Table 4.

Radiation Classes and Approximate Photon Energies

Type	Frequency (Hz)	Photon energy (J)
γ-rays	3 × 1020	1.9 × 10−13
X-rays	3 × 1016	1.9 × 10−14
Ultraviolet	1 × 1015	6.4 × 10−19
Visible light	6 × 1014	4.0 × 10−19
Infrared light	3 × 1012	2.0 × 10−22
Microwave	2 × 109	6.0 × 10−25
High frequency (HF)	1 × 106	6.4 × 10−28