My only doubt was in the equation of standing wave y=2Asin(wt)cos(kx)
What is the amplitude of wave
2A or A??
@Pratik-Patil Standing wave is a SHM of many particles together , and so every particle is doing SHM so if we compare above eqn with eqn of SHM which is x= A sinwt we get 2Acos(kx) as amplitude which can be easily verified by the figure of Standing wave as particle present at mean position have max amplitude whereas node have zero amplitude,which shows amplitude of standing wave depends on x.