Exam-style question
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Describe how a photodiode operates when exposed to light.
Model answer
What a good answer should say
- A photodiode operates by generating a photocurrent when light photons are absorbed by the semiconductor material.
- This occurs due to the excitation of electrons, which creates electron-hole pairs, allowing current to flow when the diode is reverse-biased.
Explanation
Why this works
This answer is strong because it accurately describes the fundamental operation of a photodiode, focusing on the interaction between light and the semiconductor. The question tests the student's understanding of the basic principles of photodiode functionality.
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