Which among the following is a positively charged particle emitted by a radioactive element?

Correct answer: (c) Alpha ray

Explanation

Alpha rays are positively charged particles, each made of 2 protons and 2 neutrons (a helium nucleus), emitted in radioactive decay.

Beta rays are negatively charged electrons, and cathode rays are also electrons – both negative, not emitted as positive radiation.

Alpha particles are highly ionizing but short-range, first studied by Rutherford.