When we refer to vibrations – frequencies we first refer to what physics defines as a wave. Sound is the result of the oscillation of air molecules with pulsating movements from the moment a body is set in motion, vibration or oscillation.
Sound is a form of energy that travels in space, the frequency of a wave is related to its energy. The more energy the wave has the farther it can reach. For example, a low frequency has more energy than a high frequency and causes more vibration.