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JAMB Physics 1979 Question 31

Question 31

Radioactivity and Nuclear Physics

Which of the following statements about radioactivity are true? (i) Alpha particle is positively charged (ii) Beta particle is negatively charged (iii) Gamma ray is neutral (iv) Beta particle has the same mass as helium atom (v) Gamma ray is charged.

  1. A.i, ii, iii, iv only
  2. B.iv and v only
  3. C.i, ii and iii only
  4. D.i, ii and v only
  5. E.All
Show the answer and explanation

Answer: C (i, ii and iii only)

Explanation

Alpha particles are positive, beta particles (electrons) are negative and gamma rays have no charge. A beta particle is far lighter than a helium atom, and gamma rays are not charged.