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A rough surface has more surface area which allows more heat to be transferred.

Q: Why are rough surfaces good emitter of heat?

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A rough surface has more surface area which allows more heat to be transferred.

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Like a LED flashlight, the electricity is passing the emitter, turned into light.

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There is a lens, cup, LED emitter or lamp, button tube, tail, spring, battery, and switch.

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Because it will appear larger, and it will thus (and also because its closer) appear brighter. Remember that the intensity of light perceived is proportional to the surface area of the emitter, and inversely proportional to the square of the distance to the emitter.

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With a common emitter amplifier it's the emitter that is usually grounded.

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