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Two sound sources emit sound of wavelength 1.4m in phase. One source is at 4.9m i^...

Two sound sources emit sound of wavelength 1.4m in phase. One source is at 4.9m i^ and the other is at -4.9m hati.

An observer is at r⃗ =6.8mj^, a location of constructive interference, and walks to r⃗ =13.6mi^+9.4mj^.

In this process how many times did the observer encounter a location of destructive interference (in other words a quiet location)?

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At initial position of observer, by symmetry, path difference of sources from observer is zero and it's position of central maximum or constructive interference. At final position,

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