Correct option is A
The solar constant refers to the amount of solar radiation received per unit area at a specific distance from the Sun. It represents the average solar irradiance (power per unit area) at the outer boundary of Earth's atmosphere when Earth is at its mean distance from the Sun, roughly 93 million miles or 1 astronomical unit (AU). The solar constant is a critical parameter in solar physics and helps quantify the energy Earth receives from the Sun.
Key Points:
- The commonly accepted value for the solar constant is approximately 1361 watts per square meter (W/m²).
- To convert this value into joules per second (J/s), the unit conversion is as follows:
Solar Constant = 1361 W/m²
Hence, the solar constant is equivalent to 1361 J/s per square meter or 1.36 kJ/s.



