What is the "flash to bang" method used to measure?

The "flash to bang" method specifically measures the time interval between seeing a lightning flash and hearing the subsequent thunder. This method is a practical technique used to estimate how far away a storm is, based on the known speed of sound and light. Light travels much faster than sound, so when you see the flash of lightning, you start counting until you hear the thunder (the bang). The time difference helps to determine the distance of the storm; for every five seconds counted, the storm is approximately one mile away.

This method is particularly valuable for athletes and trainers during outdoor activities, as it helps in assessing the safety of the environment when thunderstorms are possible. The other options do not accurately describe the function of the "flash to bang" method. While the method can indeed provide information that informs about the distance of the storm, the primary focus is on the time interval indicated in the correct answer.