The graph shows the maximum kinetic energy of electrons emitted by a photosensitive surface as a function of the frequency of the incident radiation. The slope of this curve represents
A) the intensity of the incident radiation.
B) the maximum kinetic energy.
C) the threshold frequency.
D) Planck's constant.
E) the stopping potential.

Question

The graph shows the maximum kinetic energy of electrons emitted by a photosensitive surface as a function of the frequency of the incident radiation. The slope of this curve represents
A) the intensity of the incident radiation. 
B) the maximum kinetic energy. 
C) the threshold frequency. 
D) Planck's constant. 
E) the stopping potential.

Quizplus · Accepted Answer

The slope of this graph represents Planck's constant, denoted by the symbol h. Planck's constant is a fundamental constant of nature that relates the energy of a photon to its frequency. The equation that relates the maximum kinetic energy of electrons emitted by a photosensitive surface to the frequency of the incident radiation involves Planck's constant, which allows us to determine it from the slope of the graph.

The Graph Shows the Maximum Kinetic Energy of Electrons Emitted