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← ScienceWhich outcome causes the Gunn diode to generate microwaves?
A)Negative differential resistance effect✓
B)Positive temperature coefficient increase
C)Avalanche breakdown carrier saturation
D)Piezoelectric crystal deformation occurs
💡 Explanation
The Gunn diode needs voltage above threshold. The Negative differential resistance effect causes increased voltage leading to decreased current because increased electric field reduces central valley electron mobility, therefore microwave emission rather than other effects results.
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