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Coherence is one of the unique properties of laser light. It arises from the stimulated emission process which provides the amplification.
A Marvin and Milo activity about vibration and amplification. All you need is a plastic cup or yoghurt pot, a damp cloth and some smooth string.
A Marvin and Milo activity about sound and amplification. All you need is an ice lolly stick, blu tack, string, a thick rubber band, sticky tape, thin card and scissors.