The transit time (in cycles) for the electrons in the repeller

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The transit time (in cycles) for the electrons in the repeller space of a reflex klystron oscillator for sustaining oscillations is [n is any integer including zero]:

1. 2 (n – 1)
2. 2n – 1
3. n + 1/2
4. n + 3/4

Correct Option: D

NA