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    Physics
    Grade-9
    Easy

    Question

    Radian is a unit of:

    1. Time period
    2. Angular displacement
    3. Amplitude
    4. Frequency

    Hint:

    One radian is the angle at which that ratio equals one (see the first diagram). 180 degrees = PI radians, 360 degrees = 2*PI radians, 90 degrees = PI/2 radians, etc.

    The correct answer is: Frequency

      A radian is a unit of measurement for angles defined by the ratio of the length of the arc of a circle to the radius of that circle.

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