You need to know about these quantities used in waves - what they mean, the symbols used for them and the units used to measure them. The amplitude (\(a\)) of a wave is the distance from the centre ...

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the speed of light and all electromagnetic waves in a vacuum is 300,000,000 m/s or 3×10 8 m/s the speed of sound in air is often taken to be 340 m/s.