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If 2 .5 xx 10^(-6) N average force is ex...

If `2 .5 xx 10^(-6) N` average force is exerted by a light wave on a non-reflecting surface of `30 cm^(2)` area 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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