RRB Group D Model Paper 5 with solutions

(1) A beta particle, sometimes called beta ray, denoted by the lower-case Greek letter beta (β), is a high-energy, high-speed electron or positron emitted in the radioactive decay of an atomic nucleus, such as a potassium- 40 nucleus, in the process of beta decay. Two forms of beta decay, β− and β+, respectively produce electrons and positrons.