Also found in: Medical.
Hallwachs effect[′häl‚väks i‚fekt]
The discharge of a negatively charged metal plate caused by photoemission when the plate is exposed to ultraviolet light.
The ability of ultraviolet radiation to discharge a negatively charged body in a vacuum.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.