PS Producing Light

This type of light is generated by heating a piece of metal until it glows.

• incandescent

• fluorscent

• neon

• laser

Incandescent light bulbs have these small coils, usually made of tungsten.

In these, when there is an electric current in a filament, its electric resistance makes it hot enough to emit light.

• incandescent light bulb

• fluorescent bulbs

• sodium-vapor light

• tungsten-halogen lights

About 90% of the energy given off by these is thermal energy.

• incandescent light bulbs

• fluorescent bulbs

• coherent lights

• incoherent lights

This type of light is generated by using phosphors to convert ultraviolet radiation to visible light.

• fluorescent

• incandescent

• sodium-vapor

• tungsten-halogen

This is a substance that absorbs ultraviolet radiation and then emits visible light.

• neon light

• optical discs

• phosphor

• filament

These are filled with a gas at low pressure and coated on the inside with phosphors.

• incandescent bulbs

• fluorescent bulbs

• neon lights

• lasers

These are located at each end of a fluorescent light bulb.

• electrode

• filaments

• phosphor

• electric signal

These are given off when the electrodes are connected in a circuit.

 In these, when electrons collide with gas atoms, they emit ultraviolet radiation.

• incandescent lights

• fluorescent lights

• lasers

• sodium-vapor lights