RRB Group D 1-Dec-2013 Shift 1 Solved Paper

In physics, frequency is defined as the number of waves that pass a fixed point in a unit time; also, the number of cycles or vibrations undergone during one unit of time by a body in periodic motion. A body in periodic motion is said to have undergone one cycle or one vibration after passing through a series of events or positions and returning to its original state. It is expressed in metres per second