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Before you start - Waves. Light and sound

Perhaps you have seen one of the latest 3D films at the cinema with spectacular light and sound effects. But have you ever wondered what light is? Which mechanisms do we use to see objects and colours? And do you know what sound is? Why are there high-pitched and low-pitched sounds? Why do we sometimes hear the echo of our voice? What is noise? People in the past asked the same questions, but we now know that light and sound are waves.

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