3.11 identify the order of the electromagnetic spectrum in terms of decreasing wavelength and increasing frequency, including the colours of the visible spectrum

The waves in the electromagnetic spectrum have a range of different frequency and wavelength. This is used to place the waves of the electromagnetic spectrum in order. The waves at the top (starting from radio waves) have a longer wavelength, lower frequency and a lower amount of energy. As you go down the electromagnetic spectrum, the wavelength decreases, frequency increases and the amount of energy increases.  

The colours of the visible spectrum include Red, Orange, Yellow, Blue, Indigo and Violet. The colour at the top (starting from red) has the longest wavelength, the lowest frequency and the lowest amount of energy. As you go down the visible spectrum, the wavelength decreases, frequency increases and the amount of energy increases.