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What are the characteristics of progressive waves?

1.A progressive wave is one which travels through the medium undamped and unobstructed.

2.Each particle in the medium vibrates to and fro about its mean position simple harmonically with th same amplitude and frequency.

3.The to and fro motion of the particles produce condensations and rarefactions which travel in the direction of propagation of the wave.

4.Particles separated by an integral multiple of ? have same displacement,velocity and acceleration at any instant.

5.Energy is transferred from particle to particle and there is no transfer of matter,what soever.

6.The vibration of each particle begins a little later than that of its predecessor.