Wave Phase Difference from Coherent Sources · CAP 2007 #2
Physics
Problem
The figure shows two point sources (A and B) of coherent mechanical waves of the same wavelength. Source B emits waves that are +π radians out of phase with the waves from source A. Source A is 3λ distant from P and source B is 5λ distant from P (λ is the wavelength).
[Figure: Two point sources A and B with point P, showing distances 3λ and 5λ respectively]
The phase difference between the waves arriving at P from A and B is
(a) 0 rad (b) π/2 rad (c) 2π rad (d) 3π rad (e) 4π rad