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Wave - Coggle Diagram

- - - - One way in which waves can differ is in their amplitude.
        The amplitude is a measure of how far a wave rises or falls from its starting point. As a result, a high amplitude wave will carry more energy than a low amplitude wave.
    - - Another important property of a wave is its frequency. Frequency is a measure of how many full oscillations occur in one second or how many waves pass a point in one second.
        The units of frequency are hertz (Hz).
    - - The frequency of a wave is also related to the time period of a wave. The time period is how long it takes each wave to pass a point.
    - - The wavelength of a wave is a measure of the distance from the peak of one wave to the peak of the next. The wavelength and frequency are related: if a wave has a short wavelength, the frequency will be higher, and if a wave has a longer wavelength then the frequency will be lower.
- - - - Colour is the way we ‘see’ light of different frequencies. Colour vision is provided by special light-sensitive cells in the retina called cones (because they are shaped like cones).
        Cone cells have frequency-sensitive parts that send a different signal to the brain when light of different frequencies fall on them.
        The cone cells respond to light that is red, green or blue: These are then the primary colours that form the basis of all other colours when mixed together.
        Cone cells are crowded in around the fovea, and they only work well in bright conditions, For conditions of lower brightness, we have cells called rods which are very sensitive to low light levels, but cannot distinguish between different frequencies.