Frequently Asked Questions (FAQ's)
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