The radiation of an electric room heater is most effective when it is :

uncleaned

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polished to shine

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painted green

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painted black

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Solution

The correct option is B polished to shine
Highly polished heater takes a longer time to cool down than one of the same size with a rough dark surface.

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Similar questions

For the effective radiation of heat by an electric room heater, which of the following needs to be done?

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