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Potassium atoms (from potassium chloride) emit light in a flame corresponding to an energy transition of 4.90 X 10^-19 J. Calculate the wavelength of light

Potassium atoms (from potassium chloride) emit light in a flame corresponding to an energy transition of 4.90 X 10^-19 J. Calculate the wavelength of light emitted and predict the color of the visible flame that Lumi observed.

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