Practicing Success

Target Exam

CUET

Subject

Physics

Chapter

Electromagnetic Waves

Question:

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:

Options:

1.4 × 104

2.8 × 105

4.2 × 106

5.6 × 107

Correct Answer:

5.6 × 107

Explanation:

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