What are the thing that produced soft and loud sounds?
Everything that makes sounds?
High sounds are usually heard when you play the keys of a piano that are on your right; they have shorter wavelengths than low sounds. Low sounds are usually heard when the keys on a piano's left end are played; they have long wavelengths. Soft sounds are quiet and can't render your ears deaf. Loud sounds that are over 85 decibels can damage your hearing.