Question

The parameter that remains the same for molecules of all gases at a given temperature is :

• A. kinetic energy
• B. momentum
• C. mass
• D. speed

Answer 1

The Correct Option is A

The kinetic energy of gas molecules at a given temperature is given by:

\[ KE = \frac{f}{2}kT \]

where \( f \) is the degrees of freedom and \( kT \) is the thermal energy term.

This is a conceptual fact based on the equipartition theorem, which states that all gases at a given temperature have the same average kinetic energy per molecule.