How much (in per cent) has a filament diameter decreased due to evaporation if the maintenance of the previous temperature required an increase of the voltage by 1 0 The amount of heat transferred from the filament into surrounding space is assumed to be proportional to the filament surface area

Question: How much (in per cent) has a filament diameter decreased due to evaporation if the maintenance of the previous temperature required an increase of the

How much (in per cent) has a filament diameter decreased due to evaporation if the maintenance of the previous temperature required an increase of the voltage by η = 1.0%? The amount of heat transferred from the filament into surrounding space is assumed to be proportional to the filament surface area.

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