Intensity at point in YDSE with phase difference φ between two waves of equal amplitude:
AI_max
BI × sin φ
CI = 4 I₀ cos²(φ/2)
DI_max + I_min
Answer & Solution
Correct answer: C. I = 4 I₀ cos²(φ/2)
With two equal-amplitude waves: I = 4 I₀ cos²(φ/2). At φ = 0 (constructive): I = 4 I₀. At φ = π (destructive): I = 0. Time-averaged intensity over the pattern is 2 I₀ (energy conservation).
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