A fluorescent lamp consists of a glass tube filled with a mixture of argon and mercury vapour.
Metal electrodes at each end are coated with an alkaline earth oxide that gives off electrons easily.
When current flows through the gas between the electrodes, the gas is ionized and emits ultraviolet radiation.
A fluorescent lamp generates light from collisions in a hot gas (‘plasma’) of free accelerated electrons with atoms– typically mercury – in which electrons are bumped up to higher energy levels and then fall back while emitting at two UV emission lines (254 nm and 185 nm).
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