I think the answer is transverse, because progressive waves can be either transverse or longitudinal.
So I don't have to say "Transverse progressive waves" ? Yeah it is transverse, but do I ALSO state they have to progressive? Do they? Can you polarise non-progressive waves?
So I don't have to say "Transverse progressive waves" ? Yeah it is transverse, but do I ALSO state they have to progressive? Do they? Can you polarise non-progressive waves?
They don't have to be progressive. Standing waves can also be polarised, although it's not talked about very much as there aren't many applications