Interference

Definition

Interference is the phenomenon that occurs when two or more waves overlap and combine to form a new wave pattern. The resulting wave can be either constructive or destructive, depending on the phase relationship between the waves.

5 Must Know Facts For Your Next Test

1. Constructive interference occurs when waves are in phase, resulting in an increased amplitude.
2. Destructive interference happens when waves are out of phase, leading to a reduced or nullified amplitude.
3. Interference patterns can be observed in various types of waves, including sound, light, and water waves.
4. The principle of superposition states that the resultant displacement at any point is the sum of the displacements due to individual waves.
5. Young's double-slit experiment is a classic demonstration of interference with light waves.

Review Questions

• What is the difference between constructive and destructive interference?
• How does the principle of superposition relate to wave interference?
• Describe how Young's double-slit experiment demonstrates interference.

Related terms

Constructive Interference:

A type of interference where wave amplitudes add together because they are in phase, resulting in a higher amplitude.

Destructive Interference:

A type of interference where wave amplitudes subtract from each other because they are out of phase, potentially canceling each other out.

Principle of Superposition: $$\text{A principle stating that when two or more waves overlap, the resultant displacement is equal to the algebraic sum of their individual displacements.}$$