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

question 5

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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