Q86 / 90 · JEE Main 2024 (30 Jan Shift 2) · Physics

For the photoelectric effect, the maximum kinetic energy $(E_{k})$ of the photoelectrons is plotted against the frequency $(v)$ of the incident photons as shown in figure. The slope of the graph gives

Solution

Comparing Einstein's equation $K_{\max} = h v - h v_{0},$ with $y = m x + c,$ we get slope, $m = h$ , which is Planck’s constant.

Hence, the correct answer is option: 'D'.