Light is incident normally on a completely absorbing surface with an energy flux of `25 Wcm^(-2)` If the surface has an area of `25 cm^(2)` the momentum transferred to the surface in 40 min time duration will be:

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.

A collimated beam of light of flux density 30kWm^(-2) is incident normally on 100mm^(2) completely absorbing screen. If P is the pressure exerted on the screen and trianglep is the momentum transferred to the screen during a 1000 s interval, then

Light with an energy flux of 18 W//cm^(2) falls on a nonreflecting surface at normal incidence. If the surface has an area of 20 cm^(2) , find the average force exerted on the surface during a 30 minute time span.

Light with an energy flux of 18 W//cm^(2) falls on a nonreflecting surface at normal incidence. If the surface has an area of 20 cm^(2) , find the average force exerted on the surface during a 30 minute time span.

Light with an energy flux of 40W//cm^(2) falls on a non-reflecting surface at normal incidence. If the surface has an area of 20cm^(2) , find the average force exerted on the surface during a 30min time span.