The three most common types of radiation emitted by radioactive nuclei were originally named alpha, beta, and gamma rays, after the first letters of the Greek alphabet. In order of increasing ability to penetrate matter, these are

Question

Quizplus · Accepted Answer

The question states that the order is "in increasing ability to penetrate matter." Alpha particles are the largest, heaviest and slowest of the three types of radiation, and are easily stopped by a piece of paper or skin. Beta particles are smaller and faster, and can penetrate through things like clothing and skin. Gamma rays are the smallest and fastest, and can go through most materials, including concrete and steel. Therefore, the order of increasing ability to penetrate matter is alpha, beta, gamma, making choice A the correct answer.

The Three Most Common Types of Radiation Emitted by Radioactive