JAMB - Physics (1979 - No. 24)
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
i, ii, iii and iv only
iv and v only
i, ii and iii only
i, ii and v only
all