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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

(a)`6289Å`

B

(b)`4500Å`

C

(c)`2250Å`

D

(d)`6000Å`

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