Which of the following is an electromagnetic wave? A. Sound waves B. Alpha rays C. Beta rays D. Gamma rays

Step-by-step solution

Electromagnetic waves are waves that do not require a material medium for propagation and consist of oscillating electric and magnetic fields. Sound waves are mechanical waves requiring a medium. Alpha rays consist of helium nuclei, and beta rays consist of high-speed electrons, both of which are particle radiations with mass and charge. Gamma rays are high-energy photons, which are a form of electromagnetic radiation. Answer: D