In a photoelectric effect experiment, monochromatic light of wavelength \(\lambda\) shines on a clean metal cathode with a cutoff wavelength of \(\lambda_0\), where \(\lambda < \lambda_0\). An opposing electric potential difference is applied across the tube to reduce the photocurrent to zero. Which of the following is a correct expression for the stopping potential \(\Delta V_s\) in terms of \(\lambda\), \(\lambda_0\), and fundamental constants?