The resistances of a carbon filament lamp and | vedclass

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Question

(B) Tungsten is a metal (conductor). For metals,the resistance increases with an increase in temperature because the collision frequency of electrons

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Resistance of the tungsten filament lamp will increase,but that of carbon will diminish when hot.

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(B) Tungsten is a metal (conductor). For metals,the resistance increases with an increase in temperature because the collision frequency of electrons increases.Carbon is a non-metal (semiconductor). For semiconductors,the resistance decreases with an increase in temperature because more charge carriers are released as the temperature rises.Therefore,when hot,the resistance of the tungsten filament increases,and the resistance of the carbon filament decreases.

The resistances of a carbon filament lamp and a tungsten filament lamp are measured individually when the lamps are lit and compared with their respective resistances when cold. Which one of the following statements will be true?

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