During an adiabatic compression of 2 moles of gas, 100 J of work is done ON the gas. Find the change in its internal energy (J).
Physics · Mixed Chapter
JEE Main Practice

Question

During an adiabatic compression of 2 moles of gas, 100 J of work is done ON the gas. Find the change in its internal energy (J).

G1 Physics · Accepted Answer

Step 1: Apply the first law ΔU = Q − Wᵦᵧ, where Wᵦᵧ is work done by the gas. Step 2: Adiabatic process gives Q = 0. Compression work on gas = +100 J, hence Wᵦᵧ = −100 J. Step 3: ΔU = 0 − (−100) = +100 J.