9.3 In the photoelectric effect an electron is emitted from a metal as the result of absorption of a photon of light. Part of the energy of the photon is required to release the electron from the metal; this energy o is called the work function or binding energy.The kinetic energy of the ejected electron is given by \frac{1}{2} m v^{2}=h \nu-\phi where m and v are the mass and velocity of the electron. For the100 face of silver metal (see Chapter 23) the velocity of electrons emitted using 200-nm photons is 7.42 x 10ms-1. Calculate the work function of this face in eV.

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