In a cylinder filled up with ideal gas and closed from both ends there is a piston of mass m and cross-sectional area S (Fig. 4.21). In equilibrium the piston divides the cylinder into two equal parts, each with volume Vo. The gas pressure is Pc. The piston was slightly displaced from the equilibrium position and released. Find its oscillation frequency, assuming the processes in the gas to be adiabatic and the friction negligible.

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m S