Question

A thermodynamic system goes from states (i) P, V to 2P, V  (ii) P, V to P, 2V. The work done in the two cases is ______.

विकल्प

• zero, zero

• zero, PV

• PV, zero

• PV, PV

Answer 1

A thermodynamic system goes from states (i) P, V to 2P, V  (ii) P, V to P, 2V. The work done in the two cases is zero, PV.

Explanation:

Work done = area under curve = P ∙ ΔV

(1) (P, V) to (2P, V) here volume is constant

∴ W = P ∙ ΔV = P × 0 = 0

(2) (P, V) to (P, 2V) hence

W = P ^2V∫_V dv = P(2V – V) = PV