Electromagnetic Spectrum: Light Beyond Visible
Spectrum scale
Examples
Detectors
Explore panels
Enter one quantity; the other two update automatically.
Tip: try $656~\mathrm{nm}$ (H$\alpha$) or $21~\mathrm{cm}$ ($2.1\times 10^8~\mathrm{nm}$).
A few common atomic lines (nm) and IR band centers ($\mu\mathrm{m}$) used in teaching examples.
Model notes
Relationships: $c = \lambda \nu$ and $E = h\nu = \frac{hc}{\lambda}$.
- Internal math uses CGS constants: $c$ in $\mathrm{cm/s}$ and $h$ in $\mathrm{erg\,s}$.
- Readouts are reported in teaching-friendly units (nm, Hz, eV/keV/MeV) with explicit unit labels.