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In Young's experiment, the third bright ...

In Young's experiment, the third bright band for the wavelength of light source A having wavelength `6000Å` coincides with the fourth bright band for source B in the same arrangement .Wavelength of light emitted by source B is

A

`6289Å`

B

`4500Å`

C

`2250Å`

D

`6000Å`

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