Problem: Antennas A and B emit coherent radio waves that have wavelength 8.0 m and that are in phase. Point P is on the line connecting the two antennas and is 9.0 m from A and 17.0 m from B. Is the interference at point P for the waves from the two antennas constructive or destructive?(a) destructive(b) constructive 

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Antennas A and B emit coherent radio waves that have wavelength 8.0 m and that are in phase. Point P is on the line connecting the two antennas and is 9.0 m from A and 17.0 m from B. Is the interference at point P for the waves from the two antennas constructive or destructive?

(a) destructive

(b) constructive 

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