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The brightness of an incandescent light ...

The brightness of an incandescent light bulb is con- trolled by a regulator. The regulator is a variable resistor connected in series with the bulb. What happens to the colour of the light given off by the bulb as 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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The correct Answer is:
It become reddish. Average photon enrgy decreases.
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