1.0 gm radioactive sodium on decay becomes 0.25 gm in 16 hours. How much time 48 gm of same radioactive sodium will need to become 3.0 gm

Options :
  1. 48 hours
  2. 20 hours
  3. 32 hours
  4. 16 hours
Answer and Explanation :-

Answer: Option 3

Explanation:

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