waves and information I

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many kinds of waves

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journeys of light I: media

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journeys of light II: surfaces

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the electromagnetic spectrum I

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the electromagnetic spectrum II

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speed, frequency and wavelength I

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some interactions of waves with matter

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travel of waves and vibrations of media

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radio signals

sound: amplitude and frequency

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An introduction to China: history, culture, geography, travel

Video for adult learners of English at beginner and elementary levels

A fun gied too speling ov dhu Inglish langwej

Our UK company 

Video and information for children

Copyright (c) David Brodie, 2019-2021

Photography: Adobe Stock