A plane wave is represented by   x=1.2sin(314 t+12.56y)Where x and y are distances measured along in x and y direction in meters and t is time in seconds. This wave has

The given equation representing a wave travelling along –y direction (because ‘+’ sign is given between t term and x term). On comparing it with  x=Asin ω t+kyWe get k=2πλ=12.56⇒λ=2×3.1412.56=0.5 m