Radiation from the Sun reaching Earth (just outside the atmosphere) has an inten

Question

Radiation from the Sun reaching Earth (just outside the atmosphere) has an intensity of 1400 W/m^2. What would the intensity be at Venus? (See Appendix B, A-3) 2.68 times 10^3 W/m^2 Assuming that Earth (and its atmosphere) behaves like a flat disk perpendicular to the Sun's rays and that all the incident energy is absorbed, calculate the force on Earth due to radiation pressure. 5.95 times 10^8 N What would it be for Venus? What is the force on the Earth due to the sun's gravitational attraction? 3.55 times 10^22 N What is it for Venus? 5.53 times 10^22 N

Explanation / Answer

Radition intensity I=2680 W/m2

Radius of venus=6.052*106 m

Pressure due to radiation,

P=I/c=2680/(3*108)=8.93*10-6 N/m2

Force at venus

F=PA=8.93*10-6(3.14*(6.052*106)2=1.03*109 N

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