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.
• B. A fluorescent lamp converts heat energy into useful light.
• C. A fluorescent lamp converts electrical energy into useful light
• D. An electric current in the gas excites hydrogen vapour, which produces medium-wave ultraviolet light.

Answer 1

Answer: (A), (C)

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.