If a gas expands at a constant pressure by providing heat:a)The temperature increasesb)The kinetic energy of the gaseous molecules remains samec)The kinetic energy of gaseous molecules decreasesd)The number of molecules of the gas decreaseCorrect answer is option 'C'. Can you explain this answer?

Question

Answer

Explanation:

When a gas expands, it means that the volume of the gas increases. If the pressure remains constant during the expansion, the gas absorbs heat and gains energy. This leads to an increase in the temperature of the gas. However, the kinetic energy of the gaseous molecules also changes during the process.

Kinetic energy of gaseous molecules:

The kinetic energy of gaseous molecules is related to their motion. When a gas absorbs heat, the molecules gain kinetic energy and start moving faster. This means that the average kinetic energy of the molecules increases. However, during an expansion, the molecules move farther apart from each other, and the collisions between them decrease. This leads to a decrease in the frequency of collisions, which, in turn, leads to a decrease in the kinetic energy of the molecules.

The number of molecules of the gas:

During an expansion, the number of molecules of the gas remains constant. This is because the amount of gas in the system is conserved during the process. As the gas expands, the density of the gas decreases, but the number of molecules remains the same.

Conclusion:

In summary, when a gas expands at a constant pressure by providing heat, the temperature increases, but the kinetic energy of the gaseous molecules decreases. The number of molecules of the gas remains constant during the process.

Answer

I think the answer is option A, because since pressure is maintained constant, temperature should increase on heating.
Kinetic energy=(3/2)RT, implies kinetic energy also increases upon heating.

Answer

I think option (b) is correct

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