. 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 choice? (b) What is the lowest photon frequency that can be detected with your photocell? (c) Where does this frequency fall in the electromagnetic spectrum? 2.1 eV). (a) Which one is a better

Principles of Physics: A Calculus-Based Text
5th Edition
ISBN:9781133104261
Author:Raymond A. Serway, John W. Jewett
Publisher:Raymond A. Serway, John W. Jewett
Chapter24: Electromagnetic Waves
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20. 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? (c) Where does this frequency fall
in the electromagnetic spectrum?
ES
Transcribed Image Text:20. 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? (c) Where does this frequency fall in the electromagnetic spectrum? ES
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