The electric fields arriving at a point P from three coherent sources are described by E1 = E0 sin ?t, E2 = E0 sin (?t + ?/4) and E3 = E0 sin (?t + ?/2). Assume the resultant field is represented by Ep = ER sin (?t + ?). The amplitude of the resultant wave at P is
A. E0.
B. 1.5E0.
C. 1.7E0.
D. 2.4E0.
E. 2.9E0.
Answer: D
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