A wire of length 2L, is made by joining two wires A and B of same length but different radii r and 2r and made of the same material. It is vibrating at a frequency such that the joint of the two wires forms a node. If the number of antinodes in wire A is p and that in B is q then the ratio p : q is -

(1) 3 : 5 (2) 4 : 9 (3) 1 : 2 (4) 1 : 4