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A device called a photocell detects light by letting it fall onto a metal and then...

A device called a photocell detects light by letting it fall onto a metal and then measuring the current from the ejected electrons. You are designing a photocell to work with visible light and are considering the use of either molybdenum (work function = 4.2 eV) or sodium(work function = 2.4 eV).

What is the lowest photon frequency that can be detected with your photocell?

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The work function of a metal is given as: 1eV-1.6x10-19j The work function of molybdenum is given as molybdsnum 4.2eV 4.2(1.6x10-19j 6.62x10-34J.s 10.15x1014 Hz The work function of sodium is given as: W. sodium sodium W. odium odium 2.4eV 2.4(1.6x10-19 j 6.62x10-34J.s -5.8 x1014 Hz Work function is proportional to the frequency of the photon emission. It is expressed as Lower the work function, lower is the frequency

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