What is the average thermal energy of a helium atom at room temperature (\(27^{\circ}\mathrm{C}\))?
1. | \(11 . 21 \times 10^{- 20} \text{J}\) | 2. | \(3 . 09 \times 10^{- 16} \text{J}\) |
3. | \( 6 . 21 \times 10^{- 21} \text{J} \) | 4. | \(5 . 97 \times 10^{- 19} \text{J}\) |