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How do we know light is a kind of wave?

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A wave is a disturbance that travels from one point to another in a medium. This disturbance can also be referred to as variation in energy. Light consists of energy derived from oscillating magnetic and electric fields. As light moves, it carries this energy from the source to another location. Also, waves have frequency and wavelength. Given these characteristics of light, we can conclude that

light is a kind of wave

User Tobias Knauss
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