A wave travelling along the x-axis is described by the equation y(x,t)=0.005cos(αx−βt). If the wavelength and time period of the wave are 0.08 m and 2.0 s respectively, then α and β in appropriate units are
a. α = 25.00π, β = π
b. α = 0.08/π, β = 2.00/π
c. α = 0.04/π, β = 1.00/π
d. α = 12.5/π, β = π/2.00