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Q 5

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Physics for Scientists and Engineers: A Strategic Approach with Modern Physics
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Short Answer

You need to design a photodetector that can respond to the entire range of visible light. What is the maximum possible work function of the cathode?

The maximum possible Work function of the cathode will be 1.7724 eV

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Step by Step Solution

Step 1. It is given that we need to design a photodetector that can respond to the entire range of visible light. 

We need to find out the maximum possible work function of the cathode.

Step 2. Using expression of work function.

Visible region of light is from 400 nm to 700 nm.

So finding for 400 nm and 700 nm :

Therefore the maximum possible Work function will be 1.7724 eV.

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