Get premium membership and access revision papers with marking schemes, video lessons and live classes.
  OR
Processing. Please wait.

 Form 4 Physics: Radioactivity online lessons

Introduction and meaning of radioactivity

 (2m 15s)
363 Views     SHARE

Download as pdf file

Answer Text:
RADIOACTIVITY
Introduction
Radioactivity was discovered by Henri Becquerel in 1869. In 1898, Marie and Pierre Curie succeeded in chemically isolating two radioactive elements, Polonium (z=84) and Radium (z= 88). Radioactivity or radioactive decay is the spontaneous disintegration of unstable nuclides to form stable ones with the emission of
radiation. Unstable nuclides continue to disintegrate until a stable atom is formed.alpha and beta particles are emitted and the gamma rays ( accompany the ejection of both alpha and beta particles.


|