Suppose that your data shows that saturn orbits every 29. 5 years. To the nearest hundredth of an au, how far is saturn from the
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Intensity of sunlight at given position is defined as power received per unit area
so here we can say
area on which photons are received is given as
now we can find the power received due to sunlight
now we can say this power is due to photons that strikes on surface of earth
so here we can say
given here that
so it will strike 2.47 * 10^18 photons on given area per second