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
Correct Answer:

Verified
Correct Answer:
Verified
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