$\mathbf{E}\mathbf{}\mathbf{=}\mathbf{}\mathbf{hv}\phantom{\rule{0ex}{0ex}}\mathbf{E}\mathbf{}\mathbf{=}\mathbf{}\frac{\mathbf{hc}}{\mathbf{\lambda}}\phantom{\rule{0ex}{0ex}}\mathbf{\lambda}\mathbf{}\mathbf{=}\mathbf{}\frac{\mathbf{hc}}{\mathbf{E}}\phantom{\rule{0ex}{0ex}}$

Titanium (6.94x10^{-19} J) and silicon (7.77x10^{-19} J) surfaces are irradiated with UV radiation with a wavelength of 215 nm. What is the wavelength of the electrons emitted by the titanium surface?

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