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Question

Find the radiation pressure of solar radiation on the surface of earth. Solar constant is 1.4kWm2

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 4.7×106Pa
METHOD-1:
Pressureabsorbed=Efc
Ef= energy flux, C= Speed of light

Pressureabsorbed=1.4×10003×108=4.66×106Pa

METHOD-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=4.66×106newton

Put in equation (2)
Pressureabsorbed=4.66×106Nm2=4.66×106Pa

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