Average momentum density (momentum per unit volume):
I is the intensity and c is the speed of light.
In the 25-ft Space Simulator facility at NASA’s Jet Propulsion Laboratory, a bank of overhead arc lamps can produce light of intensity 2500 W/m2 at the floor of the facility. (This simulates the intensity of sunlight near the planet Venus.)
Find the average momentum density (momentum per unit volume) in the light at the floor.
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