Which term is used to describe the interference of two out-of-phase waves that yields a lower amplitude?

Which term is used to describe the interference of two out-of-phase waves that yields a lower amplitude?

• A. Destructive interference
• B. Constructive interference
• C. Deconstructive interference
• D. Neutral interference

Answer: (C)

Two waves combine by superposition, and the resulting amplitude depends on their phase relationship. When the waves are out of phase by half a cycle, their peaks align with the other’s troughs, so their displacements subtract and the overall amplitude decreases. If the amplitudes are equal, they cancel completely; if not, the amplitude is reduced but not zero. This behavior is described as destructive interference. In contrast, when waves are in phase, they reinforce each other and the amplitude increases (constructive interference). The term deconstructive interference isn’t standard, and neutral interference isn’t used to describe this effect.

Two waves combine by superposition, and the resulting amplitude depends on their phase relationship. When the waves are out of phase by half a cycle, their peaks align with the other’s troughs, so their displacements subtract and the overall amplitude decreases. If the amplitudes are equal, they cancel completely; if not, the amplitude is reduced but not zero. This behavior is described as destructive interference. In contrast, when waves are in phase, they reinforce each other and the amplitude increases (constructive interference). The term deconstructive interference isn’t standard, and neutral interference isn’t used to describe this effect.