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Question

Which of the statement/s is/are true for a fluorescent lamp?


A

A phosphour coating on the inside part of the lamp to glow by excitation of mercury vapour.

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B

A fluorescent lamp converts heat energy into useful light.

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C

A fluorescent lamp converts electrical energy into useful light

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D

An electric current in the gas excites hydrogen vapour, which produces medium-wave ultraviolet light.

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Solution

The correct options are
A

A phosphour coating on the inside part of the lamp to glow by excitation of mercury vapour.


C

A fluorescent lamp converts electrical energy into useful light


An electric current in the gas excites mercury vapor, which produces short-wave ultraviolet light that causes a phosphour coating on the inside part of the lamp to glow. A fluorescent lamp converts electrical energy into useful light much more efficiently than incandescent lamps.


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