Concept:White light, X-rays, and infrared are all part of the electromagnetic spectrum, while a photon is a quantum of electromagnetic energy, not a wave itself.
Explanation:White light is visible light, which is a form of electromagnetic wave.
X-rays are electromagnetic waves with very short wavelengths.
Infrared rays are also electromagnetic waves with longer wavelengths than visible light.
A photon is a massless packet of energy that carries electromagnetic radiation, but it is not the electromagnetic wave itself.
Therefore, the only option that is not an electromagnetic wave is the photon.
Answer:B. Photon