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The wave pattern on a stretched string i...

The wave pattern on a stretched string is shown in figure . Interpret what kind of wave this is and find its wavelength

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We have to observe the displacement and potion of different points, then accordigly nature of two wave is decided.
Points on position x=10,20,30,40 never move, always at mean position with respect to
`:. ` Distance between two sucessive nodes =`(lambda)/(2)`
`rArr" " lambda=2xx`(node to node distance )
`" " =2xx(20-10)`
`" " =2xx10=20cm`
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