Question 14: Thermodynamics & KTG

Question

One mole of an ideal diatomic gas undergoes
transition from A to B along a path AB as
shown below.

The change in internal energy of the gas
during the transition is

Accepted Answer

According to the figure
The change in internal energy of the gas
$$\begin{aligned}
\Delta U & =\frac{p_2 V_2-p_1 V_1}{\gamma-1} \
p_1 & =2 p a \
p_2 & =5 p a \
V_1 & =4 \mathrm{~m}^3 \
V_2 & =6 \mathrm{~m}^3 \
& =\frac{2 	imes 6-4 	imes 5}{\frac{7}{5}-1} \
& =-20 \mathrm{~kJ}
\end{aligned}$$

Answer

20 kJ

Answer

$$-$$12 kJ

Answer

$$-$$20 kJ

Answer

20 J

Thermodynamics & KTG

One mole of an ideal diatomic gas undergoes transition from A to B along a path AB as shown below. The change in internal energy of the gas during the transition is

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