Number of Nodal Lines in Two-Point Interference Pattern

[caramel22]

Homework Statement

In a two - point in phase inteference pattern, what will happen to the number of nodal lines if the wavelength of the two sources increases? Justify your answer

Homework Equations

Not too sure if an equation is needed to answer this question

The Attempt at a Solution

I said they would stay the same but its wrong.

 

[fordan]

as the wavelength increases there will be more more nodal lines as the frequency will also increase. with faster wavelenghts the frequency will increase which means the waves will be shorter which will allow for more destructive interference which are nodal lines.