What is wave particle duality?

What do you understand by the term waveparticle duality? Where does it apply?

What is wave pulse ?

What is wave motion ?

What are alpha particles?

In a stationary wave, the particle velocity at the nodal points is

in a plane progaressive harmonic wave particle speed is always less than the wave speed if.

In case of mechanical wave, a particle oscillates and during oscillation its kinetic and potential energy changes. So, when particle is passing through mean position,