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How does sound waves travel in water
Sound waves are longitudinal waves
The displacement of water particles of medium is parallel to direction of wave propagation
Transfer of energy is via changing pressure
Why waves travel faster in water/solid than in air
Water molecules are more closely packed together than gas particles,
enabling faster transfer of vibrational energy between molecules
Progressive Longitudinal Wave
Progressive → There is Energy transfer
Longitudinal → The direction of energy transfer of wave is parallel to direction of particle displacement
I = P/A
A → 4 x pi x r²
Surface Area of Sphere
Polarising Sheet
I=Io(cosx)²
When passing thru first sheet, intensity is halved

Standing Wave
A n C are in phase but out of phase with B by
180• or pi rad