What converts light into a charge?

Study for the Mosby Digital Image Acquisition Test. Prepare with flashcards and multiple choice questions, each offering hints and explanations. Excel in your exam!

Multiple Choice

What converts light into a charge?

Explanation:
When light shines on a semiconductor device designed to detect it, photons create electron-hole pairs inside the material. In a photodiode, a p-n junction is used and the built-in electric field (often enhanced by reverse bias) quickly separates these charge carriers, generating a current or a measurable charge proportional to the light intensity. This makes the photodiode specifically suited to convert light energy into an electrical signal. A regular diode isn’t designed to respond to light in this way, so it won’t reliably translate light into a charge signal. The other options describe components or processes unrelated to sensing light, so they don’t fit the function described.

When light shines on a semiconductor device designed to detect it, photons create electron-hole pairs inside the material. In a photodiode, a p-n junction is used and the built-in electric field (often enhanced by reverse bias) quickly separates these charge carriers, generating a current or a measurable charge proportional to the light intensity. This makes the photodiode specifically suited to convert light energy into an electrical signal.

A regular diode isn’t designed to respond to light in this way, so it won’t reliably translate light into a charge signal. The other options describe components or processes unrelated to sensing light, so they don’t fit the function described.

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