There are experiments going on all around the world, but the main countries with wave energy farms are:Portugal (near Oporto)UK (Scotland and England)Australia (Western Australia and Victoria)US (Reedsport, Oregon).
Pelamis Wave Energy Converter
I don't think there is any upper limit, but the longest used in practice are in long wave radio transmission, this can be around 1500 meters
Energy carried in a sound wave is all around us but energy carried in a ball is causing friction within the ball which is giving it energy
Yes
eletrical
Yes.
Visible Light is used with Spectroscopes.
It moves energy through space.
You can use them with fishing or when your sailing. it will push your boat/fish round. Also, waves can be used to generate energy. This is a sustainable way to get energy, and is simply known as Wave Energy, or Wave Power.
There are many different kinds of waves, and many different kinds of wave energy, and many different kinds of equipment used to produce such energy. For example, a lightbulb, since light is a form of electromagnetic wave.
The world's first commercial wave farm is based in Portugal, at the Aguçadora Wave Park, with a capacity of 2.25MW. It will soon be expanded to give it a capacity of 21MW. There are other pilot schemes of various designs all over the world.