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Question

Find the radiation pressure of solar radiation on the surface of earth. Solar constant is 1.4kWm−2

A
4.7×105Pa
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B
4.7×106Pa
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C
2.37×106Pa
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D
9.4×106Pa
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Solution

The correct option is A 4.7×10−6PaMETHOD-1:Pressureabsorbed=EfcEf= energy flux, C= Speed of lightPressureabsorbed=1.4×10003×108=4.66×10−6PaMETHOD-2: (checking the unit,if formula is not remembered)We know that:Power=force×velocity-----(1)Pressure=forcearea------(2)Force=powervelocity=1.4×10003×108=4.66×10−6newtonPut in equation (2)Pressureabsorbed=4.66×10−6Nm2=4.66×10−6Pa

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