1. Chapter 15: Wave motion

3. Wave equation
Dispersion relation

4. The principle of superposition
General case
Making a square wave
At t=0 we have
End of rope is fixed

13. Reflection and Transmission
Wave pulse reaches a discontinuity
Wave pulse is partly reflected and transmitted
End of rope is fixed
End of rope is free

14. Two waves pulses pass each other
destructive
constructive

15. Interference of Waves Light plus light gives darkness when Φ=180
Constructive
Destructive
Light plus light gives darkness when Φ=180

16. partially destructively
Two waves interfere
destructively
partially destructively
constructively

17. Standing Waves
The frequency at which standing waves are produced are the natural frequencies or resonant frequencies

19. Resonant waves in a cavity

20. Law of reflection

21. Refraction

22. Deriving the wave equation