Fluorescence

Fluorescent tubes are partially evacuated glass tubes filled with low-pressure  ___________________vapour

Fluorescent tubes are partially evacuated glass tubes with a ___________________coating on the glass

When an electric current is passed through the vapour, the electrons in ___________________are excited and move to a higher energy Level

• This high energy level state is ___________________and so the electron moves

 back to its original state

• As it de-excites, the electron releases some of that energy in the form of

 

• an _____________ photon

• The UV light emitted from the mercury atoms then excites the electrons in the

 

• ___________________coating

The electrons in the excited phosphor atoms de-excite in _______ steps

The phosphor atoms emit ____________ light photons when they de-excite