4) 3) A wave is described by the function y (x, $)= 1. Som cos (59it ~ &TIX) what is the wavelength ? a) . 2 m 6 ) . 4 m c ) . 6 m d ) . 8 m e) 10 m5) In what direction does the wave move a) t X dinn b - x diru c ) ty dirn almy dirn() A wave is described by the function y (x, t)= 1. Som cos (5sit - 2TIX ) what is the speed of the 2) I m / s by 1.5mls c) 2 m / s d) 2.5m /s e ) 3 m / s