MHTCET 22 Apr 2025 Shift 1 Paper

Concept:The photoelectric effect is best explained by the photon theory of light, where light consists of discrete energy packets called photons.Explanation:Option A is incorrect because the wave theory of light fails to explain the cutoff frequency and instantaneous emission of electrons. The photoelectric effect requires Einstein's photon theory.Option B is incorrect because the maximum kinetic energy of a photoelectron depends on the frequency of incident light, not on its intensity. This is given by $K_{\max} = h\nu - \phi$.Intensity only affects the number of emitted electrons, not their maximum kinetic energy.Option C is incorrect because the stopping potential depends on both the frequency of incident light and the work function of the metal, not on the work function alone. This is expressed as $eV_{\text{stop}} = h\nu - \phi$.Option D is correct because higher intensity means more photons strike the metal per second, producing more photoelectrons. Hence, the saturation current increases with increasing intensity of incident light.Answer:Option D: The saturation current increases as the intensity of incident light increases.