Multiple choice

The radioactive emanations having a charge of -1 is

  1. alpha particles

  2. gamma rays

  3. beta particles

  4. positron

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

Beta particles have a charge of minus 1, and a mass of about 1/2000th of a proton. This means that beta particles are the same as an electron. They are fast and light. Beta particles have a medium penetrating power.