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## Homework Statement

Two sources 6.0 cm apart, operating in phase, produce water waves. A student selects a point on the first nodal line and measures from it 30.0cm to a point midway between the sources and 5.0cm (on the perpendicular) to the right bisector.

a) what is the wavelength

## Homework Equations

PS1 - PS2 = (n-1/2)lambda

lambda = xnd/L(n-1/2)

## The Attempt at a Solution

I have tried to use both of these equations, & I still can't get the answer I don't understand.. the answer is 2.0cm and the answers I've been getting are 11.7cm, 60cm, 20cm... I don't understand