Light with energy flux of $18{\text{W/cm}}^2$ falls on a non-reflecting surface, of area $20{\text{cm}}^2$, at normal incidence. The momentum delivered in $30\text{minute}$ is -

Q. Light with an energy flux of $18W/c{m}^2$ falls on a non-reflecting surface at normal incidence. The surface has an area of $20c{m}^2$, then the total momentum delivered on the surface during a span of $30$ minuts is

Q. Light with an energy flux of $9Wc{m}^{-2}$ falls on a non-reflecting surface at normal incidence. If the surface has an area of $20c{m}^2$. The total momentum delivered for complete absorption in one hour is:

Q. Light with energy flux of 18$w/{cm}^2$ falls on a non reflecting surface of area 20${cm}^2$ at normal incidence the momentum delivered in $30$ minutes ise

Q. Light with an energy flux of $20W/c{m}^2$ falls on a non-reflecting surface at normal incidence. If the surface has an area of $30c{m}^2,$ the total momentum delivered (for complete absorption) for $30$ minutes is:

Q. Light with an energy flux of $18W/c{m}^2$ falls on a non-reflecting surface at normal incidence. The pressure exerted on the surface is: