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 be electron, another (nearly) massless and electrically neural particle is also emitted (Case II). Based on the figure below, which of the following is correct :

Question

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 be electron, another (nearly) massless and electrically neural particle is also emitted (Case II). Based on the figure below, which of  the following is correct :

Examsnet · Accepted Answer

Correct Answer is :  (a) in case II and (b) in case I

KVPY 2019 SB SX Exam Previous Papers