WAEC - Chemistry (2001 - No. 6)
A sheet of paper is placed in the path of a beam from a radioactive source. The emissions that pass through the paper consist of
alpha particles and gamma rays
alpha and beta particles
beta particles and gamma rays
alpha particles only
Giải thích
Among the three types of radiations, alpha, beta and Gamma rays, it is only alpha rays that cannot penetrate a piece of paper or human hand, as it has the lowest penetrating power though the highest ionizing power. However, Beta particles and Gamma rays can pass through or penetrate a piece of paper. Option C is the correct answer.