Question

which process produces the energy radiated by the star when it becomes a main sequence star? radioactive decay conduction nuclear fusion convection

Explanation:

Main - sequence stars produce energy through nuclear fusion. In the core of a main - sequence star, hydrogen nuclei fuse to form helium nuclei. This process releases a large amount of energy in the form of light and heat. Radioactive decay is a process in which unstable atomic nuclei lose energy by emitting radiation, which is not the main energy - producing process in stars. Conduction is the transfer of heat through direct contact of particles, and convection is the transfer of heat through the movement of fluids. These are not the primary energy - generating mechanisms in main - sequence stars.

Answer:

nuclear fusion