A flashlight of intensity 9 W/`cm^(2)` illuminates a perfectly reflective surface of area `300cm^(2)`. The average force exerted on the surface due to the incident light photons is

A light beam of intensity 20 W//cm^(2) is incident normally on a perfectly reflecting surface of sides 25 cm x 15 cm. The momentum imparted to the surface by the light per second is

Light with enregy flux of 18 W cm^(-2) ,find the average force the surface has an area of 20 cm^2 ,find the average force exerted on the surface during a 30 minutes time span.

Light with an energy flux of 25xx10^4 Wm^-2 falls on a perfectly reflecting surface at normal incidenc .If the surface area 15cm^2 ,the average force exerted on the surface is

Light with an energy flux of 18W//cm^(2) falls on a non-reflecting surface at normal incidence. The pressure exerted on the surface is

Light with an energy flux of 18W//cm^(2) falls on a non-reflecting surface at normal incidence. The pressure exerted on the surface is

Light with an enargy flux of 25xx10^(4) Wm^(-2) falls on a perfectly reflecting surface at normal incidence. If the surface area is 15 cm^(2) , the average force exerted on the surface is

Light with an enargy flux of 25xx10^(4) Wm^(-2) falls on a perfectly reflecting surface at normal incidence. If the surface area is 15 cm^(2) , the average force exerted on the surface is