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The energy of a photon depends on the following parameters: Photon’s energy is directly related to the photon’s electromagnetic frequency. Photon’s energy depends on wavelength in such a way that the energy of the photon is inversely proportional to the wavelength. The higher the photon energy frequency, the higher its energy.
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Photon energy is the energy carried by a single photon. The amount of energy is directly proportional to the photon's electromagnetic frequency and thus, equivalently, is inversely proportional to the wavelength. The higher the photon's frequency, the higher its energy. Equivalently, the longer the photon's wavelength, the lower its energy.
For example, if a red photon of frequency \(f\) encounters a molecule that has an energy step, \(\Delta E\), equal to \(hf\), then the photon can be absorbed. Violet flowers absorb red and reflect violet; this implies there is no energy step between levels in the receptor molecule equal to the violet photon’s energy, but there is an energy step for the red.
For example, if a red photon of frequency f f encounters a molecule that has an energy step, Δ E, Δ E, equal to hf, hf, then the photon can be absorbed. Violet flowers absorb red and reflect violet; this implies there is no energy step between levels in the receptor molecule equal to the violet photon’s energy, but there is an energy step for the red.
- Ionizing Radiation
- Visible Light
- Lower-Energy Photons
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A photon is a quantum of EM radiation. Its energy is given by E = hf and is related to the frequency f and wavelength λof the radiation by E=hf=hcλ(energy of a photon)E=hf=hcλ(energy of a photon), where E is the energy of a single photon and c is the speed of light. When working with small systems, energy in eV is often useful. Note that Planck’s c...
The range of photon energies for visible light from red to violet is 1.63 to 3.26 eV, respectively (left for this chapter’s Problems and Exercises to verify). These energies are on the order of those between outer electron shells in atoms and molecules. This means that these photons can be absorbed by atoms and molecules. A single photon can actual...
Infrared radiation (IR) has even lower photon energies than visible light and cannot significantly alter atoms and molecules. IR can be absorbed and emitted by atoms and molecules, particularly between closely spaced states. IR is extremely strongly absorbed by water, for example, because water molecules have many states separated by energies on th...
Photon energy is responsible for many characteristics of EM radiation, being particularly noticeable at high frequencies.Photons have both wave and particle characteristics.gamma ray: also γ-ray; highest-energy photon in the EM spectrum ionizing radiation:radiation that ionizes materials that absorb it x ray: EM photon between γ-ray and UV in energy bremsstrahlung: German for braking radiation; produced when electrons are decelerated characteristic x rays:x rays whose energy depends on the material they were produced ...
Example 2: Photon Energy and Effects for UV. Short-wavelength UV is sometimes called vacuum UV, because it is strongly absorbed by air and must be studied in a vacuum. Calculate the photon energy in eV for 100-nm vacuum UV, and estimate the number of molecules it could ionize or break apart. Strategy
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Dec 14, 2022 · How to Calculate the Energy of a Photon. There are two main equations for calculating the energy of a photon: E = hν. Here, E is the photon energy, h is Planck’s constant, and ν is the photon frequency. E = hc / λ. Here, E is photon energy, h is Planck’s constant, c is the speed of light, and λ is the photon wavelength. References
