Hertz Demonstrated This in 1886

This page is the CodyCross answer for the clue below from Inventions, Group 45, Puzzle 5.

Question is: Hertz Demonstrated This in 1886

and the answer is: RADIOWAVE

Word Meaning:

RADIO WAVE — (physics) Electromagnetic radiation having a wavelength between about .5 centimeters and 30,000 meters; used for the broadcasting of radio and television signals.

Definitions from Wiktionary.