Two identical sinusoidal waves with wavelengths λ = 3 m, travel in the same direction with the same speed. The two waves start at the same instant (t_0,1 = t_0,2 = 0 sec), but they differ by their path difference. Wave-1 travels a distance x1 to get to some observation point, while wave-2 travels a distance x2. If the path difference, Ax = x2 - x1, between the two waves is 2 m, then the phase difference between the interfering waves is: O p = 2π O 4 = π/2 O p = 4π/3 O p = π/4 O p = 3n

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Interference of sound

Seiche

A seiche is an oscillating standing wave in a body of water. The term seiche pronounced saysh) can be understood by the sloshing of water back and forth in a swimming pool. The same phenomenon happens on a much larger scale in vast bodies of water including bays and lakes. A seizure can happen in any enclosed or semi-enclosed body of water.