1.

The half lifr of a particle of mass `1.6 xx 10^(-26) kg` is `6.9 s` and a stream of such particles is travelling with the kinetic energy of a 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 isA. `0.1`B. `0.01`C. `0.001`D. `0.0001`

Answer» Correct Answer - D
`(dN)/(dt)=n lamda rArr(dN)/(dt)=lamda dt`
`(6.63)/(6.9)xx10^(-4) =10^(4)`


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