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.
B
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A) Changes in the Sun's energy output (irradiance) cannot explain the observed warming. B) The Sun's energy output (irradiance) tracks quite well with the observed warming trend. C) The Sun's energy output (irradiance) and Earth's global average temperature both vary in an 11-year cycle. D) Scientists have no way to explain the observed global warming trend.
Why are eclipsing binaries the rarest of the three types discussed?
What will be an ideal response?
The baryon having which of the following quark contents has electric charge -e?
A. csd B. dds C. uud D. bbc
A(n) ______ website structure works well for catalogs and other websites that use search features or dynamic content.
A. hierarchical B. webbed C. linear D. structured