Part A. Give the distances from points P, Q and R to the point 1 in indicated order as multiples of λλ.Part B. Give the distances from points P, Q and R to the point 2 in indicated order as multiples of λλ.Part C. Give the propagation difference at points P, Q and R in indicated order as multiples of λλ.Part DPart E. Indicate whether the interference at the point Q is constructive or destructive.Part F. Indicate whether the interference at the point R is constructive or destructive.