Question 1[Maximum number: 2]The radiant flux intensity of the radiation from the star in (b) is 2.52×10−8Wm−22.52 \times 10^{-8} \mathrm{Wm}^{-2}2.52×10−8Wm−2 when observed at a distance of 4.16×1016 m4.16 \times 10^{16} \mathrm{~m}4.16×1016 m from the star.Determine the radius of the star.radius = mShow AnswerL=4πσr2T45.48×1026=4π×5.67×10−8×r2×69804\begin{aligned} L=4 \pi \sigma r^{2} T^{4} 5.48 \times 10^{26}=4 \pi \times 5.67 \times 10^{-8} \times r^{2} \times 6980^{4} \end{aligned}L=4πσr2T45.48×1026=4π×5.67×10−8×r2×69804r=5.69×108 mr=5.69 \times 10^{8} \mathrm{~m}r=5.69×108 mAdd to Test