Two in Phase Coherent Sources Emitting Harmonic Waves of Wavelength

question 19

Multiple Choice

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

• A)λ/2
• B)λ
• C)zero
• D)2λ
• E)λ/4

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