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NEET2004PhysicsNuclear PhysicsActual

The half life of a radium is about 1600 years. Of 100 ~g of radium existing now 25 g will remain unchanged after :-

Options

  1. A4800 years
  2. B6400 years
  3. C2400 years
  4. D3200 years

Correct answer

D. 3200 years

Step-by-step solution

Applying the formula aligned N & =N₀ ( 1 2 )^n N N₀ & = ( 1 2 )^n aligned 25 100 = ( 1 2 )^n n=2 Total time is 2 1600=3200 year

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