When nonmonochromatic light is utilized in a photoelectric effect...

According to Einstein's photoelectric equation, the maximum kinetic energy of emitted photoelectrons is given by K_\max = \dfrac{hc}{\lambda} - \Phi, where $\lambda$ is the wavelength of the incident light and $\Phi$ is the work function of the material.

The stopping potential $V_0$ is related to the maximum kinetic energy by eV_0 = K_\max.

When nonmonochromatic light is used, it consists of a range of wavelengths. The photoelectrons with the maximum kinetic energy are those emitted by the incident photons with the highest energy.

Since the energy of a photon is inversely proportional to its wavelength ($E = \dfrac{hc}{\lambda}$), the highest energy photons correspond to the shortest wavelength present in the incident light.

Therefore, the maximum kinetic energy, and consequently the stopping potential, depends on the shortest wavelength of the incident nonmonochromatic light.