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Photoelectric effect and work function of metal

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The work function W of a metal specifies the minimum energy required to remove an electron from that metal, and is expressed as an energy per mole of electrons. For Calcium Ca, W=262 kJ mol^-1.

(a) A sample of Ca is irradiated with green light. Are electrons ejected? Justify.
(b) A sample of Ca is irradiated with light of wavelength 4.10 x 10^-7 m, and electrons are ejected. What is the speed, in m/s, of these electrons?

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a) first find the energy ...

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The solution is comprised of detailed explanations of photoelectric effect of calcium. It shows the step-by-step calculation of the speed of the ejected electrons when the incident photon energy is larger than its work function.