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## Homework Statement

The intensity of radiation reaching the earth from the sun is 1350 W/m2. The earth's radius is 6.4 × 106 m. How big a force does this radiation exert on the Earth (Assume it is all absorbed)

## The Attempt at a Solution

F=AP=AI/c=2.3x10

_{9}N

That's my answer. Is that correct?

(The result in my material is 5.8x10

^{8}N)

And I want to ask one more question?

What is the difference between I or S

_{av}and S in calculation?

If we say the Sun delivers about 10000 W/m

^{2}of energy to the Earth's surface, so that is S

_{av}, right?

Then they told me to calculate the total power.

I see a book solved by telling P=S

_{av}A and another book was P

_{av}=S

_{av}A.

Which one was correct? Or was P

_{av}the same as P?

Then is this one P=SA.