The order of energy levels of the seven colors in descending order is required.
The required order is Violet, indigo, blue, green, yellow, orange and red.
The energy of a wave is given by
[tex]E=hf[/tex]
where,
h = Planck's constant = [tex]6.626\times 10^{-34}\ \text{Js}[/tex]
f = Frequency of the wave
If the frequency is larger then the energy it has will be higher.
So, the decreasing order of the frequencies of the colors will give us the required order.
The frequency order is: Violet, indigo, blue, green, yellow, orange and red.
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