Which outcome occurs when an electron's energy surpasses the work function of a metal surface in a vacuum tube?

💡 Explanation

Thermionic emission causes electrons to be ejected from the metal surface because the increased thermal energy allows the electrons to overcome the surface potential barrier; therefore, electrons are emitted from the metal, rather than being bound by it under thermionic emission.

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• Which outcome results when coating aircraft wings with riblets nears laminar breakdown?