A wave `y = A cos(omega t – kx)` passes through a medium. If V is the particle velocity and a is the particle acceleration then,

Options

A. y,V and .a. all are in the same phase
B. y lags behind V by a phase angle of `pi/2`
C. a. leads y by a phase angle of `pi`
D. V. leads a by a phase angle of `(3pi)/2`

Answer

B, C, D