3 ms·3.5 m is almost 12 feet, so 3 feet is almost a quarter wave.by boomlinde 2y ago3.5 m is almost 12 feet, so 3 feet is almost a quarter wave.carlmr 2y agoAh, my bad, didn't convert feet properly in my head. Not used to it.vel0city 2y agoI'll take half the blame for using such measures interchangeably in a single sentence. The metric system is the tool of the devil! My car gets forty rods to the hogshead and that's the way I likes it!