9.1 What are Waves?

Water wave is an example of a 2D wave that propagates along a surface.

Notice the bob does not travel with the wave. The motion of the wave particles are different from the “motion” of the wave.

Each medium particle oscillate about its own equilibrium position. Their oscillatory motion result in the propagation of the energy/momentum.

You have been taught that sound is a wave since primary school. But how do we know that sound is a wave and not a stream of particles?

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