GENERAL KNOWLEDGE

Detailed explanation-1: -Alpha particles have the least penetration power and can be stopped by a thick sheet of paper or even a layer of clothes. They are also stopped by the outer layer of dead skin on people. This may seem to remove the threat from alpha particles but only from external sources.

Detailed explanation-2: -The fundamental particle that has least mass is electron.

Detailed explanation-3: -Alpha particles have approximately four times the mass of a proton or neutron and approximately 8, 000 times the mass of a beta particle. Because of the large mass of the alpha particle, it has the highest ionizing power and the greatest ability to damage tissue.

Detailed explanation-4: -Alpha and beta decay are the most common modes of natural radioactivity in which alpha particles have the lowest energy as it is the heavier of the particles.

Detailed explanation-5: -Alpha particles are the least dangerous in terms of external exposure. Each particle contains a pair of neutrons and a pair of protons. They don’t penetrate very deeply into the skin, if at all–in fact, clothing can stop alpha particles.