Question: 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

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 aluminum (work function = 4.3 eV) or cesium (work function = 2.1 eV).

(a) Which one is a better choice?

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

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