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

question 30

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. S₁ and S₂ are in phase. 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 waves shown arriving at P₁ both arrive with amplitude A, the resultant amplitude at point P₁ is

• A) 0.
• B) .
• C) A.
• D) .
• E) 2A.

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