Q

A wave produces 40 crests and 40 troughs in 0.3 s. Find its frequency.

RRB Group-D 27/11/2018 (Shift-III) 2018
✓ Answer: C 133.33 Hz
Each crest-trough pair represents one cycle. Thus f = 40/0.3 ≈ 133.33 Hz.
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