AIIMS 2017 Physics Internal Energy MCQ Question
Assume that the nuclear binding energy per nuclear (BA) versus mass number (A) as shown in the figure. Use this plot to choose the correct choice (s) given below
(a) Fusion of two nuclei with the mass number lies in the range of 51. The change in internal energy of the gas during the transition is
20 kJ
12 kJ
-20 kJ
20 J
Correct Answer
Detailed Explanation
The change in internal energy, ΔB, is calculated as the difference between the final and initial states of a system. In this case, if the internal energy decreases from an initial value to a final value, resulting in ΔB = -20 kJ, option C is correct. Options A and D suggest positive changes in internal energy, indicating an increase, while option B suggests a smaller decrease, which does not match the calculated value. Understanding these changes is crucial in thermodynamics, as they reflect energy transfer in physical and chemical processes.
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