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Manipal MET2011PhysicsNuclear Physics

Rn decays into Po by emitting an -particle with half-life of 4 days. A sample contains 6.4 10¹⁰ atoms of Rn after 12 days, the number of atoms of Rn left in the sample will be

Options

  1. A3.2 10¹⁰
  2. B0.53 10¹⁰
  3. C2.1 10¹⁰
  4. D0.8 10¹⁰

Correct answer

D. 0.8 10¹⁰

Step-by-step solution

Remaing amount N=N₀ ( 1 2 )^n aligned N & =6.4 10¹⁰ ( 1 2 )^ 12 / 4 & =0.8 10¹⁰ atoms aligned

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