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Which of the following represents the greatest energy transition from a higher energy level to a lower one?


emission of a blue photon of 450 nm

emission of a red photon of 770 nm

emission of a green photon of 550 nm

emission of a yellow photon of 590 nm

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Mindaka
You need to use Planck's law:
E = h·υ = (h·c)/λ

Without making all the calculations, a fraction is bigger than another when the denominator is smaller. Therefore you need to find the smallest wavelength (λ) which is 450nm.

You could also be helped by colors: in order of decreasing energy, you have blue - green - yellow - red.

In any case, the correct answer is a).

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