Sound is a longitudinal wave. whenever someone speak it provide
energy to the medium particles. by mean of which medium particle
starts vibration. Sound wave is a longitudinal wave its mean the
medium particles vibrate parallelerly to the propagation of wave.
surrounding is not a perfect medium due to which sound waves
countinous loses its energy as it moves further away.if someone
speak loudly its mean it releases high amount of energy in the
environment due to which medium particles vibrates with larger
amplitude and sound wave travels long distance too.
If someone moves away from the source and observing the same
intensity of sound wave its mean his surrounding air particles
vibratings with the same amplitude as before.
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