What are some factors that affect the intensity of sound?

Intensity of sound is defined as the energy propagated through unit area. The energy here is nothing but the energy possessed by the particles of the medium as they get vibrated. So the energy is found to be due to each particle as 2 pi2 m a2 f2

Hence the intensity seems depending on:

1. mass of the particle ie medium

2. amplitude of vibration that too its square

3. square of the frequency of the vibration.