Question

The bulb are usually filled with few gases. Nane those gases . Also discuss the cause for the same.

Answer 1

1:Incandescent lamps-Nitrogen(vaporisation can be reduced) 2:Fluorescent lamps-thorium oxide(They are used as traps for fipes and in banks for detecting fake notes and fake documents) 3:Compact fluorescent lamps(CFL):Mercury vapour(Detrimental to environment) 4:Arc lamps-Carbon rods