The interior of a fluorescent bulb is filled with mercury vapor and its sides ar

Question

The interior of a fluorescent bulb is filled with mercury vapor and its sides are coated with a phosphor. The best explanation for how the bulb glows is... Question 37 options:

a) The electrically excited mercury vapor emits ultraviolet light that the phosphor absorbs and emits as visible light.

b) The mercury vapor heats up enormously and the phosphor filters out some of the incandescent glow.

c) The light produced by the mercury vapor constructively interferes as it reflects from the phosphor coating.

d) The electric current flowing through the mercury stimulates the phosphor to glow by luminescence.

Explanation / Answer

a is correct option.

The working of fluorescent bulb is that.....

An electric current in the gas excites mercury vapor which produces short wave ultrvoilet that then causes a phosphor coating on the inside of lamp to glow.

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