Two point sources oscillating in phase- find smallest corresponding path length diff

[Sora730]

Homework Statement

Two point sources S₁ and S₂, oscillating in phase send waves into the air at the same wavelength 1.98m. Given that there is a nodal point where the two waves overlap, find the smallest correspondign path length difference.

The only given i can obtain form this is the wavelength 1.98
i am unable to find what else is given


2. Homework Equations [/b

|PS₂-PS₁| = n(wavelength)
n = nodal line

The Attempt at a Solution

I was unable to attempt at the solution due any unknown given sorry..
if i have the givens then i can use the equation i believe and obtain the right answer

 

[nilesh_pat]

The given in the problem is the wavelength, 1.98 m. You can then use the equation |PS2-PS1| = n(wavelength), where n is a nodal line, to calculate the smallest path length difference. So, the smallest path length difference is equal to n*1.98 m, where n is the number of nodal lines.