Question

What is the total energy radiated, in $Jmi{n}^{-1}$, by the sun to the universe? Distance of the sun from the earth is $1.49\times {10}^{11}m$

• A. $2.3444\times {10}^{28}Jmi{n}^{-1}$
• B. $2.33\times {10}^{24}Jmi{n}^{-1}$
• C. $2.34\times {10}^{20}Jmi{n}^{-1}$
• D. none of these

Answer 1

The correct option is A $2.3444\times {10}^{28}Jmi{n}^{-1}$

Energy radiated by the sun $P=2$ cal $c{m}^{-2}mi{n}^{-1}=8.4$ $Jc{m}^{-2}mi{n}^{-1}$

Given : $r=1.49\times {10}^{13}$ cm

Thus total energy radiated by sum $P_s=P\times 4\pi r^2$

$\therefore$ $P_s=8.4\times 4\pi (1.49\times {10}^{13}{)}^2=2.344\times {10}^{28}$ $Jmi{n}^{-1}$