Question

If a gas expands at constant temperature indicates that:

• A. kinetic energy of molecules decreases
• B. pressure of the gas increases
• C. kinetic energy of molecules remains as same
• D. number of the molecules of gas increase

Answer 1

Answer: (C)

kinetic energy of molecules remains as same

If a gas expands at constant temperature , it indicates that Kinetic energy of molecules remains as same.
Average kinetic energy of a gas molecule $=\frac{3}{2}kT$
At constant temperature, the average kinetic energy of a gas molecule is constant.