Table 4-1: SOME PROPERTIES OF ELECTROMAGNETIC RADIATION
| Wavelength (nm) | Photon energy (eV)* | Peak of blackbody temperature (K) |
|---|
| Radio | >107 | <10−4 | <0.03 |
| Microwave** | 107 to 4 × 105 | 10−4 to 3 × 10−3 | 0.03 to 30 |
| Infrared | 4 × 105 to 7 × 102 | 3 × 10−3 to 2 | 30 to 4100 |
| Visible | 7 × 102 to 4 × 102 | 2 to 3 | 4100 to 7300 |
| Ultraviolet | 4 × 102 to 101 | 3 to 103 | 7300 to 3 × 106 |
| X-ray | 101 to 10−2 | 103 to 105 | 3 × 106 to 3 × 108 |
| Gamma ray | <10−2 | >105 | >3 × 108 |
| Note: > means greater than; < means less than |
| *1 eV (electron volt) = 1.6 × 10−19 J |
| **Microwaves, listed here separately, are often classified as radio waves or infrared radiation. |