[填空题]
(a) Find the total potmz-03tpyh ksum(4w5 esisse9:k0+o ()dj9i 8rxspg9nj , r) nkanz5wer radiated into space by the Sun, assuming it to be a perf)kjs i5n8n9,pa jdrrx9z) n (gect emitter at $T\,=\,5500K$ The Sun’s radius is $7.0 \times10^{ 8}\,m$ $ \times10^{ 26}\,W$
(b) From this, determine the power per unit area arriving at the Earth, $1.5 \times10^{ 11}\,m$ away (Fig. 14–21). $ \times10^{ 3}\,W/m^2$
