I think i know how the ramjet works at supersonic speeds, because of the shock wave the air particles traveling through the inside of the tube converge and bump into each other and because the air cannot expand it slows down, increasing the pressure, so when the air escapes it expands very...
ok, but if i am thinking of a speaker, what is actually coming out of it, are there lots of individual sound waves (transverse or longitudinal) ? or it just one big pulse of energy? like this...
In textbooks etc. they are shown like the sine or cosine graphs, but this isn't what they actually look like as the travel through space is it? Surely they would be 3D e.g. a sphere of energy spreading in all directions from the source. Any info on the properties of all types of waves would be...