Radiation Safety Practice Exam

Which of the following has no charge?

1. Proton

2. Neutron

3. Electron

4. Gamma Ray

The correct answer is: Gamma Ray

Gamma rays are a form of electromagnetic radiation, similar to visible light but with much higher energy. They do not possess an electric charge, which distinguishes them from other particles such as protons, neutrons, and electrons. Protons carry a positive charge, electrons carry a negative charge, and although neutrons are neutral, they still are considered massive particles within an atomic nucleus, which is not applicable in the same context as gamma rays. Gamma rays are produced by various nuclear reactions and decay processes, and their uncharged nature allows them to penetrate materials more effectively than charged particles, making them significant in both medical applications and radiation safety considerations.