Question

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]

(1) 90.5 J 

(2) 48 J 

(3) 60.7 J 

(4) 100.8 J

Answer 1

Answer is (1) 90.5 J

Closest answer is 90.5 J

Answer 2

Answer is (1) 90.5 J

= 88.90