Question

What is the standard value of solar constant adopted by World Radiation Centre?
1. 1192 W/m²
2. 1084 W/m²
3. 1927 W/m²
4. 1367 W/m²

Answer 1

Correct Answer - Option 4 : 1367 W/m²

Explanation:

Solar constant:

• Solar constant, the total radiation energy received from the sun per unit of time per unit of area on a theoretical surface perpendicular to the sun’s rays and at earth’s mean distance from the sun. It is most accurately measured from satellites where atmospheric effects are absent.
• The value of the constant is approximately 1.366 kW/m² or 1367 W/m².
• The “constant” is fairly constant, increasing by only 0.2% at the peak of each 11-year solar cycle.