In a photoelectric effect experiment, monochromatic light of wavelength \(\lambda\) is incident on a metal surface, ejecting electrons with a maximum kinetic energy \(K_0\). When the same metal surface is illuminated instead with light of wavelength \(\dfrac{2}{3}\lambda\), the maximum kinetic energy of the ejected electrons is \(2K_0\). In terms of \(\lambda\), what is the maximum wavelength of light that can cause photoelectron emission from this metal surface?