USCG Exam PracticeLight List, ranges, and light characteristics
An Occulting light differs from a Flashing light in what fundamental way?
- A. Occulting produces groups of flashes; Flashing produces single flashes
- ✓ Occulting has a longer period of light than darkness; Flashing has a shorter period of light than darknessCorrect
- C. Occulting alternates colours; Flashing shows only one colour
- D. Occulting has equal periods of light and darkness; Flashing has unequal periods
Why B is correct
By definition, Occulting (Oc) is a continuous light interrupted by eclipses where the duration of light exceeds the duration of darkness, which is the opposite of Flashing (Fl), where the duration of light is shorter than the duration of darkness. Equal periods describe Isophase, not either of these characteristics.