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## Homework Statement

two in phase sources of waves are separated by a distance of 4.00m these sources produce identical waves that have a wave length of 5.00 m. on the line between them there are two places at which the same type of interference occurs. a) is it constructive or destructive interference and b) where are the places located

## Homework Equations

l2-l1= m lambda (wavelength)

l2-l1= (m+1/2) lambda

## The Attempt at a Solution

l2-l1= 4 meters

lambda = 5 meters

m= 0.80 meters

I'm so lost.