It can't travel in a vacuum

Usage examples of soundwave.

They'll bung you in a soundproofed cell with some other soundwaves and you'll serve your time bouncing around the walls till your trial comes up.

Two guards appeared in the doorway, one holding a grey cladded box, the other a sound gun - a sort of inverted umbrella speared by a receiving aerial that could capture any soundwaves that foolishly tried to make a break.

The highly powered microphone 'received' Ernest's soundwave, sucked it back down the corridor and trapped it in the gun's holding chamber.

It had two oval matrixes that suggested compound eyes shaded by complicated delicate, extendable metal vanes, a pair of protruding concave surfaces that were probably soundwave collectors, and more openings and louvers about its lower face, possibly inlet/outlet ducts for coolant gas.

Then came the soundwave with its deafening shock, and after that a blast of wind that knocked the army down.

His own voice boomed oddly in his ears, the soundwaves distorted by the perpetual twisting of space around him, but evidently there was something unchanging in the voice patterns which his worm program still recognized.

The reverberant boom sounded like a loud explosion, and the shape of the drum directed soundwaves deep into the heart of the dune, into the strata of deposited sand.