The Half life of a particle of mass 1.6 10⁻²⁶ ~kg is 6.9 ~s and a stream of such particles is travelling with the K.E. of a particle being 0.05 eV . The fraction of particles which will decay when they travel a distance of 1 ~m is :

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Correct answer: D. 0.0001

dN dt = n d N dt = dt 6.93 6.9 10⁻⁴=10⁻⁴

The Half life of a particle of mass 1.6 10⁻²⁶ ~kg is 6.9 ~s and a stream of such particles is travelling with the K.E. of a particle being 0.05 eV . The fraction of particles which will decay when they travel a distance of 1 ~m is :

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