DANB Radiation Health and Safety (RHS) Practice Exam

What is a form of energy that includes all options listed?

1. Sound

2. Light

3. X-radiation

4. All of the above

The correct answer is: All of the above

The correct answer is rooted in the understanding that all the options listed—sound, light, and X-radiation—are forms of energy that operate under different principles and physical characteristics. Sound is a mechanical wave that requires a medium (such as air, water, or solids) to propagate. It results from vibrations that travel through these media, making it a form of energy associated with auditory sensations. Light, often referred to in scientific terms as electromagnetic radiation, is a form of energy that travels in waves and does not require a medium to move. It consists of a spectrum of wavelengths, and visible light is only a small part of that spectrum. Light can be absorbed or reflected by materials, carrying energy that can do work, such as providing illumination or triggering photosynthesis in plants. X-radiation, or X-rays, is another form of electromagnetic radiation with a shorter wavelength than visible light. It has high energy and is used in medical imaging to penetrate tissues and create images of the inside of the body. Like light, it does not require a medium for propagation. Since all three types—sound, light, and X-radiation—are recognized as forms of energy, the answer consolidates the commonality they share in contributing to