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A wave frequency 100 Hz travels along a ...

A wave frequency `100 Hz` travels along a string towards its fixed end . When this wave travels back after reflection , a node is formed at a distance of `10 cm `from the fixed end . The speed of the wave (incident and reflected) is

A

`20 m//s`

B

`40 m//s`

C

`5 m//s`

D

`10 m//s`

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