We have: Average Kinetic Energy(E) = 3/2 kT
Here, k (Boltzmann constant) = 1.38 × 10⁻²³
T (Temperature) = 300 K
Substitute their values into the expression:
E = 3/2 × 1.38 × 10⁻²³ × 300
E = 6.21 × 10⁻²¹ J
Finally, correct answer would be 6.21 × 10⁻²¹ J
Hope this helps!