Question

Two light sources emit waves of wavelength = 3 m which are in phase and the two waves from these
sources meet at a distant point. Wave 1 travels 6 m to reach that point, and wave 2 travels 7 m
when the waves meet, they are:
A. Out of phase, but not by 180'
B. In phase
C. Out of phase by 180°
D. None of these​

Answer 1

Answer:

Two light sources emit waves of λ = 1 m which are in phase. The two waves from these sources meet at a distant point. Wave 1 traveled 2 m.