Joules to Electronvolts Converter

Convert Energy from Joules to Electronvolts with Precision

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Joules to Electronvolts Calculator

Convert energy values from Joules (J) to Electronvolts (eV) with high precision.

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Photon Energy Calculator

Calculate photon energy from wavelength or frequency.

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Understanding Atomic Energy Units

The Electronvolt (eV)

Key concepts:

  • 1 eV = 1.602176634 × 10⁻¹⁹ J
  • Unit of energy in atomic physics
  • Energy gained by electron in 1V
  • Common in particle physics
  • Used in quantum mechanics

Photon Energy

Important relations:

  • E = hf (Planck's equation)
  • E = hc/λ (wavelength form)
  • h = 6.626 × 10⁻³⁴ J·s
  • c = 3 × 10⁸ m/s
  • λf = c (wave equation)

Energy Ranges

Common values:

  • Visible light: 1.6-3.4 eV
  • UV light: 3.4-124 eV
  • X-rays: 124 eV - 124 keV
  • Gamma rays: > 124 keV
  • Chemical bonds: 0.1-10 eV

Applications

Used in:

  • Atomic spectroscopy
  • Particle accelerators
  • Semiconductor physics
  • Nuclear physics
  • Quantum optics

Essential Energy Conversion Formulas

Basic Conversions

1 J = 6.241509074 × 10¹⁸ eV

1 eV = 1.602176634 × 10⁻¹⁹ J

Photon Energy

E = hf = hc/λ

E(eV) = 1240/λ(nm)

Energy Prefixes

1 keV = 1000 eV

1 MeV = 10⁶ eV