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2015-12-07T11:48:32+05:30

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Certified answers contain reliable, trustworthy information vouched for by a hand-picked team of experts. Brainly has millions of high quality answers, all of them carefully moderated by our most trusted community members, but certified answers are the finest of the finest.
Thermionic emission is the emission of free electrons from a metal surface when heat (or thermal) energy is imparted to it.
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2015-12-07T14:29:00+05:30

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The emission of free electrons from a metal surface when heat energy is supplied to it, is known as thermionic emission.
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