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The intensity of direct sunlight before it passes through the earth's atmosphere is $\;1.4 KW/m^2\;.$ If it is completely obsorved than the corresponding radiation pressure :

$(a)\;4.7 \times10^{-6} Nm^{-2}\qquad(b)\;4.7 \times10^{-7} Nm^{-2}\qquad(c)\;4.7 \times10^{-5} Nm^{-2}\qquad(d)\;4.7 \times10^{-8} Nm^{-2}$

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Answer : (a) $\;4.7 \times10^{-6} Nm^{-2}$
Explanation :
For completely absorbing surface


answered Feb 21, 2014 by yamini.v
edited Nov 11, 2014 by thagee.vedartham

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