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Question

(a) What is solar constant ? What is the value of solar constant ?
(b) If the energy received by $$5 m^2$$ area in $$10$$ minutes is $$4200 \,kj$$, calculate the value of solar constant.


Solution

(a) The amount of solar energy received per second by one metre square area of the near earth space (exposed perpendicularly to the sun rays) at an average distance between the sun and the earth, is known as solar constant. Its value is $$1.4\, kJ/s/m^2$$. 
(b) Area, $$A=5m^2; time,t=10 rnin=600sec, E=4200 kJ$$. 
Solar constant $$=E/(Axt) $$
$$=4200/(5\times 600) $$
$$=1.4 kJ/s/m^2$$ 

Physics

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