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 :

Question

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