JEE Advanced 2016 Paper 1 Physics Q15

Physics · Nuclei & Radioactivity

Problem

The isotope

{}^{12}_{5}\mathrm{B}

having a mass 12.014 u undergoes

\beta

-decay to

{}^{12}_{6}\mathrm{C}

{}^{12}_{6}\mathrm{C}

has an excited state of the nucleus (

{ }^{12}_{6}\mathrm{C}^{*}

) at 4.041 MeV above its ground state. If

{}^{12}_{5}\mathrm{B}

decays to

{}^{12}_{6}\mathrm{C}^{*}

, the maximum kinetic energy of the

\beta

-particle in units of MeV is (

1\,\mathrm{u}=931.5\,\mathrm{MeV}/c^2

, where

c

is the speed of light in vacuum).