Question: What is audio?
Answer: Audio is sound frequencies or signals in the audible range. It also refers to the electronic equipment that is used for the recording, transmission, reception, or reproduction of sound.
Question: What audio frequencies can be heard by the human ear?
Answer: The human ear can hear sound wave frequencies in the approximate range of 20 to 20,000 Hertz.
Question: How fast does sound waves travel?
Answer: At sea level, sound vibrations travel in the air at a speed of approximately 1087 ft. (331 m) per second.