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?
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?
- [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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