Question

A tuning fork is used to produce resonance in a glass tube. The length of the air column in this tube can be adjusted by a variable piston. At room temperture of ${27}^{o}C$, two successive resonances are produced at $20cm$ and $73cm$ of column length. If the frequency of the tuning fork is $320Hz$, the velocity of sound in air at ${27}^{o}C$ is approximately

• A. $339m/s$
• B. $330m/s$
• C. $350m/s$
• D. $300m/s$

Answer 1

The correct option is A $339m/s$

$V=2f(l_2–l_1)=2\left(320\right)\times (0.73–0.20)=\left(640\right)\times (0.53)=339.2m/s$