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What is the origin of dark spots on the inner glass walls of an old tungsten lightbulb? What is the purpose of filling these light-bulbs with argon gas?
Step 1
Over time, the filament gets heated and evaporates, leaving a dark deposit on the inner glass wall of the bulb. This process is known as blackening or dark spot despot. This can be represented as: \[ \text{Tungsten filament} Show more…
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