The melting point of filament of bulb is very high.
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The melting point of filament of a bulb is very high because the bulb begins to glow only when the filament is heated to a high temperature,and it becomes incandescent (bright) without melting.This happens only when the material of the filament has a high melting point.Hence, the material used in the filament of an electric bulb must have a high melting point. For example Tungsten
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