Question: A nickel crystals work function is measured to be 5.22 eV at 25C. As the temperature increases by 300C, the work function drops by 50

A nickel crystal’s work function is measured to be 5.22 eV at 25°C. As the temperature increases by 300°C, the work function drops by 50 meV. By how much does this shift the threshold wavelength for photoelectric emission?

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