One end of a plastic foot ruler is held tightly at the edge of a table and the other end is plucked. Name the vibrations produced in the ruler.

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TextSingle Fixed Pulley and Its Mechanical AdvantageSingle Movable Pulley and Its Mechanical AdvantageCondition for Echo Formation

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TextSingle Fixed Pulley and Its Mechanical AdvantageSingle Movable Pulley and Its Mechanical AdvantageCondition for Echo Formation

Now the ruler is pushed inside partially and plucked again from its free end. State with a reason whether the frequency of vibration increases or decreases.

TextSingle Fixed Pulley and Its Mechanical AdvantageSingle Movable Pulley and Its Mechanical AdvantageCondition for Echo Formation