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

• Correct answer
  A

  $\text{1:2}$
• B

  $\text{3:5}$
• C

  $\text{1:4}$
• D

  $\text{4:9}$

Hence, the correct answer is option: 'A'.