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What common English word has...

What common English word has the 3 letter consecutive sequence XOP?

Correct answers: 40

The first user who solved this task is Roxana zavari.

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Photophone

In 1882, the photophone was demonstrated by Alexander Graham Bell and Charles Sumner Tainter. In their device, a mirrored silver disc was made to vibrate by speech from a speaking tube. Light reflected off the disc was focused by a parabolic dish onto a selenium photocell. The variations in the reflected light were converted into electrical signals carried to headphones.

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