1. Reactance (X) Two components Due to mass (Xm)
Greatest at high frequencies
Due to stiffness (Xs)
Greatest at low frequencies 1

2. 2

3. Total Impedance [ R2 + (Xm – Xs)2 ] Z =
Impedance of a medium = Characteristic impedance
[ R2 + (Xm – Xs)2 ] 3

4. Sound traveling from one medium to another
Depending on the impedance of the two media
Reflection
Transmission
Absorption 4

5. Reverberation Depends on absorption and volume.
Greater the volume: Greater the reverberation
Greater the absorption: Lesser the reverberation
Reverberation time (RT): Time taken for a sound to reach some proportion of its original pressure. 5

6. Interactions between incident (original) and reflected waves
Constructive interference or reinforcement
Destructive interference or cancellation 6