In regards to physics, audio is a resonance that travels via a transmission tool like a gas, fluid, or strong as an acoustic wave.Sound is the function of these waves and also the brain's assumption of them in terms of human physiology as well as psychology. Only acoustic waves with frequencies between approximately 20 Hz and also 20 kHz, or the audio frequency variety, can cause a human to have an auditory sensation. These are sound waves with wavelengths ranging from 17 metres (56 feet) to 1.7 millimetres in air at atmospheric pressure (0.67 in). Ultrasounds are sound waves with a frequency higher than 20 kHz that are faint to people. Infrasound describes appear regularities below 20 Hz. Pets of different species have various hearing varieties.
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