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NEET2003PhysicsNuclear PhysicsActual

A sample of radioactive element has a mass of 10 ~g at an instant t=0 . The approximate mass of this element in the sample after two mean lives is:

Options

  1. A1.35 ~g
  2. B2.50 ~g
  3. C3.70 ~g
  4. D6.30 ~g

Correct answer

A. 1.35 ~g

Step-by-step solution

( aligned & N = N ₀ e ^ - t m = m ₀ e ^ - t = m ₀ e ^ - (2 / ) & = 10 e ^2 =1.35 gm aligned )

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