QJEEM14Ph7ca8: JEE Main 2014 Physics - Class 11 JEEM14Ph7ca8 Solution: One mole of a diatomic ideal gas undergoes a cyclic process A B …

Question

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One mole of a diatomic ideal gas undergoes a cyclic process

A B C

as shown in figure. The process

B C

is adiabatic. The temperatures at

A, B

and

C

are

400

K

,

800

K

and

600

K

respectively. Choose the correct statement : JEE Main 2014 (Offline) Physics - Heat and Thermodynamics Question 369 English

Accepted Answer

In cyclic process, change in total internal energy is zero.

Δ U_{c y c l i c} = 0

Δ U_{B C} = n C_{v} Δ T = 1 \times \frac{5 R}{2} Δ T

where, $C_{v} =$ molar specific heat at constant volume.
For $B C,$ $Δ T = - 200 K$
$∴$ $Δ U_{B C} = - 500 R$

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