PhysicsA wave of frequency 100Hz is sent along a string towards a fixed end. When this wave travels back then after reflection, a node is formed at a minimum distance of 10 cm from the fixed end of the string. The speed of the incident wave is

A wave of frequency 100Hz is sent along a string towards a fixed end. When this wave travels back then after reflection, a node is formed at a minimum distance of 10 cm from the fixed end of the string. The speed of the incident wave is

  1. A

    40 m/s

  2. B

    20 m/s

  3. C

    10 m/s

  4. D

    5 m/s

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    Solution:

    n = 100 Hz  ; Distance between two successive nodes =10cm
    λ2= 10cm ⇒λ=20cm v=nλ=100 x 20 x 10-2m=20m/s

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