What is the average speed at which sound travels through air at sea level and 70F/20C degrees?

The average speed at which sound travels through air at sea level and at a temperature of 70°F (20°C) is indeed approximately 1128 feet per second, or 343 meters per second. This value is influenced primarily by the temperature of the air; as the temperature increases, the speed of sound also increases due to the greater energy and faster movement of air molecules.

At 70°F, air is at a temperature where the speed of sound is optimized, reflecting standard conditions used in many scientific calculations. Therefore, when measuring sound waves in air under these conditions, utilizing the value of 1128 feet per second captures the correct average speed of sound accurately.

The other options reflect various values which do not correspond to the established average speed of sound at this particular temperature and atmospheric pressure. Understanding this benchmark speed is crucial for various applications in audio technology and acoustics, enabling professionals to calculate delays, distances, and various acoustical phenomena accurately.