Question

What happened to high-voltage sparks across the detector loop when the emitter plate was illuminated with ultraviolet light from an arc lamp?

Options

• They became positive ions.

• They were enhanced.

• They escaped from the metal surface.

• They absorbed energy from incident radiation.

Answer 1

Hertz observed that high-voltage sparks across the detector loop were enhanced. This occurred when ultraviolet light from an arc lamp illuminated the emitter plate.