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End-of-unit evaluation - Light and sound

We perceive most of the things around us because we can see or hear them. Most objects do not have their own light. We see them because they are illuminated by light from natural and artificial sources, and because we have a sense of sight. Light shines on the object, reflects off it, and the image reaches our eyes. Sound comes from the vibrations made by the objects and people around us. We can hear them because of our sense of hearing. [...]

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    Interactivo

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  • Teoría

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