When electromagnetic radiation of wavelength `300 nm` falls on the surface of sodium, electrons are emitted with a kinet

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Q 2602134038.     When electromagnetic radiation of wavelength `300 nm` falls on the surface of sodium, electrons are emitted with a kinetic energy of `1.68 ×10^5 J mol^(–1)`. What is the minimum energy needed to remove an electron from sodium? What is the maximum wavelength that will cause a photoelectron to be emitted ?

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