The sun radiates electromagnetic energy at the rate of 3.9 × 1026 W. Its radius is 6.96 × 108 m. The intensity of sun light at the solar surface will be:
Answer & explanation
Correct answer: option 4
Isurface = $\frac{P}{A}=\frac{3.9 \times 10^{26}}{4 \times 3.14 \times(6.96)^2 \times 10^{16}}$ = 5.6 × 107 W/m2