Question: Zinc has a work function of 4 . 3 eV . What is the longest wavelength of light that will release an electron from a

Zinc has a work function of 4.3 eV.
What is the longest wavelength of light that will release an electron from a zinc surface?
A 4.7 eV photon strikes the surface and an electron is emitted. What is the maximum possible speed of the electron?

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