Question

A tube with both ends closed has same set of natural frequency as

• A. one end closed organ pipe
• B. both end open organ pipe
• C. vibratory string fixed at both ends
• D. vibratory string fixed at one end

Answer 1

Answer: (B)

A tube with both ends closed has same set of natural frequency as both end open organ pipe as in both the cases max wavelength will be $L=\lambda /2$.
In case of both end closed, at the ends nodes will be formed, in the case of both end open, at the ends antinodes will be formed.
And frequency $=$ velocity / wavelength or $\lambda$.