6. [15 marks] [10-15 minutes] 51 f _ 1 62f 6x2 v2 6:3 is an equation of a l-dimensional wave. Show that the function f (set) = Asin[B(xi vr)] satises this equation and hence describes a wave motion. If f has the dimensions of electric field, what are the units of the constants A and B? [Hint just substitute the function in both sides (left and right} and show that you get the same result]