The sum radiates electromagnetic energy at the rate of 4.0 × 1026 W. Its radius is 7 × 108 m. The intensity of sun light at the solar surface is

Question

The sum radiates electromagnetic energy at the rate of 4.0 × 1026 W. Its radius is 7 × 108 m. The intensity of sun light at the solar surface is (A) 4.54 × 108 Wm -2 (B) 5.09 × 10-8 Wm -2 (C) 3.00 × 108 Wm -2 (D) 108 Wm -2

Tardigrade Admin · Accepted Answer

As, Intensity =( text Power / text Arca ) =(4.0 × 1026/4 π r2) =(4 × 1026/4 × (22)7 ×(7 × 108)2) =4.54 × 108 Wm -2

Q. The sum radiates electromagnetic energy at the rate of $4.0 \times 1 0^{26} W$ . Its radius is $7 \times 1 0^{8} m$ . The intensity of sun light at the solar surface is

$4.54 \times 1 0^{8} W m^{- 2}$

$5.09 \times 1 0^{- 8} W m^{- 2}$

$3.00 \times 1 0^{8} W m^{- 2}$

$1 0^{8} W m^{- 2}$

As, Intensity $= \frac{Power}{Arca}$
$= \frac{4.0 \times 1 0 ^{26}}{4 π r ^{2}}$
$= \frac{4 \times 1 0 ^{26}}{4 \times \frac{22}{7} \times ( 7 \times 1 0 ^{8} ) ^{2}}$
$= 4.54 \times 1 0^{8} W m^{- 2}$

Q. The sum radiates electromagnetic energy at the rate of 4.0×1026W. Its radius is 7×108m. The intensity of sun light at the solar surface is

4.54×108Wm−2

5.09×10−8Wm−2

3.00×108Wm−2

108Wm−2