂ )

Step-by-step solution

aligned A ₁ & = N ₁ ~A ₂ & = N ₂ ~N ₁- N ₂ & = [ A ₁- A ₂ ] aligned

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