Home NEET 2020 OPTICS PHOTON & ELECTRON Previous year Questions LIGHT WITH AN AVERAGE FLUX OF 20 W/m^2 FALLS ON A NON-REFLECTING SURFACE AT NORMAL INCIDENCE HAVING SURFACE AREA 20 m^2. THE ENERGY RECEIVED BY THE SURFACE DURING TIME SPAN OF 1 MINUTE IS :

LIGHT WITH AN AVERAGE FLUX OF 20 W/m^2 FALLS ON A NON-REFLECTING SURFACE AT NORMAL INCIDENCE HAVING SURFACE AREA 20 m^2. THE ENERGY RECEIVED BY THE SURFACE DURING TIME SPAN OF 1 MINUTE IS :

$(a) 10*10^{3}J$ $(b) 12*10^{3}J$ $(c) 24*10^{3}J$ $(d) 48*10^{3}J$

According to the definition

$Intesity=\frac{Energy}{Area*Time}$

$Energy=Intesity*Area*Time$

$Energy=20*20*60$

The energy received by the surface during 1 minute is

$Energy=24*10^{3}J$

Milan Tomic

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