What is the relationship between the energy (E) of a photon and its frequency (f)?

The relationship between the energy of a photon and its frequency is described by the equation ( E = hf ), where ( E ) represents the energy of the photon, ( h ) is Planck's constant, and ( f ) is the frequency of the photon. This equation shows that energy is directly proportional to frequency: as the frequency increases, the energy of the photon also increases.

This direct proportionality means that if you were to increase the frequency of the photon, you would correspondingly increase its energy. Conversely, a decrease in frequency would lead to a decrease in energy. Therefore, the correct answer illustrates that energy and frequency have a linear relationship where a higher frequency results in higher energy levels for photons.