Assuming you mean "tuba" and assuming you mean "why does the tuba play lower notes than the trumpet," the basic answer is, because the tuba is longer (it has more tubing).
I din't know them either, I play the tuba.
The trumpet and tuba have 3 keys but not 3 notes. Brass instruments have many notes.
The brass family such as trumpet, cornet, french horn, euphonium and tuba.
The tuba plays in the brass instruments. In the same group as the saxophone, trumpet, etc.
No CNET in Bb Tuba is in BBb or also known as C
They are the same.I think? A cornet is shorter because of the way it is configured but they both have the same length of tubing.
Tuba, it is the longest so it creates the lowest tones. In order it would be tuba, baritone and trombone. Baritone and trombone are basically the same but baritone sounds a bit better at the lowest part of its range.
Horn, Trumpet, Trombone, and tuba.
They all change notes with the use of valves, while the trombone uses a slide.
trumpet, trombone, baritone, tuba, and french horn
Tuba is from the Latin for horn or trumpet.