Given below are two statements: one is labelled as Assertion A and the other is labelled as Reason A.

Assertion A: The filament in an electric bulb does not burn up although its temperature is about 2700°C when it glows.

Reason R: Bulb filament is made of tungsten.

In the light of the above statements, choose the most appropriate answer from the options give below.

Both A and R are correct and R is the correct explanation of A

The correct answer is Option (1) → Both A and R are correct and R is the correct explanation of A

Assertion A: The filament in an electric bulb does not burn up although its temperature is about 2700°C when it glows. This statement is correct. The filament can withstand very high temperatures without melting or burning quickly.

Reason R: Bulb filament is made of tungsten. This statement is also correct. Tungsten has an extremely high melting point.

Does R Explains A? Yes. Since the operating temperature of the bulb filament is around 2700∘C , which is much lower than tungsten’s melting point, the filament can glow white hot without melting or getting destroyed quickly. Thus, the special property of tungsten directly explains why the filament survives at such high temperatures. Although the bulb also contains vacuum or inert gas to prevent oxidation, the main reason the filament can withstand such a high temperature is the use of tungsten itself. Hence, the Reason directly explains the Assertion.