For potassium, the red border of the photoelectric effect corresponds to yellow, and for cesium, to orange. For which of these

For potassium, the red border of the photoelectric effect corresponds to yellow, and for cesium, to orange. For which of these metals is the frequency corresponding to the red border of the photoelectric effect higher?

The frequency of the yellow color is higher than the frequency of the orange color, so for potassium the frequency of the red border is higher.

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