The ripple frequency of the Full-wave rectifier will be

• A half-wave rectifier conducts when the alternating current is positive, which happens during 180° of the A.C cycle, and blocks current during the other 180 degrees 
• A full-wave rectifier conducts during both 180° periods of an A.C cycle; So you can see, it conducts current for twice the amount of time
• The full-wave rectifier has twice the efficiency of a half-wave rectifier is, that it utilizes both half-cycles of the input
• In a half-wave rectifier, the time interval between two consecutive peaks of the output voltage waveform is the time period of the input supply waveform.
• In a full-wave rectifier, the time interval between two consecutive peaks of the output voltage waveform is half of the time period of the input supply waveform.

Notes:

• In a full-wave rectifier, during each half-cycle, the current flows through two diodes instead of just one.
• ∴ The amplitude of the output voltage is two voltage drops less than the input VMAX amplitude and the ripple frequency is now twice the supply frequency.
• The fundamental frequency of the ripple voltage is double that of the supply frequency whereas for the half-wave rectifier it is equal to the AC supply frequency.