12 - Waves 2 Flashcards
1
Q
What happens when two waves pass through each other?
A
.Resultant displacement is the sum.
.Add together.
.Superpose - resultant wave with increased/decreased amplitude.
2
Q
How does friction effect a wave?
A
Wave energy not the speed.
3
Q
What are the conditions for superposition to work?
A
.Must be same type.
.Medium must behave linearly.
4
Q
Define coherence.
A
Waves from both sources have the same frequency and phase difference is constant. Observable fixed interference.
5
Q
What produces coherent light?
A
Lasers, not filament bulbs.
6
Q
What is the phase difference for waves in phase?
A
360 or 2pi.
7
Q
What is the phase difference for waves in antiphase?
A
180 or pi.
8
Q
What is the equation for phase difference?
A
x/λ x 360.
