Light with an energy flux of 25 $ \times $ 104 W m$-$2 falls on a perfectly reflecting surface at normal incidence. If the surface area is 15 cm2, the average force exerted on the surface is

Question

Light with an energy flux of 25 $ \times $ 10⁴ W m^$-$2 falls on a perfectly reflecting surface at normal incidence. If the surface area is 15 cm², the average force exerted on the surface is

1.25 $ \times $ 10^$-$6 N

2.50 $ \times $ 10^$-$6 N

1.20 $ \times $ 10^$-$6 N

3.0 $ \times $ 10^$-$6 N

Solution

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