Which statements describe elements? Elements can be separated using physical means.
Elements are made of atoms with the same atomic number.
Elements cannot be separated using ordinary chemical means.
Elements may be represented by chemical symbols.
Elements are made of two or more different types of atoms.

Elements are made of atoms with the same atomic number

The tuba is the biggest, and among the newest, of all the brass instruments. Tuba players create the low-pitched sound by making a kind of "buzz" with their breath against the mouthpiece and pressing the tuba's valves to form notes.

Explanation:

in other words it because less air molecules are abloe to go through the mouth peiece of the tuba