The figure shows two point sources of light, A and B, that emit light waves in phase with each other. A is a distance of 3? from point P. B is distant 5? from P. (? is the wavelength.) The phase difference between the waves arriving at P from A and B is
?
?
A. 0 rad.
B. ? rad.
C. 2? rad.
D. 3? rad.
E. 4? rad.
Answer: E
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