Destructive interference

Definition

Destructive interference occurs when two waves superimpose to form a resultant wave of lower amplitude. This happens when the crest of one wave aligns with the trough of another, effectively canceling each other out.

5 Must Know Facts For Your Next Test

1. Destructive interference results in a reduction or complete cancellation of wave amplitude.
2. It occurs when waves are out of phase by $\pi$ radians (180 degrees).
3. The principle of superposition is fundamental to understanding destructive interference.
4. Destructive interference can be observed in sound waves, light waves, and water waves.
5. In practice, perfect destructive interference rarely occurs over an extended area due to variations in wave properties.

Review Questions

• What phase difference between two waves leads to destructive interference?
• How does the principle of superposition relate to destructive interference?
• Give an example where destructive interference can be observed in everyday life.

Related terms

Constructive Interference:

Occurs when two waves combine to form a resultant wave with greater amplitude than either of the individual waves.

Phase Difference:

The amount by which one wave lags behind or leads another, typically measured in radians or degrees.

Superposition Principle:

\The principle stating that when two or more waves overlap, the resultant displacement is equal to the sum of their individual displacements.