Question

how is sound propogated​

Answer 1

Sound propagates through air as a longitudinal wave. The speed of soundis determined by the properties of the air, and not by the frequency or amplitude of the sound. Sound waves, as well as most other types of waves, can be described in terms of the following basic wave phenomena
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Answer 2

Sound waves are mechanical waves which need a medium for their Propogation. Sound needs Solid, Liquid or Gas to Propogation itself in the form of vibrations.