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The surface of the electric bulb with a ...

The surface of the electric bulb with a tungsten filament becomes greyish black after being used for a long period of time. Explain the reason.

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**Step-by-Step Solution:** 1. **Understanding the Material**: The filament of the electric bulb is made of tungsten. Tungsten is known for its high melting point and is commonly used in light bulbs. **Hint**: Remember that the material of the filament plays a crucial role in its behavior when heated. 2. **Sublimation of Tungsten**: Tungsten is a sublimable metal, meaning it can transition directly from a solid to a gas (vapor) without becoming a liquid first. This process is known as sublimation. ...
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