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Distance between trough and crest of wav...

Distance between trough and crest of waves is 1.5m while distance between two trough is 5m. Which of following wavelength is possible

A

`1,2,3........`

B

`1/1,1/3,1/5,......`

C

`1,3,5......`

D

`1/2,1/4,1/6,......`

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