An empty pressure cooker of volume 10 litres contains air at atmospheric pressure 10⁵ Pa and temperature of 27°C. It contains a whistle which has area of 0.1 cm² and weight of 100 g. What should be the temperature of air inside so that the whistle is just lifted up?

Question

G1 Physics · Accepted Answer

Use PV=nRT, U=(f/2)nRT, γ=1+2/f and vᵣₘₛ=√(3RT/M). At the same temperature, average translational kinetic energy depends only on T. Substituting the given values gives 327.