Practicing Success

Target Exam

CUET

Subject

Physics

Chapter

Electromagnetic Waves

Question:

The sun delivers $10^3 W/m^2$ of electromagnetic flux to the earth's surface.

The sun delivers $10^3 W/m^2$ of electromagnetic flux to the earth's surface. The total power that is incident on a roof of dimensions 8m x 20m, will be:

Options:

6.4 x 103W      

 3.4 x 104W

1.6 x 105W

None of these

Correct Answer:

1.6 x 105W

Explanation:

$ \text{ Total power is } P = IA = 10^3 \times 160 W = 1.6\times 10^5W$