Light Sources

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An incandescent light bulb is filled with air.

Halogens are a group of non-metallic elements such as chlorine, fluorine, bromine, and iodine.

Because of the  __________ effect, the filament can operate at a higher temperature than regular filament lamps, which increases the light output

What are the two most common gases used in a gas discharge lamp?

Fluorescence:- the re-radiation persists for a while even after the exciting source, i.e. the radiation, is removed

Fluorescent lamps contain ____________.

A starter is needed in which type of fluorescent lamp?

A High-Pressure Mercury Vapour lamp has an inner tube and an outer tube.

The inner tube of a High-Pressure Mercury Vapour Lamp has ___________ electrodes.

Metal Halide Lamps are more efficient than fluorescent lamps.

In the stroboscopic effect, the flickering occurs because the lights go off twice per cycle.