Problem

1. State the Stefan–Boltzmann law for power being radiated from a hot object. 2. The Sun has a surface temperature of about 5770 K and a radius of

6.96 \times 10^8

m. If we assume that the Sun behaves like a black body (i.e. its emissivity is one) calculate the total power being radiated into space by the Sun. 3. The Earth orbits the Sun at a mean distance of

1.496 \times 10^{11}

m. Calculate the solar power per square metre incident on the upper atmosphere of the Earth.

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