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A clean surface of potassium in a vacuum is irradiated with light of wavelength 5.5 x10 -7 m and electrons are found just to emerge, but when light of wavelength 5.0 x 10 -7 m is incident, electrons emerge with energy 3.62 x 10-20 J. Estimate a value for Planck's constant.

I understand the basics like finding work functions and Einstein's equation, but I haven't got a clue with this one. This is an emergency!

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# Homework Help: Estimate value for Planck's Constant? Please help hopeless A level student

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