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When a 500-W electric bulb and a 500-W heater operate at their rated voltages, the filament of the bulb reaches a much higher temperature than the filament of the heater. The most important reason for this is that 

(a) their resistances are not equal 

(b) they are made of different materials 

(c) their dimensions are very different 

(d) they radiate different powers at different temperatures

1 Answer

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Correct Answer is: (c) their dimensions are very different 

As the bulb and the heater have the same power rating, they must radiate the same power. The power radiated depends on the surface area and the temperature of the filament. The filament of the heater is much longer and thicker than that of the bulb, and hence has greater surface area. It can therefore radiate the same power as the bulb, at a temperature lower than that of the bulb.

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