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14. Sources of Energy
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Q25 of 141 Page 14

How much solar energy will be received by 1m2 area in one hour, if the solar constant were 1.4 kilowatt per square metre?

One hour = 60 × 60 = 3600 s
Solar constant = 1.4 kW/m2 = 1.4 kJ/s/m2
i.e., in 1s, 1m2 area receives energy = 1.4 kJ
So, in 1 hour, i.e., in 3600 s, 1 m2 area receive energy = 1.4 × 3600 kJ = 5040 kJ.

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23 Name any two renewable sources of energy. 24 Why is the use of wood as a fuel not advised although forests can be replenished? 26 What is the range of the wavelength of electromagnetic waves that constitutes visible radiation? 27 Name the component of sunlight that mainly carries heat with it.
Questions · 141
14. Sources of Energy
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