Answer:
λ=589nm
Explanation:
The wavelength of the sodium light can be calculated using the next equation:
[tex] \lambda = \frac{\Lambda D}{L} [/tex]
where Λ: is the distance between the adjacent bright regions, λ: is the wavelength of the sodium light, L: is the distance between slits and screen, and D: is the distance between slits.
[tex] \lambda = \frac{7.32mm \cdot 0.12mm}{1490mm} = 5.89\cdot 10^{-4}mm = 589nm [/tex]
Therefore, the λ of the sodium light is 589 nm.
I hope it helps you!
