In half-wave rectification, what is the output frequency if the Input frequency is 50 Hz. What is the output frequency of a full-wave rectifier for the same input frequency.

During a cycle, half wave rectifier conducts once and full wave rectifier conducts twice, hence the output frequency for the half-wave rectifier will be same i.e. 50 Hz, whereas the output frequency for the full wave rectifier will be double, i.e. 100 Hz.

Output frequency for full wave rectifier = 100Hz, for half-wave rectifier it’s 50 Hz.

(Actually, this is application of p-n junction diode)