Which surface emits electrons with the longer wavelength, Chemistry

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Which surface emits electrons with the longer wavelength

Titanium has a work function of 6.94x10^-19 J and Silicon has a work function of 7.24x10^-19 J. The surfaces are irradiated with UV radiation with a wavelength of 250 nm. Which surface emits electrons with the longer wavelength? What is the wavelength of the electrons emitted by the titanium surface?

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