An organ pipe of length 1.00 m with one end closed is filled with a gas and is found to give the same note as an open pi

[answerhappygod]

An organ pipe of length 1.00 m with one end closed is filled
with a gas and is found to give the same note as an open pipe of
length 1.30 m filled with air when both are resonating at their
fundamental mode of vibration. What is the ratio of the velocity of
sound in the gas to the velocity of sound in air
(i.e. vgas/vair)?
(a) 0.65 (b) 0.77 (c) 1.00 (d) 1.30 (e) 1.54