Answer:
Solar constant - Heat flux density.
Step-by-step explanation:
The solar constant (GSC) is a flux density measuring mean solar electromagnetic radiation (solar irradiance) per unit area. It is also defined as the rate at which solar radiation is received on a unit surface that is perpendicular to the direction of incident radiation just outside Earth's atmosphere at Earth's mean distance from the Sun; equal to 2 cal/cm^2.min.
He can choose as follows:
Only 1 entree: 3 groups
Only 2 entrees: 3 groups
All the 3 entrees: 1 group
total groups of entrees= 3 + 3 + 1 = 7 groups
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Answer:
A={x:x is a multiple of five }