Calculator Inputs
Plotly Graph
This graph compares wavelength, frequency, photon energy, and wavenumber on normalized scales for quick trend inspection.
Example Data Table
| Sample | Wavelength | Frequency | Photon Energy | Band |
|---|---|---|---|---|
| Red light | 700 nm | 428.275 THz | 1.771 eV | Visible |
| Green light | 550 nm | 545.077 THz | 2.254 eV | Visible |
| Ultraviolet | 250 nm | 1199.170 THz | 4.959 eV | Ultraviolet |
| Infrared | 10 µm | 29.979 THz | 0.124 eV | Infrared |
Formula Used
Wave speed relation: v = f × λ
Vacuum form: c = f × λ
Inside a medium: v = c / n, so f = c / (n × λ)
Period relation: T = 1 / f
Photon energy: E = h × f
Wavenumber: ṽ = 1 / λ
Here, c is the speed of light, h is Planck’s constant, n is refractive index, f is frequency, λ is wavelength, and T is period.
How to Use This Calculator
- Select the conversion mode that matches your known input.
- Enter the value in the relevant field and choose its unit.
- Set refractive index to 1 for vacuum or air approximation.
- Choose the decimal precision you want in the output.
- Click Convert Now to generate results above the form.
- Review the graph, compare the example table, and export CSV or PDF if needed.
FAQs
1. What does this converter calculate?
It converts between wavelength, frequency, period, and photon energy. It also reports wavenumber, spectral band, and wave speed in the chosen medium.
2. Why does refractive index matter?
Refractive index changes wave speed in a medium. Frequency stays fixed at boundaries, but wavelength changes because the propagation speed changes.
3. Does this work for vacuum and materials?
Yes. Use refractive index 1 for vacuum. Enter a higher value for glass, water, or another medium to estimate wavelength changes there.
4. What units are supported?
The calculator supports common wavelength, frequency, period, and energy units. This helps compare optical, infrared, radio, and high-energy ranges easily.
5. What is photon energy used for?
Photon energy is useful in spectroscopy, semiconductor analysis, laser work, and photoelectric calculations. Higher frequencies produce higher photon energies.
6. What is wavenumber?
Wavenumber is the reciprocal of wavelength. It is commonly used in spectroscopy, especially when discussing infrared absorption lines and molecular vibrations.
7. Why is the visible band identified automatically?
The tool checks the wavelength range and labels a likely spectral region. This helps users quickly understand whether the result is visible, infrared, ultraviolet, or beyond.
8. Can I export the results?
Yes. Use the CSV button for spreadsheet work and the PDF button for a printable summary. Both are available after calculation.