If a gas expands at constant temperature, it indicates that

Options

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

Answer

A

Explanation

The average translational KE of one molecule of an ideal gas is as follows :
`K_(t)=(KE)/(N_(A))=(3//2RT)/(N_(A))=(3)/(2)KT`
when `R//N_(A)`= Boltzmann constant
`"i.e., "E_(t) prop T`
Thus, at constant temperature KE of molecules remains same.