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.

---

Definitions:

Rooting and Sucking Reflexes

Innate reflexes crucial for infant survival, enabling them to find and draw milk from the breast or bottle nipple.

Visually Guided Reaching

The ability to reach for objects guided by sight, integrating visual perception and motor coordination, often studied in infants and children.

Maturational Changes

Changes that occur as part of the natural aging process, including physical, cognitive, and emotional development.

Reinforcement

In behavioral psychology, a consequence applied that strengthens an organism's future behavior whenever that behavior is preceded by a specific antecedent stimulus.