I WONDER - What Is A Fluorescent Lightbulb?

The video explains how gas mixtures, typically containing mercury vapor, emit ultraviolet light when excited by an electric current. This ultraviolet light then excites a phosphor coating inside the bulb, producing visible light. These bulbs are more energy-efficient than incandescent bulbs but contain mercury, a toxic element.

What type of gas is primarily used in fluorescent bulbs to emit ultraviolet light?

• Helium gas

• Argon gas

• Mercury vapor

• Neon gas

What happens when ultraviolet light excites the phosphor coating inside a fluorescent bulb?

• It emits sound

• It creates visible light

• It generates heat

• It produces infrared light

How do fluorescent bulbs compare to incandescent bulbs in terms of energy efficiency?

• They are less efficient

• They do not use electricity

• They are more efficient

• They are equally efficient

What is a significant environmental concern associated with fluorescent bulbs?

• They are too expensive

• They are too bright

• They contain a toxic element

• They consume too much energy

Which element in fluorescent bulbs is considered toxic?

• Cadmium

• Mercury

• Lead

• Arsenic