The stopping potential when intensity is kept constant is:

Explanation

The stopping potential, in the context of the photoelectric effect, refers to the minimum potential difference (voltage) required to prevent the ejection of electrons from a metal surface when it is illuminated with light of a specific frequency or wavelength. The stopping potential depends on various factors, including the intensity (brightness) of the incident light. When the intensity of the incident light is kept constant, the stopping potential remains the same as long as the frequency (or wavelength) of the light is not changed. In the photoelectric effect, the energy of the incident photons is directly related to their frequency. The higher the frequency of the incident light, the higher the energy of the photons. The stopping potential is determined by the difference between the energy of the incident photons and the work function of the material (the minimum energy required to remove an electron from the surface). If the intensity is kept constant, changing the frequency of the light will alter the energy of the incident photons, but the stopping potential will remain the same. In summary, when the intensity of the incident light is kept constant, the stopping potential is not directly affected. It depends primarily on the frequency (or wavelength) of the light and the work function of the material.