Multiple choice general knowledge science & technology

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

  1. Beta ray

  2. Alpha ray

  3. Cathode ray

  4. Gamma ray
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Alpha particles (alpha rays) are helium nuclei consisting of 2 protons and 2 neutrons, giving them a +2 charge. Beta particles are high-speed electrons with -1 charge. Gamma rays are neutral electromagnetic radiation, and cathode rays are electron beams in vacuum tubes.

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