| Front | What is frequency |
| Back | Frequency is the number of waves that pass a certain point, produced by a source, per second. |
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| Front | Colours of the visible spectrum in order of decreasing wavelength |
| Back | Red, Orange, Yellow, Green, Blue, Indigo, Violet |
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| Front | What is amplitude |
| Back | Amplitude is the difference between the equilibrium of a wave (its resting position) and the wave crest. |
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