Your answer would be A. Halogens
A football field is about 91.44 meters long. If it takes a person 35 seconds to run its length, how fast were they running in me
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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