The Sun radiates energy at the rate of 3.85 ∙ 1026 W.
a) At what rate, in kilograms per second, is the Sun's mass converted into energy?
b) Why is this result different from the rate calculated in Example 40.6: 6.02∙1011 kg of protons being converted into helium each second?
c) Assuming that the current mass of the Sun is 1.99∙1030 kg and that it has radiated at the same rate for its entire lifetime of 4.50∙109 yr, what percentage of the Sun's mass has been converted into energy during its entire lifetime?