When light with wavelength 740 nm shines on a particular sheet of metal, it ejects electrons...

Question:

When light with wavelength 740 nm shines on a particular sheet of metal, it ejects electrons that have a maximum kinetic energy of 0.4 eV . What is the maximum kinetic energy of ejected electrons if we shine light with wavelength 380 nm ﻿ on the sheet of metal instead?

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