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Starting with a sample of pure ⁶⁶ Cu , 7 / 8 of it decays into Zn in 15 minutes. The corresponding half-life is

Options

  1. A10 minutes
  2. B15 minutes
  3. C5 minutes
  4. D7 1 2 minutes

Correct answer

C. 5 minutes

Step-by-step solution

N ₀ t _ 1 / 2 N ₀ 2 t _ 1 / 2 N ₀ 4 t _ 1 / 2 N ₀ 8 3 t _ 1 / 2 =15 t _ 1 / 2 =5

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