Question

Which one has the least penetrating power ?

• A. alpha radiation
• B. beta radiation
• C. gamma radiation
• D. cant say

Answer 1

The correct option is A alpha radiation

Alpha particle has the least penetrating power.

The ability of radioactivity to pass through materials is called its penetrating ability. Penetrating ability depends on the size of the radioactive particle. Alpha particles are the biggest, beta particles are very much smaller and gamma rays have no mass. The bigger the particle, the more likely it is to have a collision with the atoms of the material. The collision will stop the particle going through the material.