1. how much solar energy will be recieved by 1m² area in one hour if the solar constant be 1.4 KW/m²?

2. if the by 5m²area in 10 minutes is 4200 Kj calculate the value of solar constant?

1-

From the solar constant we deduce that

1.4 kW of power is incident upon every 1m² of area.

i.e the total energy incident in 1 hr over an area of 1 m² will be = 1.4 kW x 1 hr

(Since P=E/t or E=P x t)

Hence,energy = 1.4 kWh

2-

E = 4200 kJ

t = 10 min = 600 sec

P = E/t = 7 kJ/sec

Area = 5 m²

P/A = 7/5 = 1.4 kJ/sec m²

This is the value of the solar constant.

This means that 1.4 kJ of solar energy reaches the surface of the earth in 1 second over an area of 1m².