গ্যাসের অন্তঃস্থ শক্তির পরিবর্তন কত হবে?  

The answer is -400 J, which indicates a decrease in the internal energy of the gas. In thermodynamics, the change in internal energy can be negative, which typically means that the system has released energy, possibly in the form of heat or work done by the system. Here’s a brief explanation of internal energy change:

    
• Internal Energy: The total energy contained within a system due to the kinetic and potential energies of its molecules.
    
• Significance of Negative Value: A negative change (-400 J) means that the gas has lost energy, which can happen when it expands or cools.

This value helps in understanding the energy dynamics in a thermodynamic process involving the gas.

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