P3H4O1T1O1C3A1T1H4O1D2E1S1
24 points
PHOTOCATHODES is validvalid
PHOTOCATHODE,
PHOTOCATHODE, a cathode that emits electrons when exposed to radiant energy and esp. light
PHOTOCATHODE,
PHOTOCATHODE, a cathode that emits electrons when exposed to radiant energy and esp. light