Definition

A type of electron tube that has a photosensitive surface, which releases electrons when exposed to light.

Example

The scientist used a phototube to measure the intensity of the light in the experiment.

Conversation

Have you ever heard of a phototube?

Yeah, I think it's used in some types of cameras, right?

Exactly! It helps capture light more effectively.

That's pretty cool! I didn't realize how important it was.

Synonyms & Antonyms

Root Explanation

Phototube → It is formed from "photo-" (from Greek "phōs", meaning light) and "tube" (from Latin "tubus", meaning a cylindrical container). The word "phototube" refers to a cylindrical device that detects or measures light.

Memory Tip

Think of 'light' ('photo-') being captured or measured in a 'cylinder' ('tube') — that's what a phototube does.

Visually Confused Words