Here's why:

* Frequency and Energy are Directly Proportional: The energy of an electromagnetic wave is directly proportional to its frequency. This means that as the frequency increases, the energy of the wave also increases.

* Planck's Equation: This relationship is described by Planck's equation: E = hν, where:

* E is the energy of the wave

* h is Planck's constant (a fundamental constant of nature)

* ν is the frequency of the wave

Example:

* Gamma rays have very high frequencies and therefore very high energies. They can cause significant damage to living tissue.

* Radio waves have very low frequencies and therefore very low energies. They are used for communication and broadcasting.

Other Factors:

While frequency is the primary factor determining the energy of an electromagnetic wave, other factors can also play a role, such as:

* Amplitude: The amplitude of a wave is related to its intensity, which is the amount of energy it carries per unit area.

* Wavelength: Frequency and wavelength are inversely proportional (higher frequency means shorter wavelength).

Let me know if you have any more questions!