A composite wire of length 2L is made by...

A composite wire of length 2L is made by joining two different wires A and B having the same length, made of the same material but of different radii r and 2r respectively . The composite wire is vibrating at such a frequency, that the junction of the two wires form a node. If the number of antinodes in the wire A is p and that in the wire B is q, then the ratio `p : q ` is

`1:2`

`3:5`

`1:4`

`4:9`

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