Question

The Stefan-Boltzmann Law says that the total energy radiated in 1 second from 1 square meter of an object is given by the equation E = σ T4 (the energy is expressed in Joules, see Chapter 7 of the book for the value of σ). The average temperature of the Sun's surface is 5,800 K, but a hotter spot can be about 6000 K and a sunspot (which is a colder spot) is about 4000 K. Fractionally, how much less energy, in percent, is radiated in 1 second from 1 square meter of a sunspot than from 1 square meter of the hotter spot in the sun's photosphere?

Answer 1