Question

Which of the following is the most reasonable explanation for a drop in temperature of gas?

Answer 1

B) a decrease in the average kinetic energy of the gas particles 

Answer 2

Answer: The correct answer is option B.

Explanation:

Average kinetic energy of the gas molecule is given by relation:

$E_K=\frac{3}{2}\frac{R}{N_A}\times T$

$N_A$ = Avogadro Number

T = Temperature of the gas in Kelvins.

R = Universal gas constant

$E_K\propto T$

With increase in temperature the kinetic energy of the gas molecule increases and vice-versa.

So, according to the question the explanation for a drop in temperature of the gas is decrease in average kinetic energy of the gas molecules.

Hence, the correct answer is option B.