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NEET2018PhysicsNuclear PhysicsActual

If decay constant of a radioactive sample is 0.05 per year, then find the time (in year) for which sample will decay by 75 % .

Options

  1. A28
  2. B56
  3. C14
  4. D7

Correct answer

A. 28

Step-by-step solution

Here, =0.05 per year aligned & N=N₀- 3 N₀ 4 =N₀ / 4, t=? & _e N N₀ = t & t= _e N₀ N = _e 4 0.05 =27.72 year 28 year aligned

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