MCQ Detailed View

The filament in an electric bulb is the part that produces light when electricity passes through it. This filament is made of Tungsten (W) due to its exceptionally high melting point of 3422°C. This allows it to glow brightly without melting, making it perfect for use in incandescent bulbs.

Other metals such as Copper, Aluminum, and Lead are not suitable for bulb filaments. Copper and Aluminum have lower melting points, so they would melt quickly under the heat produced by an electric current. Lead also melts at low temperatures and cannot withstand the high heat required to produce light.

The filament is usually a thin wire coiled to increase its resistance. When current flows through it, the wire heats up and emits visible light. Tungsten’s strength and durability also contribute to a long-lasting filament.

Additionally, the filament is enclosed in a vacuum or inert gas such as argon. This prevents oxidation and reduces the rate at which the filament evaporates, ensuring the bulb works safely and efficiently.

Understanding why Tungsten is used in electric bulbs is an example of chemistry applied in daily life. It shows how the physical properties of materials, such as melting point and durability, determine their practical applications in technology and engineering.

Using Tungsten ensures safety, efficiency, and longevity of electric bulbs, which is why it remains the standard choice for incandescent light filaments.