Question

Which describes the motion of the media for a surface wave?
a The motion is perpendicular to wave direction.

b The motion is both parallel and perpendicular to wave direction.

c The motion is parallel to wave direction

Answer 1

    For a surface wave the wave propagates along the width of the lake. Wave propagates along the surface. It spreads out.

   The particles on the surface of water, move (oscillate) up and down about the mean level. They do not move sideways. Only the disturbance propagates. 

So option (a) is the correct option.