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AP EAMCET201823 Apr 2018Evening ShiftPhysicsNuclear PhysicsActual

The number of half lives elapsed before 93.75 % of a radioactive sample has decayed is

Options

  1. A6
  2. B4
  3. C2
  4. D8

Correct answer

B. 4

Step-by-step solution

Number of half lives be obtained by using array llll N =N₀ ( 1 2 )^n Here, N =(100-93.75) N₀ 100 = 6.25 100 N₀ ( 1 2 )^n = 625 10000 = ( 5 10 )^4= ( 1 2 )^4 or n =4 array

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