The half life of a particle of mass 1.6x...

The half life of a particle of mass `1.6xx10^(-26) kg is 6.9` s and a stream of such particles is travelling with the kinetic energy of a particle being 0.05 eV. The fraction of particles which will decay when they travel a distance of 1 m is -

0.1

0.01

0.001

0.0001

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