If the wavelength of light in an experiment on photoelectric effect is doubled.
if wavelength of the light is doubled then the photons emitted energy becomes half.
Energy of photon = hv =
where h is plank’s constant and ν is the frequency which is where the c is the speed of light and{displaystyle lambda }
{displaystyle lambda } λ (Lambda) is wavelength.
∴ the stopping potential is the potential which is required to stop the max kinetic energy electron. if the energy of photon is decreased
the stopping potential also decreases.