Chapter 20.2, Problem 9R

To determine

Contrast, alpha particles, beta particles, and gamma particles is to be explained.

Answer to Problem 9R

Alpha particles are positive charge particles.

Beta particles are negative charge particles.

Gamma particles have no metallic properties.

Explanation of Solution

Alpha particles:

Alpha particles have two unit positive charge and has a mass of four times that of a proton.

Alpha particles get scattered while passing through metal foil.

Alpha particles have low value of penetration power.

Beta particles:

Beta particle are very fast moving electrons, carry unit negative charge.

Beta particles can affect a photographic plate.

Beta particles have good value of penetration power.

Gamma particles:

Gamma particles have no metallic properties.

Gamma particles can affect the photographic plate.

Gamma particles have high value of penetration power.

Conclusion:

Alpha beta and gamma particles are emitted during radioactive decay. these are the invisible rays.