Wavelength to Energy Calculator

To calculate a photon's energy from its wavelength: Multiply Planck's constant, 6.6261 × 10⁻³⁴ J⋅s by the speed of light, 299,792,458 m/s. Divide this resulting number by your wavelength in meters. The result is the photon's energy in joules.

To find the energy in joules given the wavelength of a photon: Use Planck's equation E = h × c / λ and substitute the values of the wavelength (λ), Planck's constant in joules (h = 6.6261 × 10⁻³⁴ J⋅s), and speed of light (c = 299792458 m/s). With these units, you'll get an energy result in joules (J). That's it!

In order to convert a wavelength to energy in electronvolts (eV): Utilize Planck's energy equation E = h × c / λ. Substitute the values of the wavelength (λ), Planck's constant (h = 6.6261 × 10⁻³⁴ J⋅s), and speed of light (c = 299792458 m/s). You'll get a result in joules (J). To go from joules (J) to electronvolts (eV), use the conversion factor 1 eV = 1.602176565 × 10⁻¹⁹ J. Finally, to express your result in electronvolts, divide the energy in joules by the conversion factor: E [J] / 1.602176565 e⁻¹⁹ J/eV = E [eV]

To calculate the energy of a photon of wavelength 3.5 μm: Employ Planck's energy equation, E = h × c / λ. Use the values of the wavelength λ = 3.5 μm, Planck's constant h = 6.6261 × 10⁻³⁴ J⋅s and speed of light c = 299792458 m/s. Substitute into Planck's equation, E = (6.6261 × 10⁻³⁴ J⋅s) × (299792458 m/s) / 3.5 μm. After performing the required operations, you'll get the energy value E = 354.242 meV.

The energy of a 100 nm photon is 12.39847 eV or 1.99 × 10⁻¹⁸ J. To get this result: Employ Planck's equation: E = h × c / λ where λ = 100 nm is the wavelength, h = 6.6261 × 10⁻³⁴ J⋅s Planck's constant and c = 299792458 m/s the speed of light. Replace, E = (6.6261 × 10⁻³⁴ J⋅s) × (299792458 m/s) / 100 nm = 1.986454 × 10⁻¹⁸ J. To express the result in electronvolts, apply the conversion factor 1 eV = 1.602176565 × 10⁻¹⁹ J. Therefore: E = 1.986454 × 10⁻¹⁸ J / (1.602176565 × 10⁻¹⁹ J/eV) = 12.39847 eV