A resonator is a device or system that exhibits resonance or resonant behavior. The two are tuned to resonate at the same resonant frequency. Light confined in the cavity reflects multiple times producing standing waves for certain resonant frequencies. An LC circuit, oscillating at its natural resonant frequency, can store electrical energy. In resonant circuits they tune radios to particular frequencies. The sounds may further be modulated by membranous coverings and by resonant cavities. Both were adjusted to the same resonant frequency. Two of these are required to set the bandwidth and resonant frequency. He++3 effects of Resonant and nonresonant interactions with transverse waves. Sound is further shaped by the characteristics of the guitar body's resonant cavity. This excites the air contained in the usually cylindrical resonant cavity within the flute. The two circuits interacted to form a resonant transformer. In contrast to existing implementations it is compatible with both inductive and resonant charging. Maple drums are favored for their bright resonant sound. Conceivably, a nearby supernova might be strong enough to be seen without resonant amplification.