How often does a flashing light flash?

A flashing light is defined as one that emits a beam of light for a specific duration followed by a period of darkness. The standard for a flashing light, particularly in maritime contexts, is that it must flash at least 120 times per minute. This rate ensures that the light is sufficiently conspicuous and can be easily recognized by mariners as a navigational aid or warning signal.

The criteria for identifying various types of light signals include distinguishing between various flashing patterns and their rates of repetition. A light flashing at 120 or more times per minute meets the requirements for high visibility, which is crucial in navigation to prevent collisions and ensure safe passage.

While other rates are specified for different types of signals, the minimum rate for a flashing light that can be classified as such is indeed 120 flashes per minute, making this the correct answer.