Answer | Crossword Clue |
---|---|
photocathode | a cathode that emits electrons when exposed to radiant energy and esp light |
photocathodes | PHOTOCATHODE, a cathode that emits electrons when exposed to radiant energy and esp light |
led | light-emitting diode: a semiconductor diode that emits light when conducting current and is used in electronic equipment, esp. for displaying readings on digital watches, calculators, etc. |