A Planar Cross Section Through Two Spherical Waves Emanating from the Sources

question 27

Multiple Choice

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) π/2.
• C) π.
• D) 3π/2.
• E) 2π.

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