DL=|L2-L1|=xx l
f
= xx p
Due to both wave 1 and wave 2 (the resultant)
Due to wave 2 only
Due to wave 1 only
Displacements of air particles at P
interference
Wave 2
L2
S2
S1
L1
Wave 1
The sound point sources S1 and S2 are in phase.
Interference and phase difference
2-4 Interference
P