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## Homework Statement

A student performing Young's experiment with a single-colour source finds the

distance between the first and the seventh nodal lines to be 6.0 cm. The screen

is located 3.0 m from the two slits. The slit separation is 2.2 x 10^2 nanometres. Calculate

the wavelength of the light.

## Homework Equations

x/L = wavelength/ d

## The Attempt at a Solution

I found a solution online and they made the distance 2.2 x 10^-4 metres instead of 2.2 x 10^-7 if you do the conversion. I think they multiplied by something but i don't know why they would need to.