Green photon energy
Green photon energy is the energy carried by a single photon of green light, determined by its wavelength and fundamental physical constants.
Also known as: 550 nm photon energy
How big is it?
2.253 eV of energy
Photon energy at 550 nm · derived from defined specimen
Typical recorded range: 2.247 eV to 2.259 eV.
A little perspective
About 1.27 times the clock-transition photon energy of Strontium-87 optical clock transition.
Strontium-87 optical clock transition: The strontium-87 optical clock transition is an energy change between two quantum states of strontium atoms that can set the timing of an optical atomic clock.
Measurements, assumptions & sources +
Green photon energy
A defined 550 nm photon carries about 3.61 × 10⁻¹⁹ J, calculated from exact c and h. Green light spans a range of wavelengths, so this is one explicit wavelength specimen.
NIST — 2022 CODATA fundamental constants
The marked photon energy at 550 nm is calibrated. Unmeasured illustration details are representative.
Strontium-87 optical clock transition
The strontium-87 optical clock transition carries photon energy near 2.85 × 10⁻¹⁹ J. Frequency shifts depend on controlled experimental conditions.
NIST — Compact strontium optical clock
The marked clock-transition photon energy is calibrated. Unmeasured illustration details are representative.
Change your perspective
Put it next to…
Choose a suggestion to redraw the comparison, or open its page to learn what it is.
Why this measurement?
Why we use 2.253 eV
For comparison, this page uses photon energy at 550 nm. This is labelled derived from defined specimen: an explicit comparison model rather than a claim that every example has the same value. The recorded range is 2.247 eV to 2.259 eV.
A defined 550 nm photon carries about 3.61 × 10⁻¹⁹ J, calculated from exact c and h. Green light spans a range of wavelengths, so this is one explicit wavelength specimen.
The identifying illustration and the numerical comparison remain separate. How calibrated comparisons work →
Recorded properties
Green photon energy dimensions and measurements
| Property | Selected value | Recorded range | Basis |
|---|---|---|---|
| 2.253 eV | 2.247 eV to 2.259 eV | derived from defined specimen |
Around this scale
Go smaller. Go bigger.
These links use compatible energy records, ordered around the selected value.
Nearest lower value · EnergyVisible photon2.247 eVA visible photon is a single particle of light within the range detectable by the human eye.Around the same scale · Fundamental physicsStrontium-87 optical clock transition1.779 eVThe strontium-87 optical clock transition is an energy change between two quantum states of strontium atoms that can set the timing of an optical atomic clock.
Nearest higher value · EnergyHydrogen atom ground-state binding energy13.61 eVHydrogen atom ground-state binding energy is the energy needed to remove the electron from a hydrogen atom in its lowest energy state.Sources and method
Want to check the number?
The source records and measurement method remain available for inspection.
- NIST — 2022 CODATA fundamental constantsRecommended constants with uncertainties; exact SI definitions are distinguished from measured constants.
There’s always another scale
Follow your curiosity.
EnergyVisible photon2.247 eVA visible photon is a single particle of light within the range detectable by the human eye.Fundamental physicsHydrogen 21 cm hyperfine transition5.873 × 10⁻⁶ eVThis is a change in the energy state of neutral hydrogen atoms that produces or absorbs radio waves, widely used in radio astronomy.Fundamental physicsStrontium-87 optical clock transition1.779 eVThe strontium-87 optical clock transition is an energy change between two quantum states of strontium atoms that can set the timing of an optical atomic clock.EnergyHydrogen atom ground-state binding energy13.61 eVHydrogen atom ground-state binding energy is the energy needed to remove the electron from a hydrogen atom in its lowest energy state.Fundamental physicsCaesium-133 clock transition108.8 psThe caesium-133 clock transition is the specific change in energy state of a caesium-133 atom that defines the duration of one second in the International System of Units.EnergyDeuterium–tritium fusion reaction energy2.82 × 10⁻¹² JDeuterium–tritium fusion reaction energy is the amount of energy released when a deuterium nucleus fuses with a tritium nucleus, producing a neutron and an alpha particle.EnergyOne-gigaelectronvolt cosmic-ray proton1.602 × 10⁻¹⁰ JA one-gigaelectronvolt cosmic-ray proton is a hydrogen nucleus travelling through space with a kinetic energy of 1 GeV.EnergyLarge Hadron Collider proton energy1.1 × 10⁻⁶ JLarge Hadron Collider proton energy is the kinetic energy carried by a single proton accelerated in the LHC.