Question

What happened at the illuminated plate in Lenard's experiment?

Options

• The plate gradually lost its negative charge through a gold-leaf electroscope

• Electrons were emitted from the illuminated plate

• The plate stopped all current while ultraviolet light fell on it

• Electrons were emitted from the collector plate when light was removed

Answer 1

The illuminated emitter plate released electrons when ultraviolet light fell on it. These emitted electrons are photoelectrons.