Light with an energy flux of $$16W/cm2$$ falls on a non reflecting surface at normal incidence. If the surface has an area of $$20$$ $$cm2$$ , find the average force exerted on the surface during a $$30$$ minute time span.

Question

Light with an energy flux of $$16W/cm2$$  falls on a non reflecting surface at normal incidence. If the surface has an area of $$20$$ $$cm2$$  , find the average force exerted on the surface during a $$30$$ minute time span.

Infinity Learn · Accepted Answer

The total energy falling on the surface isU $$=$$ $$16$$×$$20$$×$$30$$×$$605.76$$×$$105J$$        The total momentum delivered (for$$ complete $$absorption) isp $$=$$ uc $$=$$ $$5.76$$×$$1053$$×$$1085.763$$×$$10$$−$$3=$$ $$1.92$$×$$10$$−$$3The$$ average force $$exerted=pt$$ $$=$$ $$1.92$$×$$10$$−$$30.18$$×$$104$$ $$=$$ $$10.66$$×$$10$$−$$7$$                                                     $$=1.06$$×$$10$$−$$6$$

Light with an energy flux of $16 W / c m^{2}$ falls on a non reflecting surface at normal incidence. If the surface has an area of $20 c m^{2}$ , find the average force exerted on the surface during a 30 minute time span.

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Light with an energy flux of 16W/cm2 falls on a non reflecting surface at normal incidence. If the surface has an area of 20 cm2 , find the average force exerted on the surface during a 30 minute time span.

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Light with an energy flux of $16 W / c m^{2}$ falls on a non reflecting surface at normal incidence. If the surface has an area of $20 c m^{2}$ , find the average force exerted on the surface during a 30 minute time span.