Dear experts, Information: Consider the two-source interference pattern shown ab

Question

Dear experts,

Information: Consider the two-source interference pattern shown above. Source A is on the left and source B is on the right. Solid lines indicate wave crests, and dashed lines indicate wave troughs.

Question: How do the frequencies of the two sources compare, and are the two sources in phase or out of phase with each other? Please select the correct multiple choice answer:

A. fA = fB; out of phase
B. fA = fB; in phase
C. fA > fB; in phase
D. fA < fB; out of phase
E. fA > fB; out of phase
F. fA < fB; in phase

Explanation / Answer

Consider the two-source interference pattern shown above. Source A is on the left and source B is on the right. Solid lines indicate wave crests, and dashed lines indicate wave trough:

B. fA = fB; in phase

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