How big is the radiative zone of the Sun?
approximately 0.25 to 0.7 solar radii
Just outside the Inner Core of the sun at a distance approximately 0.25 to 0.7 solar radii lies the Radiative Zone. This zone radiates energy through the process of photon emission and capture by the hydrogen and helium ions.
What is the difference between the convection and radiation zone?
Conduction usually occurs in solids, through molecular collision. Convection occurs in fluids by mass motion of molecules in the same direction. In contrast, Radiation takes place through the vacuum of space and does not heat up the intervening medium.
What percent of the Sun is the radiative zone?
The radiative zone of the sun starts at about 25 percent of the radius, and extends to about 70 percent of the radius. In this broad zone, heat from the core cools dramatically, from between seven million K to two million K. In the radiative zone, energy is transferred by a process called thermal radiation.
What are the radiative and convective zones of the Sun?
In the Sun, the region between the solar core at 0.2 of the Sun’s radius and the outer convection zone at 0.71 of the Sun’s radius is referred to as the radiation zone, although the core is also a radiative region. The convection zone and the radiation zone are divided by the tachocline, another part of the Sun.
What does the convective zone of the Sun do?
The convection zone is the outer-most layer of the interior. It extends from a depth of 200,000 km up to the visible surface of the Sun. Energy is transported by convection in this region. The surface of the convection zone is where light (photons) is created.
What happens in the convective zone?
A region of turbulent plasma between a star’s core and its visible photosphere at the surface, through which energy is transferred by convection. In the convection zone, hot plasma rises, cools as it nears the surface, and falls to be heated and rise again.
What is the main difference between conduction and convection?
In conduction, heat transfer takes place between objects by direct contact. In convection, the heat transfer takes within the fluid. In radiation, heat transfer occurs through electromagnetic waves without involving particles. The heat transfer takes place due to the difference in temperature.
What is the function of the radiative and convection zones?
Energy is generated in the core, the innermost 25%. This energy diffuses outward by radiation (mostly gamma-rays and x-rays) through the radiative zone and by convective fluid flows (boiling motion) through the convection zone, the outermost 30%.
Is radiative zone hotter than convective zone?
How hot is each one of the layers of the sun? The centre of the Sun: about 15 million kelvin (K). Radiative Zone: Temperature falls from about 7 million to about 2 million K across this zone. Convection Zone: drops from 2 million K to 5800K in this zone.
Why do massive stars have convective cores?
Because of the general tendency of the interior temperature of main sequence stars to increase with mass, stars of over two solar mass are chiefly powered by the CNO cycle(s) rather than the pp cycle(s). This, plus the increasing fraction of pressure due to radiation, makes their cores convective.
What happens at the convective zone of the Sun?
In the convective zone, the temperatures are cool enough—under 1,800,000 degrees Fahrenheit (1,000,000 degrees Kelvin)—that the atoms in the plasma there can absorb the photons coming outward from the Sun’s radiative zone. The plasma gets very hot, and begins to rise upward out of the Sun.
Which statement correctly compares the difference between conduction and convection in a classroom?
Which statement correctly compares the difference between conduction and convection in common classroom settings? Convection can only occur in liquids and gases, while conduction can occur in solids, liquids, and gases.