A Level Physics Practice Exam

In physics, frequency is defined as the number of wave cycles that occur in a given time period, typically measured in seconds. This quantifies how often a repeating event, such as a wave, happens within one second and is expressed in hertz (Hz). For instance, if a wave completes 10 cycles in one second, its frequency is 10 Hz. This concept is fundamental in various applications, including sound, light, and radio waves, where frequency determines properties like pitch in sound and color in light. Understanding frequency helps to analyze wave behaviors and interactions in different mediums. Other options describe related but distinct concepts: wave speed relates to how quickly the wave propagates through a medium; distance traveled concerns the total path length, not the cycles; and amplitude refers to the maximum extent of a wave's displacement from its rest position, indicating energy rather than frequency.