question_answer

Light with an energy flux of \[\text{18W}/\text{c}{{\text{m}}^{\text{2}}}\]falls on a non-reflecting surface at normal incidence, The surface has an area of\[\text{2}0\text{ c}{{\text{m}}^{\text{2}}}\], then the total momentum delivered on the surface during a  span of 30 mm is    

A)                           \[2.16\times {{10}^{-3}}kg-m/s\]

B) \[1.52\times {{10}^{-5}}kg-m/s\]

C)  \[8.31\times {{10}^{-8}}kg-m/s\]

D) \[18.2\times {{10}^{-6}}kg-m/s\]