What type of radiation behaves both like a wave and like a stream of particles?

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Electromagnetic radiation is the correct response because it encompasses a broad range of waves, including visible light, ultraviolet radiation, X-rays, and gamma rays, each of which can exhibit both wave-like and particle-like characteristics. This phenomenon is described by the wave-particle duality, which posits that particles such as photons can display properties of waves, like interference and diffraction, while also behaving as discrete packets of energy or particles.

This dual nature is fundamental to the understanding of quantum mechanics and applies to all forms of electromagnetic radiation. For instance, in experiments like the double-slit experiment, light behaves as a wave, creating interference patterns, but can also be detected as individual photons when measured. This foundational concept in physics is what makes electromagnetic radiation unique and is essential for understanding various technologies, including lasers, imaging systems, and telecommunications.