Question 278: Dual Nature of Matter and Radiation

Question

From photoelectric effect experiment, select the correct statement.

Accepted Answer

Option A:
Photoelectric effect can be explained using wave theory of light.
Ã¢ÂÂ Incorrect Ã¢ÂÂ The wave theory predicts continuous energy transfer and dependence on intensity, but experiments show cutoff frequency and instantaneous emission. The photoelectric effect requires the photon (particle) theory of light.
Option B:
The maximum kinetic energy of a photoelectron depends on the intensity of incident light.
Ã¢ÂÂ Incorrect Ã¢ÂÂ Maximum kinetic energy depends on the
frequency
of light, not its intensity. $ K_	ext{max} = h
u - \phi $. Intensity affects the number of electrons emitted, not their max kinetic energy.
Option C:
The stopping potential depends only on the work function of the metal.
Ã¢ÂÂ Incorrect Ã¢ÂÂ Stopping potential depends on the
photon energy relative to the work function
:
$    e V_	ext{stop} = h
u - \phi    $
So it depends on both frequency and work function (not only work function).
Option D:
The saturation current increases as the intensity of incident light increases.
Ã¢ÂÂ Correct Ã¢ÂÂ Higher intensity means more photons per second, which means more emitted electrons if frequency > threshold, so larger saturation current.
Ã¢ÂÂ
Correct Answer: Option D

Answer

Photoelectric effect can be explained using wave theory of light.

Answer

The maximum kinetic energy of a photoelectron depends on the intensity of incident light.

Answer

The stopping potential depends only on the work function of the metal.

Answer

The saturation current increases as the intensity of incident light increases.

Dual Nature of Matter and Radiation

From photoelectric effect experiment, select the correct statement.

Choose the correct answer: