Question

Which of the following statements is not true about alpha particles?

a.essentially the same as a helium nucleus
b. from an external source of exposure, it is less harmful than beta particle
c. it is smaller than beta particle
d. its velocity is less than that of a gamma ray

Answer 1

The answer is c. it is smaller than beta particle. An alpha particle has the greatest mass among the three types of ionizing radiation thus, it has the greatest ability to damage tissue if it has been introduced into the human body.