Question

The average kinetic energy of a monoatomic gas molecule kept at temperature $27^{\circ}C$ is
(Boltzmann constant $k = 1.3 \times 10^{-23} \,JK^{-1}$)

• A. $5.85 \times 10^{-21}\, J$
• B. $4.12 \times 10^{-21} \,J$
• C. $3.75 \times 10^{-21} \,J$
• D. $2.85 \times 10^{-21} \,J$
• E. $ 7.55 \times 10^{-2}\,J$

Answer 1

Answer: (A)

$K . E=\frac{3}{2} k_{\beta} \cdot T=\frac{3}{2} \times 1.39 \times 10^{-23} \times 300\, J$