A)
Destructive interference,
dx1 = (2n + 1) lambda L/2d ...... (1)
Lambda = v/f
dx1 = (2n + 1) vL/2df
When n = 0,
dx1 = vL/2df = (343 x 52)/(2 x 8.2 x 440) = 2.47 m (Ans)
B)
dx2 = nvL/fd
When n = 1
dx2 = vL/Fd = (343 x 52)/(440 x 8.2) = 4.94 m
dx = dx2 - dx1 = 2.47 m (Ans)
Comment in case any doubt please rate my answer....
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