1.) Alpha rays can penetrate.A.) air onlyB.) a piece of paperC.) several millimeters of aluminumD.) several centimeters of lead2.) Gamma rays can penetrate.A.) air onlyB.) a piece of paperC.) several millimeters of aluminumD.) several centimeters of lead
1 A Because of their large mass, alpha particles have a short range of only a few centimetres in airThey have a low penetrating power and can be stopped by a sheet of paper or aluminium2 D Gamma rays can pass through a thin sheet of lead with very little effectYou need about 10 cm of lead to stop most gamma rays completely.
