Which consequence results when exceeding the Fowler-Nordheim limit in a vacuum tube?

💡 Explanation

Exceeding the Fowler-Nordheim limit induces cathode material lattice strain because field emission dramatically increases, inducing high current densities that lead to significant ion bombardment and lattice defects. Therefore, strain weakens the cathode microstructure, rather than electron emission, under conditions beyond the field emission limit.

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