Consider the following four cylindrical tubes $(P, Q, R, S)$ all of equal radii. The tubes $Q$ and $R$ are of length $l$. The tubes $P$ and $S$ are of length 1.5 . If the fundamental frequencies are $\nu_P, \nu_Q, \nu_R$ and $\nu_S$, respectively, then the correct option is

• A

  $\nu_R \gt \nu_S \gt \nu_P \gt \nu_Q$
• Correct answer
  B

  $\nu_R \gt \nu_S \gt \nu_Q \gt \nu_P$
• C

  $\nu_S \gt \nu_R \gt \nu_Q \gt \nu_P$
• D

  $\nu_R \gt \nu_P \gt \nu_S \gt \nu_Q$

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