Particles emitted in radioactive decay have different penetrating power. The penetration depths of two particles, labeled X and Y, in a column of water are shown below. Which of the following statements could not be true?

Question

Quizplus · Accepted Answer

Gamma rays are more penetrating than beta particles, which are more penetrating than alpha particles. Therefore, it is not possible for a beta particle (Y) to have a lower penetration depth than an alpha particle (X). Thus, option D, where X is a gamma ray and Y is a beta particle, cannot be true. The other options are all possible.

Particles Emitted in Radioactive Decay Have Different Penetrating Power α\alphaα Particle and Y Is A

Particles Emitted in Radioactive Decay Have Different Penetrating Power $\alpha$ Particle and Y Is A