a wave travelling along the x-axis is described by the equation y(x,t)=0.005 cos(lx-mt).if the wavelength and the time period of the waves are 0.08m and 2.0s respectively,then l and m in appropriate units are.
plse explain
l=k=2.pi/lambda
m=omega=2.pi/T
Direct substitution should get the ans.
= 2pi/lambda - 2pi/T
= 1/lambda - 1/T