Multiple choice

In a radioactive decay radioactive decay a electron is emitten in form of

  1. alpha particle

  2. neutron

  3. beta particle

  4. photon

Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Beta rays are much lighter energy particles. The beta particles are energetic electrons given off by the nucleus of unstable isotopes to restore energy balance. They leave the nucleus at a speed of 270,000 kilometres per second.