The equation of wave travelling in a medium is `y = 5 cos pi` (100t -x)`. The wavelength of the wave is

Explanation

The given equation is y = 5 `cospi(100t - x)`
y = 5 `cos(100pit - pix)`
standard equn is y = a cos(wt + kx)
where k = `(2pi)/lamda` Comparing k = `(2pi)/lamda` = 2units.