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## Homework Statement

The diagram attached shows two coherent sources P and Q which produce waves of the same phase with wavelength , labda . If the two waves meet at the point R , the phase difference between waves at R is ??

## Homework Equations

y=a sin (omega t + kx)

## The Attempt at a Solution

i have problems obtaining the equation for wave p and q respectively , i know i have to find the superposition of the wave ?