"Flash-to-bang" is a term used to describe the time interval between seeing a flash of light and hearing the corresponding sound. This concept is often applied in various fields, including meteorology and military operations. For example, when observing a lightning strike, the flash is seen first, followed by the sound of thunder, which can help estimate the distance of the storm. The principle behind "flash-to-bang" is based on the difference in the speed of light and sound. Light travels much faster than sound, so there is always a delay between the two. This delay can be measured in seconds, with each five-second interval indicating that the event is approximately one mile away, such as in the case of thunderstorms.