If 2.5×10−6 N average force is exerted by a light wave on a non-reflecting surface of area 30 cm2 during 40 minutes of time span, the energy flux of light just before it falls on the surface is ______ W/cm2.(Round off to the nearest integer)(Assume complete absorption and normal incidence conditions are there)

If 2.5×10−6 N average force is exerted by a light wave on a non-ref

1.	If 2.5×10−6 N average force is exerted by a light wave on a non-reflecting surface of area 30 cm2 during 40 minutes of time span, the energy flux of light just before it falls on the surface is ______ W/cm2.(Round off to the nearest integer)(Assume complete absorption and normal incidence conditions are there)
Answer» If $2.5 \times 10^{- 6} N$ average force is exerted by a light wave on a non-reflecting surface of area $30 {cm}^{2}$ during $40$ minutes of time span, the energy flux of light just before it falls on the surface is ______ ${W/cm}^{2}$ . $($ Round off to the nearest integer $)$ $($ Assume complete absorption and normal incidence conditions are there $)$

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