JEE PYQ: Thermodynamics Question 39
Question 39 - 2019 (12 Jan Shift 1)
The combination of plots which does not represent isothermal expansion of an ideal gas is:
(A) P vs $1/V_m$ — straight line through origin (B) P vs $V_m$ — hyperbola (C) $PV_m$ vs P — horizontal line (D) U vs $V_m$ — curve increasing
(1) (B) and (D)
(2) (A) and (C)
(3) (B) and (C)
(4) (A) and (D)
Show Answer
Answer: (1)
Solution
Isothermal expansion: $PV_m = K$ (graph C is correct). $P = \dfrac{K}{V_m}$ (graph A is correct, graph B should be a rectangular hyperbola - also correct). Therefore (B) and (D) are not correct representations.
BETA
