| 释义 |
light Electromagnetic energy with a waveform having a frequency above the upper limit of the radio range of 300 GHz and equal or less than the lower limit of the X-ray range of 30 PHz. At the low end of the range is infrared (IR) light, which operates at 30–300 Hz, and at the upper end of the range is extremely high frequency (EHF) radio. See also electromagnetic spectrum, frequency, and Hz. |