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PhysicsHeat & ThermoThermodynamics Laws & Specific Heats of GasesMedium2 minQB

PhysicsMediummultiple choice

Dry air at $2 7^{\circ}$ C and $1 0^{5}$ Pa expands to twice its initial volume, either slowly or suddenly ( $γ = 1.4$ ). Which statements are correct?

Options:(select one or more)

Answer:

A, B, C

Solution:

Slow means isothermal: $T = 300$ K, $P = 5.0 \times 1 0^{4}$ Pa. Sudden means adiabatic: $P = 1 0^{5} \times 2^{- 1.4} = 3.79 \times 1 0^{4}$ Pa and $T = 300 \times 2^{- 0.4} = 227.4$ K. Option D gives the adiabatic temperature for the slow case and is wrong.

Subject:PhysicsTopic:Heat & ThermoSubtopic:Thermodynamics Laws & Specific Heats of Gases

⏱ 2mℹ️ Source: QB

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