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The figure shows the circular wave fronts emitted by two sources

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The figure shows the circular wave fronts emitted by two sources.

A) Give the distances from points P, Q and R to the point 1 in indicated order as multiples of lambda.

B) Give the distances from points P, Q and R to the point 2 in indicated order as multiples of lambda.

C) Indicate whether the interference at the point P is constructive or destructive.

D) Indicate whether the interference at the point Q is constructive or destructive.

E) Indicate whether the interference at the point R is constructive or destructive.