A mute must be used. They cost around £5 from any music shop, and can be clipped into the instrument.
The pitch in an instrument can be how large or small the instrument is - as in small instruments are pitched higher and big instruments are pitched lower. In woodwind and brass instruments the volume is determined by how hard you blow down the instrument. On the piano it is how hard you press down on the keys. On an orchestral string instrument it is how softly you draw the bow across the strings. On a guitar it is how hard you pluck the strings.
A tuba.
No.
Brass instruments are different from all the other instruments in that the person playing is solely responsible for the sound of the instrument. Brass instruments require the player to buzz their lips in the mouthpiece. This sound reverberates throughout the instrument and produces the sound that comes out of it. This differs from other instruments, where the player makes part of the instrument vibrate (i.e. reed, string, drum head). The pitch of brass instruments is then changed by changing the frequency of the vibrations created by the lips. If you buzz your lips at a higher pitch, the instrument plays a higher note. The opposite is also true. Buzzing your lips at a lower pitch creates a lower note.
The Cello or the Bass.
Thicker strings give lower notes
It depends on the thickness of the string. But the longer the string, the lower the note
The valves in a brass instrument re-direct the air into different parts of the tubing. Each valve controls a different part of the instrument. The longer the tubing, the lower the note will be.
Yes, brass instruments produce a lower pitch than woodwind instruments. Woodwind instruments use a reed to vibrate the air to produce sound, whereas brass instruments produce sound from the player's lips vibrating in a mouthpiece.
It can be either, depending on how well you can play it. In general, a Trombone is a bass instrument, playing in the bass clef, making it a relatively low-pitched instrument.
No. Wind instruments and drums are much lower.
Lower. By increasing the length of the air column in the instrument, the wavelength of the sound produced is longer, resulting in a lower pitch.