Question

multiple - choice question
what can stop a beta particle?
several inches of lead
a piece of paper or cloth
a sheet of aluminum foil or your skin

Explanation:

Beta particles are electrons or positrons. They have more penetrating power than alpha particles (which can be stopped by a piece of paper or cloth) but less than gamma rays (which need several inches of lead to be stopped). A sheet of aluminum foil or skin can stop beta particles as they are moderately penetrating.

Answer:

a sheet of aluminum foil or your skin