For our Sun, what is the inner radial boundary of the radiative zone in solar radii?
Answer
Roughly $0.25$ solar radii ($R_ ext{odot}$)
The physical location of the radiative zone within a star like the Sun is defined by specific radial boundaries relative to the star's total radius ($R_ ext{odot}$). Fusion reactions dominate energy generation only in the core, which is located inside this zone. The radiative zone begins where fusion effectively stops driving the energy output, starting from an approximate radius of $0.25 R_ ext{odot}$. This region extends outward until conditions change enough to permit convective transport, marking the inner edge of the subsequent layer.
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