The work function of gold is 4.6 eV. Photons of a certain energy are found to eject

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The work function of gold is 4.6 eV. Photons of a certain energy are found to eject electrons with a kinetic energy of 2.3 eV. 

(a) What is the speed of the ejected electrons? 

(b) What is the photon frequency? 

(c) If the photon energy is increased by a factor of two, what is the kinetic energy of the ejected electrons?

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