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Did you know?
Water is the only substance found naturally in all three states on Earth's surface.
Did you know?
Water is the only substance found naturally in all three states on Earth's surface.
Light with an energy flux of Wm falls on a perfectly reflecting surface at normal incidence. If the surface area is cm the average force exerted on the surface is
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To solve this problem, we need to calculate the force exerted by light on a perfectly reflecting surface.The force exerted by light on a surface is given by the change in momentum per unit time. For a perfectly reflecting surface,the change in momentum is twice the momentum of the incident light.The momentum of light is related to its energy flux by the equation:
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