Question: If the Sun were to become cooler (without changing its radius), the energy density at the surface would decrease according to Equation 8-56. Suppose the

If the Sun were to become cooler (without changing its radius), the energy density at the surface would decrease according to Equation 8-56. Suppose the Sun’s temperature were to decrease by 5 percent. Compute the fractional change in the rate at which solar energy arrives at Earth. (Assume that the Sun’s surface is in equilibrium and radiates as a blackbody.)

u(E) dE= Egph (E) fph (E) dE V 8TE DE ch(e/kT-1) 8-56

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