In Young's double slit experimental set up, if the wavelength alone is doubled, the band width `beta` becomes

Options

A. `(beta)/(2)`
B. `2beta`
C. `3beta`
D. `beta`

Answer

B

Explanation

In Young.s double slit experiment
Band width `beta=(lambdaD)/(2d)`
`betaproplambda`
If the wavelength is doubled, then band width `beta` become double.