1) Resonance: The size of an object can affect its resonance frequency. Resonance frequency is the frequency at which an object vibrates most readily. When an object is struck or disturbed, it will vibrate at its resonance frequency. The larger the object, the lower its resonance frequency. This is because larger objects have more mass, and it takes more energy to vibrate a more massive object.
2) Pitch: The pitch of a sound is determined by its frequency. The larger the object, the lower the frequency of its sound, and therefore the lower its pitch.
3) Timbre: The timbre of a sound is determined by its overtones. Overtones are the higher frequencies that are present in a sound in addition to the fundamental frequency. The size of an object can affect the number and intensity of its overtones. Larger objects tend to have more overtones, which gives them a richer, fuller sound.
So, in general, larger objects produce lower-pitched sounds with a richer timbre than smaller objects.