Once Carbon Begins Burning in the Core of a High-Mass

question 10

Multiple Choice

Once carbon begins burning in the core of a high-mass star,the outer layers begin to fall inward,driving up the fusion rates and speeding up the star's evolution primarily because:

• A) the number of particles in the core is decreasing, which now take up less space.
• B) most of the energy is now carried away from the core by escaping neutrinos, which have few if any obstacles to leaving the star.
• C) carbon is a more stable element that appears to settle the star.
• D) the light given off by the fusion of carbon is a different wavelength than that given off by previous reactions, so the radiation pressure is much smaller.

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