Question

If a gas expands at constant temperature, it
indicates that :
(a) kinetic energy of molecules decreases
(b) pressure of the gas increases
(c) kinetic energy of molecules remains the
same
(d) number of the molecules of gas increases

Answer 1

Answer:

c) kinetic energy of molecules remains the same.

Answer 2

(c) kinetic energy of molecules remains the same

Explanation:

We know that KE = 3/2 RT

So KE ∝ T.

Kinetic energy is directly proportional to temperature. Kinetic energy will increase if temperature is increased; and Kinetic energy will decrease if temperature is decreased. So if temperature is kept constant, there will be no change in the kinetic energy.

Hence option C is the correct answer.