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8 September, 20:39

You are holding one end of an elastic cord that is fastened to a wall 3.0 m away. You begin shaking the end of the cord at 3.5 Hz, creating a continuous sinusoidal wave of wavelength 1.0 m. How much time will pass until a standing wave fills the entire length of string?

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  1. 8 September, 22:36
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    1.714 s

    Explanation:

    The equation of a moving wave,

    v = λf ... Equation 1

    Where v = velocity of the wave, λ = wave length of the wave, f = frequancy of the wave,

    Given: λ = 1.0 m, f = 3.5 Hz.

    Substitute into equation 1

    v = 1.0 (3.5)

    v = 3.5 m/s.

    From motion,

    velocity = distance/time.

    v = d/t

    t = d/v ... Equation 2

    Where distance of the elastic chord from the wall, t = time taken to travel to the other end.

    Given: d = 3.0 m, v = 3.5 m/s

    Substitute into equation 2

    t = 3.0/3.5

    t = 0.857 s.

    Note: for the wave to form a standing wave, it has to travel twice.

    Thus,

    Time taken for standing wave to fill the entire length of the string = 2t

    = 2*0.857

    1.714 s
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