Which layer surrounding the stellar core transfers energy outward primarily by radiation?

Which layer surrounding the stellar core transfers energy outward primarily by radiation?

• A. Radiative zone
• B. Convective zone
• C. Photosphere
• D. Core

Answer: (A)

In stars, energy moves outward from the hot core through a sequence of layers, and the method of transport changes with conditions. The region directly surrounding the core is dominated by radiative transport, meaning energy is carried mainly by photons slowly diffusing through the dense, opaque matter. Photons are absorbed and re-emitted many times, effectively performing a random walk outward until the temperature gradient relaxes enough for convection to take over in the outer layers. This radiative zone sits between the inner core and the outer convective region. The photosphere is the visible surface where photons finally escape, not a transport channel, and the core is where the energy is produced, not where it is transported outward.

In stars, energy moves outward from the hot core through a sequence of layers, and the method of transport changes with conditions. The region directly surrounding the core is dominated by radiative transport, meaning energy is carried mainly by photons slowly diffusing through the dense, opaque matter. Photons are absorbed and re-emitted many times, effectively performing a random walk outward until the temperature gradient relaxes enough for convection to take over in the outer layers. This radiative zone sits between the inner core and the outer convective region. The photosphere is the visible surface where photons finally escape, not a transport channel, and the core is where the energy is produced, not where it is transported outward.