Question

How much solar energy will be received by 125 meter square area on earth’s surface in eight hours if the solar constant is 1.4 kilowatt per square meter?

• A.
  $5.04\times {10}^{6}J$
• B.
  $5.04\times {10}^{9}J$
• C.
  $1.008\times {10}^{8}J$
• D.
  $2.52\times {10}^{10}J$

Answer 1

The correct option is B

$5.04\times {10}^{9}J$
$Area=125m^2$
$\text{Solar constant = 1.4 kW}/m^2=1.4\times {10}^{3}W/m^2,Timet=8hours=8\times 60\times 60seconds$

$\text{Solar energy}=\text{Solar constant}\times \text{Area}\times Time=1.4\times {10}^3\times 125\times 8\times 60\times 60=5.04\times {10}^{9}J$

Hence, the correct answer is option (b).