Ligh of wavelength 248nm is directed onto the surface of a, Physics

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Ligh of wavelength 248nm is directed onto the surface of a

Ligh of wavelength 248nm is directed onto the surface of a metal. The most energetic electrons ejected from the surface are stopped by a 3.5 V stopping potential. What is the work function of this metal and what is the longest wavelength of light which will eject electrons from this metal?

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