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Rn decays into Po by emitting an α-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
  • 3.2 × 1010
  • 0.53 × 1010
  • 2.1 × 1010
  • 0.8 × 1010

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