[" Light with an energy flux of "40l" s on a non-refleting surface.If the surface has an area of "200ms^(2)" ,find the "],[" average force extred on the surface do min time span."],[qquad [0.27times10^(5)N],[0.27times10^(5)N],[0.35times10^(-7)N],[0.28times10^(-7)N]]

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.

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 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 enrgy flux of 9 xx 10^5 W m^(-2) falls of a non - refleting surface at normal incidence.If trhe surface has an area of 50 cm^2 ,find average force exerted on the surface during an intervl of 10 minutes.How will the result get modified ,if the surface is a perfect reflector?