A litre of dry air at STP expands adiabatically to a volume of 3 litres. If γ = 1.40 , the work done by…

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: 31.4=4.6555 [Take air to be an ideal gas]
  1. 60.7J
  2. 90.5J
  3. 100.8J
  4. 48J

Solution

P1=1atm,T1=273K
P1V1γ=P2V2γ
P2=P1V1V2γ
=1atm131.4
Now work done =P1V1-P2V2γ-1=90.5 J

Asked in: JEE Main 2020 (07 Jan Shift 1)

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