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The brightness of an incandescent light bulb is controlled by a regulator. The regulator is a variable resistor connected in series with the bulb. The resistance of the regulator is increased What happens to the average energy of photons given out by the bulb? Does it increase?

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Wavelength of the radiation increases.

Temperature of the bulb decreases

Average energy of the photon decreases

Temperature of the bulb increases.

answer is A, B, C.

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Detailed Solution

The heat dissipated in the filament will decrease and the temperature of the bulb will fall. More light of longer wavelength will be emitted (Wien’s law). A photon of longer wavelength has lesser energy.

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