Tube A has both ends open while tube B has one end closed, otherwise they are identical. The ratio of fundamental frequency of tube $A$ and $B$ is

• A

  1 : 2
• B

  1 : 4
• Correct answer
  C

  2 : 1
• D

  4 : 1

Solution

$\frac{\lambda_{\mathrm{A}}}{\lambda_{\mathrm{B}}}=\frac{1}{2} \Rightarrow \frac{\mathrm{n}_{\mathrm{A}}}{\mathrm{n}_{\mathrm{B}}}=\frac{2}{1}$

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