Spectrum scale
Power-of-ten guide (meters)
$10^{4}\,\mathrm{m}$
$10^{0}\,\mathrm{m}$
$10^{-3}\,\mathrm{m}$
$10^{-6}\,\mathrm{m}$
$10^{-9}\,\mathrm{m}$
$10^{-12}\,\mathrm{m}$
$10^{-14}\,\mathrm{m}$
10 km
1 m
1 mm
1 $\mu\mathrm{m}$
1 nm
1 pm
10 fm
Examples
Detectors
Explore panels
tabs
Convert
Telescopes
Objects
Lines
Enter one quantity; the other two update automatically.
Wavelength (nm)
Frequency (Hz)
Photon energy (eV)
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
units
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.