Originally the radioactive beta decay was thought as a decay of a nucleus with the emission of electrons only (Case $I$) . However, in addition to the electron, another (nearly) massless and electrically neutral particle is also emitted (Case $II$). Based on the figure below, which of the following is correct?

210317-q

  • [KVPY 2019]
  • A

    $(a)$ in both cases $I$ and $II$

  • B

    $(a)$ in case $I$ and $(b)$ in case $II$

  • C

    $(a)$ in case $II$ and $(b)$ in case $I$

  • D

    $(b)$ in both cases $I$ and $II$

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