2.4 Superposition and Interference Flashcards
1
Q
What is the definition of coherent?
A
Waves have the same frequency and a constant phase difference.
2
Q
What is the principal of superposition?
A
When 2 or more waves meet in a medium, the resultant displacement of the medium at any point in space is equal to the vector sum of the displacement of each individual wave at that point.
3
Q
How can constructive interface occur?
A
- Waves are in phase.
- Both have same sign displacement (++).
4
Q
How can destructive interface occur?
A
- Waves meet in antiphase.
- Have opposite sign displacement (+-)
5
Q
What are standing/stationary waves?
A
Waves in which no energy is transferred.
6
Q
How is a standing wave formed?
A
Standing waves are set up when two waves meet that have the same frequency, speed and amplitude and are travelling in opposite directions.
7
Q
What are nodes?
A
- Created where destructive interface happens.
- Points of 0 displacement and don’t move.
8
Q
What are antinodes?
A
- Created where constructive interface happens.
- Points with maximum displacement and move.
