Physics · JEE | Nuclei

What is the approximate temperature required for two protons in a proton gas to have average kinetic energy sufficient to overcome the Coulomb barrier of roughly \( 400\text{ keV} \)?

1. A
   \( 1.5 \times 10^7\text{ K} \)
2. B
   \( 3 \times 10^9\text{ K} \)
3. C
   \( 10^8\text{ K} \)
4. D
   \( 5 \times 10^9\text{ K} \)