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zinc has a work function of 4.3eV. A) what is the longest wavelength of light that...

zinc has a work function of 4.3eV. A) what is the longest wavelength of light that will release an electron form a zinc surface? B) a 4.7 eV photon strikes the surface and an electron is emitted. What is the maximum possible speed of the electron? explain with diagrams/figures please

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