Why Must the Sun's Rate of Fusion Gradually Rise Over

question 98

Multiple Choice

Why must the Sun's rate of fusion gradually rise over billions of years?

• A)The Sun becomes less efficient and must increase the rate of fusion to produce the same amount of energy.
• B)Fusion reactions decrease the overall number of particles in the core,causing the core to shrink,converting gravitational potential energy into thermal energy,and increasing the rate of fusion.
• C)The radiation produced by fusion reactions that is trapped in the core gradually raises the temperature,increasing the rate of fusion.
• D)The Sun gets heavier as it gets older,and the stronger inward pull of gravity increases the fusion rate.
• E)The rate of fusion is not rising;it is actually decreasing over time.

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