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Two in Phase Coherent Sources Emitting Harmonic Waves of Wavelength

Question 61

Multiple Choice

Two in phase coherent sources emitting harmonic waves of wavelength λ are separated by a distance d. What is the minimum non-zero value of d for which constructive interference occurs everywhere along the line that passes through the locations of the two sources?


A) λ/4
B) λ
C) 2λ
D) λ/2
E) 4λ

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