Final answer:
Electromagnetic radiation can behave both as a wave and a stream of particles known as photons, described by the concept of wave-particle duality.
Step-by-step explanation:
According to Einstein, electromagnetic radiation can behave like a wave and also like a stream of particles. This duality refers to the fact that under some physical circumstances electromagnetic radiation acts as a wave, capable of interference and diffraction, while under other circumstances, it acts as a beam of massless particles known as photons. Therefore, the correct answer to which of the following can behave like a wave and also like a stream of particles is c. electromagnetic radiation.
The concept that describes this duality is known as wave-particle duality. Experiments confirm that electromagnetic radiation can sometimes display wavelike properties and at other times particle-like properties. Examples like the photoelectric effect, where electrons are ejected from a metal when hit by photons, support the particle description of light, whereas interference patterns demonstrate its wave characteristics.
Answer: c. electromagnetic radiation