Question

Consider an iron cube, an aluminum cube, and a balloon filled with helium gas. If all were at the same temperature, how would the average kinetic energy of the particles compare?
A. The average kinetic energy of the iron particles would be greatest.
B. The average kinetic energy of the helium particles would be greatest.
C. The average kinetic energy of the aluminum particles would be greatest.
D. There would be no difference in the average kinetic energies.

Answer 1

Answer : The correct option is, (D) There would be no difference in the average kinetic energies.

Explanation :

Average kinetic energy : According to the kinetic theory of gases, an average kinetic energy of gas molecule is directly proportional to the temperature of gas molecule.

Formula of average kinetic energy is,

$K.E=\frac{3}{2}\frac{RT}{N_A}$

where,

K.E = average kinetic energy of gas molecule

R = gas constant

$N_A$ = Avogadro's number

T = temperature of gas molecule

The average kinetic energy depend only on the temperature. If the temperature will be same then there would be no difference in the average kinetic energies.

Hence, the correct option is, (D) There would be no difference in the average kinetic energies.

Answer 2

The answer is:  [D]:
_______________________________________________________
There would be no different in the average kinetic energies.
________________________________________________________