Question

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In a photoelectric effect experiment, an unknown metal is illuminated by light. If the Kinetic Energy of the ejected electrons when illuminated by light of 300nm wavelength is 3.89 times larger than the kinetic energy when the same metal is illuminated by light of 400nm, determine what is the Binding Energy (eV) of the metal?

Answer 1

From Einstein's Photo electric Equation,

Energy of Photon = Binding Energy + Kinetic Energy

From the question,

' h ' and ' c ' are constant ; substituting all values/

Substituting in Eqn (2)

Binding Energy,