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NEET2019PhysicsNuclear PhysicsActual

The half-life of ²¹⁵ At is 100 s . The time taken for the radioactivity of a sample of ²¹⁵ At to decay to 1 / 16^ th of its initial value is

Options

  1. A400 s
  2. B6.3 s
  3. C40 s
  4. D300 s

Correct answer

A. 400 s

Step-by-step solution

After n half lives N=N₀ ( 1 2 )^n ²¹⁵ At decays to 1 16 ^ th in 4 half-lives i.e., after 400 s .

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