Distortion

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. - 187

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. - 166

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. - 167

Question: What is video?
  Answer: Video is the moving pictures, images, text, or graphics that are displayed on a television or computer monitor. Video also refers to the electronic equipment for the transmission, reception and production the television picture. - 188