First slide

Change in internal energy

Question

A diatomic gas contained in a vessel is subjected to a thermodynamic process such that its pressure changes with volume as shown in Fig.
Change of internal energy during the process is:

Difficult

A

4.5 X 10⁵ J
B

3.2 X 10⁵ J
C

7.6 x 10⁵ J
D

5.7 x 10⁵ J

Solution

$∆ U = {nC}_{v} ∆ T = n (\frac{5}{2} R) (T_{2} - T_{1}) = \frac{5}{2} (P_{2} V_{2} - P_{1} V_{1}) = 4.5 \times 10^{5} J$

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