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NTA Abhyas NEET2020ChemistryChemical KineticsPractice

If for a radio-isotope, at the end of 4.2 d a y s , N = 0.798 N 0 . What will be half-life period of its nucleus?

Options

  1. A10 d a y s
  2. B12.83 d a y s
  3. C15 d a y s
  4. D20 d a y s

Correct answer

B. 12.83 d a y s

Step-by-step solution

t   =   2 .303   ×   t 1/2 0 .693   log   N o N t 1/2   =   4 .2   ×   0 .693 2 .303   ×   log N 0 0 .796   N 0 ∴ t 1/2 = 12.83

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