The Sun delivers about 900 W/$m^2$of energy to the Earth’s surface at midday time at a place. The force exerted by the radiation on a shiny roof top of dimensions 10 m × 5 m is (assume that the roof top is a perfect reflector)

• A

  $3.0\times {10}^{-4} N$

• B

  $1.5 \times {10}^{-4} N$

• C

  $4.5 \times {10}^{-4} N$

• D

  $0.75\times {10}^{-3} N$