A) 996 J
B) 831 J
C) 498 J
D) 374 J
Correct Answer: C
Solution :
Since, the volume of cylinder is fixed and helium is a monoatomic gas. The internal energy \[=\mu {{C}_{V}}\Delta T\] \[U=\frac{1}{2}f\mu R\Delta T\] \[\left[ \therefore {{C}_{V}}=\frac{1}{2}f\,R \right]\] \[U=\frac{1}{2}\times 3\times 2\times 8.31\times 20\] = 498.6 J
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