Question

In Young?s double slit experimental setup, if the wavelength alone is doubled, the band width $\beta$ becomes

• A. $\frac{\beta}{2}$
• B. $2\beta$
• C. $4\beta$
• D. $\beta$

Answer 1

Answer: (B)

$2\beta$

Answer 2

In Youngs double slit experiment
Band width $\beta=\frac{\lambda D}{2 d}$
$\beta \propto \lambda$
If the wavelength is doubled, then band width $\beta$ become double.