An ideal gas undergoes an expansion from a state with tempe…

Physics Thermodynamics Mix MCQ (Single Correct)

An ideal gas undergoes an expansion from a state with temperature T, and volume V 1 to V 2 through three different polytropic processes A, B and C as shown in the P–V diagram. If | Δ E A |, | Δ E B | and | Δ E C | be the magnitude of changes in internal energy along the three paths respectively -

| Δ E A | < | Δ E B | < | Δ E C | if temperature in every process decreases

| Δ E A | > | Δ E B | > | Δ E C | if temperature in every process decreases

| Δ E A | > | Δ E B | > | Δ E C | if temperature in every process increases

| Δ E B | < | Δ E A | < | Δ E C | if temperature in every process increases

Text Solution

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The correct answer is:

CHECK THE SOLUTION.

(a, c)

If T 1 > T 2

then E 0 > E f

hence (E 0 – E A ) < (E 0 – E B ) < E 0 –E C ⇒ | Δ E A | < | Δ E B | < | Δ E C |

If T 1 < T 2 then E 0 < E f for all the processes

| Δ E A |>| Δ E B | > | Δ E C |

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