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Consider two sources of disturbances, each generating an electromagnetic wave of same frequency
f = 4.3 x 1014 Hz in vacuum. The path difference between the two waves is 3.0 nm. What is the
phase difference between the two waves?
O A. 0.027 rad
O B. 0.067 rad
O C. 0.15 rad
O D. 1.0 rad

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