ASTRO 310 Graded Requirement 1 (GR1) Concepts Practice Test

Photon energy is tied to its frequency: E = hf, and since frequency f is related to wavelength by f = c/λ, the energy can also be written as E = hc/λ. This shows a direct inverse relationship between energy and wavelength. When the wavelength increases, the frequency drops, and so does the energy. For example, photons with longer wavelengths (like red light) carry less energy per photon than photons with shorter wavelengths (like violet light). In the limit, as wavelength becomes very large, the energy approaches zero.