Contrabass is anything lower than bass, eg. contrabass sarrusophone
To provide for deeper/lower sounds that you can't get from the short strings of an ukulele.
Generally the Bari Sax, Bass Sax, and Contrabass Sax play in the lower range.
Contrabass bugles are in key of G, which is lower than B flat. However B flat contras are becoming more common. Convertable tubas are the hot ones now in B flat.
Its so fun.
Assuming "slow vibrations", means low frequency, then any instrument that plays in the bass register would fill that bill. Bass clarinet (or the lower and rarer contra-bass), bassoon, baritone saxophone (or the much rarer bass sax) come to mind.
The oboe is larger than the piccolo. The largest woodwind instrument is the contrabass saxophone.
Soprillo, Sopranino, Soprano, Alto, C melody, Tenor, Baritone, Bass, Contrabass, Sub contrabass.
It has to sound lower than the bass instrument in that family, eg. contrabass saxophone. You can go one better: the subcontrabass. Don't expect to see one in your local orchestra anytime soon, they're very rare.
No, the contra-bass tuba is much larger than the C tuba.
The baritone sax is quite a bit larger and has a much lower sound than the alto sax. They both play in the same key, though, the key of E flat, which makes it easy to read the music for both instruments.
No, the double bass is the largest and lowest.