Physics - Heat & Thermo Question with Solution | TestHub

PhysicsHeat & ThermoDifferent processesMedium2 minPYQ_2020

PhysicsMediumsingle choice

A litre of dry air at STP expands adiabatically to a volume of $3$ litres. If $γ = 1.40,$ the work done by air is: $(3^{1.4} = 4.6555)$ [Take air to be an ideal gas]

Options:

Answer:

Solution:

$P_{1} = 1 a t m, T_{1} = 273 K$
$P_{1} V_{1}^{γ} = P_{2} V_{2}^{γ}$
$P_{2} = P_{1} {[\frac{V_{1}}{V_{2}}]}^{γ}$
$= 1 a t m {(\frac{1}{3})}^{1.4}$
Now work done $= \frac{P_{1} V_{1} - P_{2} V_{2}}{γ - 1} =$ $90.5 J$

Stream:JEESubject:PhysicsTopic:Heat & ThermoSubtopic:Different processes

⏱ 2mℹ️ Source: PYQ_2020

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