1.

In Fig.A and B are identical radiators of waves that are in phase and of the same wavelength lambda.The radiators are rotated by distance in lambda, d = 3.00 lambda.The greatest distance from A, along the x - axis, for which fully destructive interference occurs is : .

Answer»

`8.75 LAMBDA`
`2.5 lambda`
`4.5 lambda`
`11.25 lambda`

SOLUTION :`sqrt(X^(2) + d^(2)) - x = (lambda)/(2)`
SQUARING, we get
`x^(2) + d^(2) = (x + (lambda)/(2))^(2)`
Now `d = 3 lambda`
Solving, `x = 8.875 lambda`.


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