A planar cross section through two spherical waves emanating from the sources S1 and S2 in the plane is shown in the figure. The black circles are one and two wavelengths from their respective sources. The lighter circles are one-half and one-and-a-half wavelengths distant from their respective sources. If the phase at S1 and S2 is zero at this instant, and the waves shown arriving at P2 both arrive with amplitude A, the difference in phase angle at point P2 (in radians) is
?
?
A. 0.
B. ?/2.
C. ?.
D. 3?/2.
E. 2?.
Answer: C
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