F: Electric Light Source

Question 1

(invented by Thomas Alva Adison)
Employs the principle of converting electrical energy into heat
at aa temperature that causes the filament to be incandescent
(red or white hot).

Answer 1

Incandescent Light

Question 2

(invented by Audre
Claude, also the inventor of neon lamp)
Contains mercury vapor, an electric arc is
produced between the opposing
electrodes generating some visible light.

Answer 2

Fluorescent Light

Question 3

Produces high intensity light within an arc tube contained in an
outer bulb. The metallic gas within the arc tube may be
mercury, sodium or a combination of other metallic vapors.

Answer 3

High- Intensity Discharge (HD) Lamp