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11.Thermodynamics
medium
An ideal monoatomic gas is taken through the thermodynamic states $A \to B \to C \to D$ via the paths shown in the figure. If $U_A, U_B, U_C$ and $U_D$ represent the internal energy of the gas in state $A, B\, C$ and $D$ respectively, then which of the following is not true?
A
$U_A -U_D = 0$
B
$U_B -U_C = 0$
C
$U_C -U_D > 0$
D
$U_B -U_A < 0$
Solution
$A \rightarrow B$ Isobaric process $B-C$ Isothermal Process
$P=$ const
$\mathrm{U}_{\mathrm{C}}-\mathrm{U}_{\mathrm{B}}=0$
$\mathrm{T} \uparrow$
$\mathrm{U}_{\mathrm{B}}-\mathrm{U}_{\mathrm{A}}>0$
$\mathrm{C} \rightarrow \mathrm{D}$
$\mathrm{U}_{\mathrm{C}}-\mathrm{U}_{\mathrm{P}}>0$
Standard 11
Physics
