Sound waves are due to the mechanical vibrations created by an object. Example a tuning fork or the cone of a speker. Sound waves requires a media, either air or a material solid or liquid. Sound does not travel in vaccum. Example : An electrical bell vibrating inside a vaccum jar can not be heard. Sound gets reflected from objects.You may be hearing echos in a big room when you are alone in a large room. Sound (or sound energy) gets absorbed by varous objects like human beings, objects like non rigid porous materials, fibrous mats.
Sound has speed. It is much less than light. That is why you here thunder sometime after lightening. Laws of reflection of sound is similar to that of light. Sound has a fixed speed/ velocity in a fixed media.It 's velocity is much higher in solids and liquids than in air.
The sound waves are characterised by wave length, frequency, amplitude of the vibrarating object. Sound waves (transeverse) propagates (amplitudes against the wavelength) in a sinusoidal type or just like a sine curve.
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