The threshold frequency of Cu is 1.12x1015 Hz. Consider a bar of copper illuminated by photons with an energy of 5.00 eV

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The threshold frequency of Cu is 1.12x1015 Hz. Consider a bar of
copper illuminated by photons with an energy of 5.00 eV. a)
Determine the velocity of the ejected electrons. b) Determine the λ
of the ejected electrons if they were described according to their
wave nature.
Please show full working out
ANSWERS:
4a) 3.6\times10^53.6×105 ms^{-1}−1
4b) 2.0\times10^{-9}2.0×10−9 m