1.2 Introduction
1.2 Constructive and Destructive Iinterference
1.2 Phase
1.2 Standing Waves
1.2 Summary
Unit 1.1 Multiple Choice Questions - Waves
Unit 1.1 Multiple Choice Answers - Waves
 

Unit 1.2 Summary

Interference — The effect of two waves passing through the same region of space at the same time.

Superposition Principle — the resultant displacement at any point and time is the sum of their separate displacements.

Constructive Interference — the amplitude of the final wave is larger than the amplitude of the larger wave.

 constructive interference1

Fig S1 - Constructive interference with two wave of the same amplitude and phase...

Constructive Interference — the amplitude of the final wave is larger than the amplitude of the larger wave.

 interference 4

Fig S2 - Constructive interference with two wave of the same amplitude and a phase difference of π/5 ...

Constructive Interference — the amplitude of the final wave is larger than the amplitude of the larger wave.

constructive interference 3

Fig S3 - Constructive interference with two wave of the same amplitude and a phase difference of π/2 ...

Constructive Interference — the amplitude of the final wave is larger than the amplitude of the larger wave.

 interference

Fig S4 - Destructive interference with two wave of the same amplitude and a phase difference of /5 ...

Destructive Interference — the amplitude of the final wave is smaller than the amplitude of the larger wave.

constructive interference 2

Fig S5 - Destructive interference with two wave of the same amplitude and exactly out of phase (π)...

Destructive Interference — the amplitude of the final wave is smaller than the amplitude of the larger wave.

interference

Fig S6 - Constructive interference with two wave of the same amplitude and a phase difference of /5 ...

Destructive Interference — the amplitude of the final wave is smaller than the amplitude of the larger wave.

 interference

Fig S7 - Constructive interference with two wave of the same amplitude and a phase difference of /2 ...

Constructive Interference — the amplitude of the final wave is larger than the amplitude of the larger wave.

— Waves traveling on a string of fixed length interfere with waves that have reflected off the end and are traveling back in the opposite direction.

— At resonant frequencies, standing waves can be produced in which the waves seem to be staationary rather than traveling.

— Points of constructive interference (maximum amplitude of vibration) are called antinodes and points of destructive interference (minimum amplitude of vibration) are called nodes.

 

Concept by Kishore Lal. Programmed by Kishore Lal... Copyright © 2015 Kishore Lal. All rights reserved.